UpToDate Medical Calculators

ALLERGY AND IMMUNOLOGY CALCULATORS

Medical Equations

• Calculator: Absolute eosinophil count

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

ANESTHESIOLOGY CALCULATORS

Clinical Criteria

• Calculator: APACHE II scoring system by admission diagnosis in adults

• Calculator: ARISCAT (Canet) preoperative pulmonary risk index in adults

• Calculator: CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale in adults

• Calculator: Child Pugh score for severity of liver disease in adults (SI units)*

• Calculator: Child Pugh score for severity of liver disease in adults (conventional units)*

• Calculator: Clinical indicators for malignant hyperthermia in adults (conventional and SI units)

• Calculator: Enhanced STOP-Bang screening questionnaire for obstructive sleep apnea (OSA) in adults

Medical Equations

• Calculator: Body mass index (BMI; Quetelet's index) in adults

• Calculator: Body surface area (BSA) (Mosteller, square root method) in children and adults

• Calculator: Body surface area (BSA) in adults (Du Bois method)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: Ideal body weight and adjusted body weight for adults

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

CARDIOVASCULAR MEDICINE CALCULATORS

Clinical Criteria

• Calculator: CHA2DS2-VASc risk stratification score for estimation of stroke risk for nonvalvular atrial fibrillation in adults

• Calculator: Cardiovascular risk assessment (10-year, general cardiovascular disease, females: Framingham, 2008 paper)

• Calculator: Cardiovascular risk assessment (10-year, general cardiovascular disease, males: Framingham, 2008 paper)

• Calculator: Cardiovascular risk assessment in adults (10-year, ACC/AHA 2013) (Patient education)

• Calculator: Clinical characteristics comprising the HAS-BLED bleeding risk score in adults

• Calculator: Embolic risk (ER) French score in infective endocarditis in adults

• Calculator: Probability of heart failure with preserved ejection fraction (H2FPEF score) in adults with dyspnea

• Calculator: Thrombolysis in Myocardial Infarction (TIMI) score for ST elevation MI in adults

• Calculator: Thrombolysis in Myocardial Infarction (TIMI) score for unstable angina or non-ST elevation MI in adults

Medical Equations

• Calculator: Cardiac output in adults (conventional and SI units)

• Calculator: Cardiovascular risk assessment in adults (10-year, ACC/AHA 2013) (conventional and SI units)

• Calculator: Cardiovascular risk assessment in adults (10-year, MESA 2015, with or without CAC score) (conventional and SI units)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Fractional excretion of phosphate (FePO4) (conventional and SI units)

• Calculator: Friedewald Equation for Low Density Lipoprotein (LDL-C) (SI units)*

• Calculator: Friedewald Equation for Low Density Lipoprotein (LDL-C) (conventional units)*

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Pulmonary vascular resistance (PVR) and pulmonary vascular resistance index (PVRI) in adults and children

• Calculator: QT interval correction (ECG) in adults and children

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Systemic vascular resistance in adults

DERMATOLOGY CALCULATORS

Clinical Criteria

• Calculator: Pressure ulcer risk stratification (Braden score) in adults

Medical Equations

• Calculator: Body mass index (BMI) for adults (Metric, Patient education)

• Calculator: Body mass index (BMI) for adults (Patient education)

• Calculator: Body mass index (BMI; Quetelet's index) in adults

• Calculator: Body surface area (BSA) (Mosteller, square root method) in children and adults

• Calculator: Body surface area (BSA) in adults (Du Bois method)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: Creatinine clearance (measured) in adults and children age 1 month and older

• Calculator: Creatinine clearance estimate by Cockcroft-Gault equation in adults and older adolescents (age ≥16 years) (SI units)*

• Calculator: Creatinine clearance estimate by Cockcroft-Gault equation in adults and older adolescents (age ≥16 years) (conventional units)*

• Calculator: Ideal body weight and adjusted body weight for adults

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Post-test probability from likelihood ratios and multiple test results

• Calculator: Post-test probability from pre-test probability, sensitivity, and specificity

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

EMERGENCY MEDICINE (ADULT AND PEDIATRIC) CALCULATORS

Clinical Criteria

• Calculator: Clinical Opioid Withdrawal Scale (COWS) for adults and adolescents

• Calculator: Pulmonary Embolism Rule-Out Criteria (PERC) rule

• Calculator: Sequential Organ Failure Assessment (Quick) qSOFA score in adults

Medical Equations

• Calculator: Adult burn injury fluid resuscitation (Parkland crystalloid estimate)

• Calculator: Blood ethanol concentration estimation

• Calculator: Burn injury fluid resuscitation (modified Brooke crystalloid estimate) in adults

• Calculator: Endotracheal tube size for children (1 to 8 years)

• Calculator: Ideal body weight and adjusted body weight for adults

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

ENDOCRINOLOGY AND DIABETES CALCULATORS

Clinical Criteria

• Calculator: Thyroid Imaging Reporting and Data System (TI-RADS) with guidance on FNA of thyroid nodules in adults

Medical Equations

• Calculator: Body mass index (BMI) for adults (Metric, Patient education)

• Calculator: Body mass index (BMI) for adults (Patient education)

• Calculator: Body mass index (BMI; Quetelet's index) in adults

• Calculator: Calcium correction in hypoalbuminemia in adults and children ≥1 year (SI units)*

• Calculator: Calcium correction in hypoalbuminemia in adults and children ≥1 year (conventional units)*

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conversion of hemoglobin A1C from percent to mmol/mol and estimation of corresponding average glucose (conventional and SI units)

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Plasma sodium concentration correction for hyperglycemia in adults (conventional and SI units)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

FAMILY MEDICINE AND GENERAL PRACTICE CALCULATORS

Clinical Criteria

• Calculator: ARISCAT (Canet) preoperative pulmonary risk index in adults

• Calculator: Alcohol consumption screening AUDIT questionnaire in adults (Patient education)

• Calculator: American Urological Association (AUA) urinary symptom score

• Calculator: Apgar score in newborns

• Calculator: CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale in adults

• Calculator: Newborn hyperbilirubinemia assessment for infants born at ≥35 weeks gestation

• Calculator: Westley croup severity score (appropriate for use in children ≤6 years of age)

Medical Equations

• Calculator: Absolute eosinophil count

• Calculator: Assessment of malnutrition in females, 0 to 24 months (WHO)

• Calculator: Assessment of malnutrition in females, 2 to 5 years (WHO)

• Calculator: Assessment of malnutrition in males, 0 to 24 months (WHO)

• Calculator: Assessment of malnutrition in males, 2 to 5 years (WHO)

• Calculator: Body mass index (BMI) percentiles and Z-scores, females 2 to 20 years (CDC)

• Calculator: Body mass index (BMI) percentiles and Z-scores, females 2 to 20 years (CDC) (Patient education)

• Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC)

• Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC) (Patient education)

• Calculator: Body surface area (BSA) (Mosteller, square root method) in children and adults

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: Estimated Date of Delivery (EDD)

• Calculator: Estimated date of delivery (EDD) (Patient education)

• Calculator: Gestational age from estimated date of delivery (EDD)

• Calculator: Glomerular filtration rate estimate for children by Schwartz formula

• Calculator: Head circumference-for-age percentiles and Z-scores, 0 to 24 months (WHO)

• Calculator: Head circumference-for-age percentiles and Z-scores, 0 to 36 months (CDC)

• Calculator: Height-for-age percentiles and Z-scores, females 2 to 20 years (CDC)

• Calculator: Height-for-age percentiles and Z-scores, males 2 to 20 years (CDC)

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Length-for-age percentiles and Z-scores, 0 to 24 months (WHO)

• Calculator: Maintenance fluid calculation for children based on daily fluid requirements

• Calculator: PELD-Cr score for end-stage liver disease (patients less than 12 years old)

• Calculator: Post-test probability from likelihood ratios and multiple test results

• Calculator: Post-test probability from pre-test probability, sensitivity, and specificity

• Calculator: Prediction of child's target height (height potential) based on midparental height

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

• Calculator: Spot urine albumin-to-creatinine ratio in adults (conventional and SI units)

• Calculator: Spot urine protein-to-creatinine ratio in adults

• Calculator: Weight-for-age percentiles and Z-scores, 0 to 24 months (WHO)

• Calculator: Weight-for-age percentiles and Z-scores, females 2 to 20 years (CDC)

• Calculator: Weight-for-age percentiles and Z-scores, males 2 to 20 years (CDC)

• Calculator: Weight-for-length percentiles and Z-scores, 0 to 24 months (WHO)

GASTROENTEROLOGY AND HEPATOLOGY CALCULATORS

Clinical Criteria

• Calculator: Blatchford score for gastrointestinal bleeding in adults (conventional and SI units)

• Calculator: CLIF-SOFA score for adults with acute-on-chronic liver disease

• Calculator: Child Pugh score for severity of liver disease in adults (SI units)*

• Calculator: Child Pugh score for severity of liver disease in adults (conventional units)*

• Calculator: Crohn Disease Activity Index (CDAI) in adults

• Calculator: Glasgow alcoholic hepatitis score in adults and adolescents

• Calculator: Harvey-Bradshaw Index of Crohn disease activity in adults

• Calculator: Hepatitis discriminant function for estimating disease severity in adults with alcoholic hepatitis

• Calculator: Mayo score for assessing ulcerative colitis activity in adults

• Calculator: Ranson criteria for pancreatitis prognosis

• Calculator: Rockall score for upper gastrointestinal bleeding in adults

Medical Equations

• Calculator: Aspartate aminotransferase (AST) to platelet ratio index (APRI) in adults (SI units)*

• Calculator: Aspartate aminotransferase (AST) to platelet ratio index (APRI) in adults (conventional units)*

• Calculator: Bedside Index of Severity in Acute Pancreatitis (BISAP) score in adults

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: FIB-4 index, an indirect marker for liver fibrosis in adults (SI units)*

• Calculator: FIB-4 index, an indirect marker for liver fibrosis in adults (conventional units)*

• Calculator: MELD 3.0 score EXCLUDING serum albumin (for patients 12 years and older)

• Calculator: MELD 3.0 score including serum albumin (for patients 12 years and older)

• Calculator: MELD/MELDNa scores (for liver transplantation listing purposes, not appropriate for patient under age 12 years) (SI units)*

• Calculator: MELD/MELDNa scores (for liver transplantation listing purposes, not appropriate for patient under age 12 years) (conventional units)*

• Calculator: Model for Endstage Liver Disease (MELD) score in adults (not for liver transplantation listing purposes) (SI units)*

• Calculator: Model for Endstage Liver Disease (MELD) score in adults (not for liver transplantation listing purposes) (conventional units)*

• Calculator: Mortality risk in postoperative adult patients with cirrhosis (SI units)*

• Calculator: Mortality risk in postoperative adult patients with cirrhosis (conventional units)*

• Calculator: PELD-Cr score for end-stage liver disease (patients less than 12 years old)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Stool osmolal gap

GENERAL SURGERY CALCULATORS

Clinical Criteria

• Calculator: Caprini risk assessment model for venous thromboembolism in adult general surgical patients (Caprini risk score)*

• Calculator: Child Pugh score for severity of liver disease in adults (SI units)*

• Calculator: Child Pugh score for severity of liver disease in adults (conventional units)*

• Calculator: Clinical indicators for malignant hyperthermia in adults (conventional and SI units)

• Calculator: DVT probability in adults: Wells score system

• Calculator: Eckardt symptom score for achalasia in adults and children

• Calculator: Low anterior resection syndrome (LARS) score in adults

• Calculator: Mangled Extremity Severity Score (MESS) in adults

• Calculator: Michigan Risk Score (MRS) for PICC-related thrombosis in hospitalized nonpregnant adults

• Calculator: Modified Wells score for deep vein thrombosis (DVT) in adults

• Calculator: Pressure ulcer risk stratification (Braden score) in adults

• Calculator: Pulmonary embolism Wells score in adults

• Calculator: Ranson criteria for pancreatitis prognosis

• Calculator: Revised venous clinical severity score in adults (2010)

• Calculator: Surgical Apgar score (SAS) in adults undergoing general surgery procedures

• Calculator: Venous segmental disease score for obstruction in adults and adolescents

• Calculator: Venous segmental disease score for reflux in adults and adolescents

• Calculator: Villalta score for severity of post-thrombotic syndrome in adults

Medical Equations

• Calculator: Adult burn injury fluid resuscitation (Parkland crystalloid estimate)

• Calculator: Albumin-bilirubin (ALBI) grade estimate of survival of adults with hepatocellular carcinoma (conventional and SI units)

• Calculator: Basal estimated energy expenditure (Harris-Benedict equation) in adults

• Calculator: Body mass index (BMI) for adults (Metric, Patient education)

• Calculator: Body mass index (BMI) for adults (Patient education)

• Calculator: Body surface area (BSA) in adults (Du Bois method)

• Calculator: Burn injury fluid resuscitation (modified Brooke crystalloid estimate) in adults

• Calculator: Calcium correction in hypoalbuminemia in adults and children ≥1 year (SI units)*

• Calculator: Calcium correction in hypoalbuminemia in adults and children ≥1 year (conventional units)*

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Ideal body weight and adjusted body weight for adults

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Mortality Probability Admission Model (MPM0-III) for critical illness in adults

• Calculator: Mortality risk in postoperative adult patients with cirrhosis (SI units)*

• Calculator: Mortality risk in postoperative adult patients with cirrhosis (conventional units)*

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Serum anion gap (conventional and SI units)

• Calculator: Serum osmolal gap (SI units)*

• Calculator: Serum osmolal gap (conventional units)*

• Calculator: Systemic vascular resistance in adults

• Calculator: Weight loss indices following bariatric surgery in adults

GERIATRICS CALCULATORS

Clinical Criteria

• Calculator: ARISCAT (Canet) preoperative pulmonary risk index in adults

• Calculator: Alcohol consumption screening AUDIT questionnaire in adults (Patient education)

• Calculator: American Urological Association (AUA) urinary symptom score

• Calculator: CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale in adults

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Post-test probability from likelihood ratios and multiple test results

• Calculator: Post-test probability from pre-test probability, sensitivity, and specificity

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

HEMATOLOGY CALCULATORS

Clinical Criteria

• Calculator: 4 Ts score for calculating the pretest probability of heparin-induced thrombocytopenia (HIT)

• Calculator: CNS-IPI (International Prognostic Index for 2-year risk of CNS relapse in DLBCL treated with R-CHOP) in adults

• Calculator: Center for International Blood and Marrow Transplant Research (CIBMTR) chronic graft-versus-host-disease (GVHD) risk score

• Calculator: Clinical characteristics comprising the HAS-BLED bleeding risk score in adults

• Calculator: DVT probability in adults: Wells score system

• Calculator: Genetically inspired international prognostic scoring system (GIPSS) for primary myelofibrosis in adults

• Calculator: International Prognostic Index for non-Hodgkin lymphoma in adults

• Calculator: International Prognostic Score (IPS) in Hodgkin lymphoma (2012 update)

• Calculator: Khorana score for estimating venous thromboembolism risk in adults with cancer

• Calculator: MDACC Myelodysplastic syndrome prognostic model in adults (conventional and SI units)

• Calculator: Mutation and Karyotype-Enhanced International Prognostic Scoring System for Primary Myelofibrosis in adults 70 and younger (MIPSS70+ version 2.0)

• Calculator: Myelodysplastic syndrome international prognostic scoring system (Original IPSS) in adults

• Calculator: PLASMIC score for estimating the likelihood of severe ADAMTS13 deficiency in adults with suspected TTP

• Calculator: Revised International Prognostic Scoring System (IPSS-R) in primary myelodysplastic syndrome in adults

• Calculator: Sokal score for chronic myeloid leukemia in adults

Medical Equations

• Calculator: Absolute eosinophil count

• Calculator: Absolute neutrophil count

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: ELTS (EUTOS long-term survival) score in adults with chronic myeloid leukemia (conventional and SI units)

• Calculator: Mantle cell lymphoma International Prognostic Index (MIPI) in adults

• Calculator: Reticulocyte Production Index (RPI) in adults

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Splenic Marginal Zone Lymphoma Study Group (SMZLSG) prognostic index in adults

• Calculator: Transferrin saturation (TSAT) in adults (conventional units)*

HOSPITAL MEDICINE CALCULATORS

Clinical Criteria

• Calculator: APACHE II scoring system by admission diagnosis in adults

• Calculator: CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale in adults

• Calculator: Clinical diagnosis of endocarditis* (not appropriate for neonates [age ≤28 days])

• Calculator: Clinical indicators for malignant hyperthermia in adults (conventional and SI units)

• Calculator: Community-acquired pneumonia severity index (PSI) for adults

• Calculator: DVT probability in adults: Wells score system

• Calculator: Pressure ulcer risk stratification (Braden score) in adults

• Calculator: Pulmonary embolism Wells score in adults

• Calculator: Revised venous clinical severity score in adults (2010)

• Calculator: Thrombolysis in Myocardial Infarction (TIMI) score for ST elevation MI in adults

• Calculator: Thrombolysis in Myocardial Infarction (TIMI) score for unstable angina or non-ST elevation MI in adults

Medical Equations

• Calculator: A-a gradient (alveolar-arterial gradient; AaG)

• Calculator: Absolute neutrophil count

• Calculator: Adult burn injury fluid resuscitation (Parkland crystalloid estimate)

• Calculator: Body mass index (BMI; Quetelet's index) in adults

• Calculator: Body surface area (BSA) (Mosteller, square root method) in children and adults

• Calculator: Burn injury fluid resuscitation (modified Brooke crystalloid estimate) in adults

• Calculator: Calcium correction in hypoalbuminemia in adults and children ≥1 year (SI units)*

• Calculator: Calcium correction in hypoalbuminemia in adults and children ≥1 year (conventional units)*

• Calculator: Cardiac output in adults (conventional and SI units)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Creatinine clearance (measured) in adults and children age 1 month and older

• Calculator: Creatinine clearance estimate by Cockcroft-Gault equation in adults and older adolescents (age ≥16 years) (SI units)*

• Calculator: Creatinine clearance estimate by Cockcroft-Gault equation in adults and older adolescents (age ≥16 years) (conventional units)*

• Calculator: Estimated albumin excretion rate from spot urine albumin and creatinine for adults (conventional and SI units)

• Calculator: Estimated protein excretion rate from spot urine protein and creatinine in adults (conventional and SI units)

• Calculator: Fractional excretion of sodium (SI units)*

• Calculator: Fractional excretion of sodium (conventional units)*

• Calculator: Glomerular filtration rate estimate for children by Schwartz formula

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Oxygenation index in neonates, children, and adults

• Calculator: Pulmonary vascular resistance (PVR) and pulmonary vascular resistance index (PVRI) in adults and children

• Calculator: QT interval correction (ECG) in adults and children

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Serum osmolal gap (SI units)*

• Calculator: Serum osmolal gap (conventional units)*

• Calculator: Spot urine albumin-to-creatinine ratio in adults (conventional and SI units)

• Calculator: Spot urine protein-to-creatinine ratio in adults

• Calculator: Systemic vascular resistance in adults

• Calculator: Transferrin saturation (TSAT) in adults (SI units)*

INFECTIOUS DISEASES CALCULATORS

Clinical Criteria

• Calculator: CURB-65 pneumonia severity score

• Calculator: Clinical diagnosis of endocarditis* (not appropriate for neonates [age ≤28 days])

• Calculator: Community-acquired pneumonia severity index (PSI) for adults

• Calculator: Multinational Association for Supportive Care in Cancer (MASCC) risk index for patients with neutropenic fever (not appropriate for children <16 years of age)

Medical Equations

• Calculator: Adjusted cerebrospinal fluid white blood cell count in the presence of red blood cells

• Calculator: Aspartate aminotransferase (AST) to platelet ratio index (APRI) in adults (SI units)*

• Calculator: Aspartate aminotransferase (AST) to platelet ratio index (APRI) in adults (conventional units)*

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: FIB-4 index, an indirect marker for liver fibrosis in adults (SI units)*

• Calculator: FIB-4 index, an indirect marker for liver fibrosis in adults (conventional units)*

• Calculator: Ideal body weight and adjusted body weight for adults

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

NEPHROLOGY AND HYPERTENSION CALCULATORS

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Creatinine clearance (measured) in adults and children age 1 month and older

• Calculator: Creatinine clearance estimate by Cockcroft-Gault equation in adults and older adolescents (age ≥16 years) (SI units)*

• Calculator: Creatinine clearance estimate by Cockcroft-Gault equation in adults and older adolescents (age ≥16 years) (conventional units)*

• Calculator: Estimated albumin excretion rate from spot urine albumin and creatinine for adults (conventional and SI units)

• Calculator: Estimated protein excretion rate from spot urine protein and creatinine in adults (conventional and SI units)

• Calculator: Fractional excretion of magnesium (SI units)*

• Calculator: Fractional excretion of magnesium (conventional units)*

• Calculator: Fractional excretion of sodium (SI units)*

• Calculator: Fractional excretion of sodium (conventional units)*

• Calculator: Glomerular filtration rate (GFR) by CKD-EPI equation in adults (conventional and SI units)

• Calculator: Glomerular filtration rate estimation (eGFR) by CKD-EPI equation with creatinine and cystatin C, in adults, without race (2021)

• Calculator: Glomerular filtration rate estimation (eGFR) by CKD-EPI equation with cystatin C, in adults, without race (2012)

• Calculator: Kt/V dialysis dose Daugirdas formula (SI units)*

• Calculator: Kt/V dialysis dose Daugirdas formula (conventional units)*

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Residual kidney urea clearance (KrU) in hemodialysis patients

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Serum anion gap (conventional and SI units)

• Calculator: Serum osmolal gap (SI units)*

• Calculator: Serum osmolal gap (conventional units)*

• Calculator: Spot urine albumin-to-creatinine ratio in adults (conventional and SI units)

• Calculator: Spot urine protein-to-creatinine ratio in adults

• Calculator: Spot urine protein-to-creatinine ratio in children (6 months to 18 years of age)

• Calculator: Urine anion gap (conventional and SI units)

• Calculator: Urine osmolal gap (SI units)*

• Calculator: Urine osmolal gap (conventional units)*

• Calculator: Urine potassium-to-creatinine ratio in adults and children ≥1 year of age

NEUROLOGY CALCULATORS

Clinical Criteria

• Calculator: ABCD2 score to predict stroke risk after TIA in adults

• Calculator: Apgar score in newborns

• Calculator: Epworth Sleepiness Scale (ESS) in adults

• Calculator: National Institutes of Health Stroke Scale (NIHSS) score in adults

• Calculator: Risk of paradoxical embolism (RoPE) score in adults

• Calculator: Stroke risk in female patients (55 to 84 years) (Framingham data)

• Calculator: Stroke risk in male patients (55 to 84 years) (Framingham data)

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

OBSTETRICS, GYNECOLOGY AND WOMEN'S HEALTH CALCULATORS

Clinical Criteria

• Calculator: Trial of labor after cesarean (TOLAC) for use at entry to prenatal care

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Estimated 24-hour urine protein excretion in pregnancy (from spot urine protein to creatinine ratio) (conventional and SI units)

• Calculator: Estimated Date of Delivery (EDD)

• Calculator: Estimated date of delivery (EDD) (Patient education)

• Calculator: Gestational age from estimated date of delivery (EDD)

• Calculator: Nuchal translucency (NT) percentile for measured crown-rump length (CRL)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

ONCOLOGY CALCULATORS

Clinical Criteria

• Calculator: Breast cancer risk assessment by Gail Model (2018)

• Calculator: Breast cancer risk assessment incorporating breast density (BCSC 2015)

• Calculator: Cancer and Aging Research Group-Breast Cancer (CARG-BC) score for older adults

• Calculator: UCLA Integrated Staging System (UISS) prognostic model for adults with renal cell carcinoma treated with nephrectomy

Medical Equations

• Calculator: Albumin-bilirubin (ALBI) grade estimate of survival of adults with hepatocellular carcinoma (conventional and SI units)

• Calculator: Body surface area (BSA) (Mosteller, square root method) in children and adults

• Calculator: Body surface area (BSA) in adults (Du Bois method)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: MELD 3.0 score EXCLUDING serum albumin (for patients 12 years and older)

• Calculator: MELD 3.0 score including serum albumin (for patients 12 years and older)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

PALLIATIVE CARE CALCULATORS

Clinical Criteria

• Calculator: BODE Index for COPD survival prediction in adults

• Calculator: CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale in adults

• Calculator: Child Pugh score for severity of liver disease in adults (SI units)*

• Calculator: Child Pugh score for severity of liver disease in adults (conventional units)*

• Calculator: Depression screening by a nine-item Patient Health Questionnaire (PHQ-9) in adults

• Calculator: Pressure ulcer risk stratification (Braden score) in adults

• Calculator: Sleep problems questionnaire in adults

Medical Equations

• Calculator: Albumin-bilirubin (ALBI) grade estimate of survival of adults with hepatocellular carcinoma (conventional and SI units)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

PEDIATRICS CALCULATORS

Clinical Criteria

• Calculator: Apgar score in newborns

• Calculator: Corrected/adjusted age of preterm infants

• Calculator: Newborn hyperbilirubinemia assessment for infants born at ≥35 weeks gestation

• Calculator: Pediatric ulcerative colitis activity index (PUCAI)

• Calculator: Westley croup severity score (appropriate for use in children ≤6 years of age)

Medical Equations

• Calculator: Absolute eosinophil count

• Calculator: Assessment of malnutrition in females, 0 to 24 months (WHO)

• Calculator: Assessment of malnutrition in females, 2 to 5 years (WHO)

• Calculator: Assessment of malnutrition in males, 0 to 24 months (WHO)

• Calculator: Assessment of malnutrition in males, 2 to 5 years (WHO)

• Calculator: Basal metabolic rate (BMR) using Schofield equations in children and adolescents

• Calculator: Blood pressure percentiles, 0 to 17 years (2017 standard)

• Calculator: Body mass index (BMI) percentiles and Z-scores, females 2 to 20 years (CDC)

• Calculator: Body mass index (BMI) percentiles and Z-scores, females 2 to 20 years (CDC) (Patient education)

• Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC)

• Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC) (Patient education)

• Calculator: Body surface area (BSA) (Mosteller, square root method) in children and adults

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Estimated energy requirement (EER) for females, birth to 18 years (revised 2023)

• Calculator: Estimated energy requirement (EER) for males, birth to 18 years (revised 2023)

• Calculator: Glomerular filtration rate estimate for children by Schwartz formula

• Calculator: Glomerular filtration rate estimation (eGFR) by CKiD U25 equations with creatinine and/or cystatin C in children and adults ≤25 years old (2021)

• Calculator: Head circumference-for-age percentiles and Z-scores, 0 to 24 months (WHO)

• Calculator: Head circumference-for-age percentiles and Z-scores, 0 to 36 months (CDC)

• Calculator: Height-for-age percentiles and Z-scores, females 2 to 20 years (CDC)

• Calculator: Height-for-age percentiles and Z-scores, males 2 to 20 years (CDC)

• Calculator: Length-for-age percentiles and Z-scores, 0 to 24 months (WHO)

• Calculator: MELD 3.0 score EXCLUDING serum albumin (for patients 12 years and older)

• Calculator: MELD 3.0 score including serum albumin (for patients 12 years and older)

• Calculator: Maintenance fluid calculation for children based on daily fluid requirements

• Calculator: Maintenance fluid calculation for children based on hourly fluid requirements

• Calculator: PELD-Cr score for end-stage liver disease (patients less than 12 years old)

• Calculator: PFT predicted values in children and adults (2022, race-neutral GLI equations)

• Calculator: Peak expiratory flow prediction in females (5 to <18 years)

• Calculator: Peak expiratory flow prediction in males (5 to <18 years)

• Calculator: Prediction of child's target height (height potential) based on midparental height

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Spot urine albumin-to-creatinine ratio in adults (conventional and SI units)

• Calculator: Spot urine protein-to-creatinine ratio in adults

• Calculator: Spot urine protein-to-creatinine ratio in children (6 months to 18 years of age)

• Calculator: Urine potassium-to-creatinine ratio in adults and children ≥1 year of age

• Calculator: Weight-for-age percentiles and Z-scores, 0 to 24 months (WHO)

• Calculator: Weight-for-age percentiles and Z-scores, females 2 to 20 years (CDC)

• Calculator: Weight-for-age percentiles and Z-scores, males 2 to 20 years (CDC)

• Calculator: Weight-for-length percentiles and Z-scores, 0 to 24 months (WHO)

PRIMARY CARE (ADULT) CALCULATORS

Clinical Criteria

• Calculator: ARISCAT (Canet) preoperative pulmonary risk index in adults

• Calculator: Alcohol consumption screening AUDIT questionnaire in adults (Patient education)

• Calculator: American Urological Association (AUA) urinary symptom score

• Calculator: Breast cancer risk assessment by Gail Model (2018)

• Calculator: Breast cancer risk assessment incorporating breast density (BCSC 2015)

• Calculator: CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale in adults

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: Lean body weight (LBW, adult female)

• Calculator: Lean body weight (LBW, adult male)

• Calculator: Post-test probability from likelihood ratios and multiple test results

• Calculator: Post-test probability from pre-test probability, sensitivity, and specificity

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

PRIMARY CARE SPORTS MEDICINE (ADOLESCENTS AND ADULTS) CALCULATORS

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Immunology lab values

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Immunology lab values

PSYCHIATRY CALCULATORS

Clinical Criteria

• Calculator: Alcohol consumption screening AUDIT questionnaire in adults (Patient education)

• Calculator: Depression screening by a nine-item Patient Health Questionnaire (PHQ-9) in adults

• Calculator: GAD-7 anxiety scale in adults

Medical Equations

• Calculator: Body mass index (BMI) for adults (Metric, Patient education)

• Calculator: Body mass index (BMI) for adults (Patient education)

• Calculator: Body mass index (BMI) percentiles and Z-scores, females 2 to 20 years (CDC) (Patient education)

• Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC) (Patient education)

• Calculator: Body mass index (BMI; Quetelet's index) in adults

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

PULMONARY AND CRITICAL CARE CALCULATORS

Clinical Criteria

• Calculator: APACHE II scoring system by admission diagnosis in adults

• Calculator: BODE Index for COPD survival prediction in adults

• Calculator: COPD Assessment Test (CAT)

• Calculator: Clinical characteristics comprising the HAS-BLED bleeding risk score in adults

• Calculator: Clinical criteria for exudative pleural effusion in adults (Light's criteria with continuous likelihood ratios)

• Calculator: Clinical criteria for exudative pleural effusion in adults (pleural fluid only-3 criteria with continuous likelihood ratios)

• Calculator: Clinical criteria for exudative pleural effusion in adults (pleural fluid only-3 criteria)

• Calculator: Enhanced STOP-Bang screening questionnaire for obstructive sleep apnea (OSA) in adults

• Calculator: Geneva risk score for venous thromboembolism in hospitalized adult medical patients

• Calculator: Gupta postoperative pneumonia risk in adults

• Calculator: Gupta postoperative respiratory failure risk in adults

• Calculator: Khorana score for estimating venous thromboembolism risk in adults with cancer

• Calculator: Modified Geneva score for estimation of the clinical probability of pulmonary embolism in adults

• Calculator: Modified Medical Research Council (mMRC) scale for dyspnea

• Calculator: Modified Wells score for deep vein thrombosis (DVT) in adults

• Calculator: National Early Warning Score (NEWS2) for acute illness in adults

• Calculator: Padua score for assessing venous thromboembolism risk in hospitalized adult patients

• Calculator: Predicted body weight and tidal volume in adults

• Calculator: Predicted body weight for mechanical ventilation in adults

• Calculator: Predicted total lung capacity (pTLC) in adults

• Calculator: Pulmonary Embolism Rule-Out Criteria (PERC) rule

• Calculator: Pulmonary embolism Wells score in adults

• Calculator: RAPID score for risk stratification in adults with pleural infection

• Calculator: REVEAL pulmonary arterial hypertension (PAH) score and estimated 1 year survival for adult patients with PAH (group 1)

• Calculator: Respiratory failure risk in adult males during postoperative period of noncardiac surgery

• Calculator: Sequential Organ Failure Assessment (Quick) qSOFA score in adults

• Calculator: Sequential Organ Failure Assessment (SOFA) score in adults

• Calculator: VTE-BLEED score for risk of bleeding among adults receiving long-term anticoagulation

Medical Equations

• Calculator: A-a gradient (alveolar-arterial gradient; AaG)

• Calculator: Clinical criteria for exudative pleural effusion in adults (Light's criteria)

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: Diffusing capacity for carbon monoxide (DLCO) correction of predicted value for anemia (SI units)*

• Calculator: Diffusing capacity for carbon monoxide (DLCO) correction of predicted value for anemia (conventional units)*

• Calculator: Mean arterial pressure (MAP) in adults and children (conventional and SI units)

• Calculator: Mortality Probability Admission Model (MPM0-III) for critical illness in adults

• Calculator: Oxygenation index in neonates, children, and adults

• Calculator: PFT predicted values in children and adults (2022, race-neutral GLI equations)

• Calculator: Peak expiratory flow prediction in females (18 to 85 years)

• Calculator: Peak expiratory flow prediction in males (18 to 85 years)

• Calculator: Predicted postoperative FEV1 following lung resection surgery (anatomic method) in adults

• Calculator: Predicted postoperative FEV1 following lung resection surgery (perfusion method) in adults

• Calculator: Ratio of arterial oxygen tension to fraction of inspired oxygen (PaO2/FiO2 ratio)

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

• Calculator: Solitary pulmonary nodule malignancy risk in adults (Brock University cancer prediction equation)

RHEUMATOLOGY CALCULATORS

Clinical Criteria

• Calculator: Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) in adults

• Calculator: Rheumatoid arthritis Clinical Disease Activity Index (CDAI) in adults

• Calculator: Rheumatoid arthritis Disease Activity Score with C-reactive protein (DAS28-CRP) in adults

• Calculator: Rheumatoid arthritis Disease Activity Score with Erythrocyte Sedimentation Rate (DAS28-ESR) in adults

• Calculator: Rheumatoid arthritis Simplified Disease Activity Index (SDAI) in adults

Medical Equations

• Calculator: Conventional (gravimetric, imperial, US) unit to SI unit conversions: Chemistry and endocrine tests

• Calculator: SI unit to conventional (gravimetric, imperial, US) unit conversions: Chemistry and endocrine tests

SLEEP MEDICINE CALCULATORS

Clinical Criteria

• Calculator: Enhanced STOP-Bang screening questionnaire for obstructive sleep apnea (OSA) in adults

• Calculator: Epworth Sleepiness Scale (ESS) in adults

• Calculator: Sleep problems questionnaire in adults

UNIT CONVERSIONS CALCULATORS