Calculators
Evigrade clinical calculators. Every formula is covered by unit tests with reference cases from published sources.
CHA₂DS₂-VASc (Stroke Risk in Atrial Fibrillation)
Thromboembolic risk score in atrial fibrillation for anticoagulation decisions.
CardiologyNeurologyGeneral practiceCURB-65 (Pneumonia Severity)
Community-acquired pneumonia severity score for site-of-care decision.
PulmonologyGeneral practiceFINDRISC (Type 2 Diabetes Risk)
Finnish score for 10-year type 2 diabetes risk assessment.
EndocrinologyGeneral practiceFamily medicineHAS-BLED (Bleeding Risk on Anticoagulation)
Bleeding risk in patients on anticoagulation. Used alongside CHA₂DS₂-VASc.
CardiologyGeneral practiceHOMA-IR (Insulin Resistance Index)
Insulin resistance index from fasting insulin and glucose. Metabolic syndrome marker.
EndocrinologyGeneral practiceGynecologyPHQ-9 (Depression Questionnaire)
Depression screening and severity assessment using Patient Health Questionnaire.
PsychiatryGeneral practiceFamily medicineAbsolute Neutrophil Count (ANC)
Absolute neutrophil count for neutropenia grading.
OncologyGeneral practiceAnion Gap (Albumin-Corrected)
Anion gap calculation for differential diagnosis of metabolic acidosis.
NephrologyGeneral practiceIdeal Body Weight (Devine Formula)
Ideal and adjusted body weight for drug dosing.
General practiceOncologyNephrologyChild-Pugh Score (Liver Cirrhosis)
Liver cirrhosis severity and survival prognosis assessment.
GastroenterologyBody Mass Index (BMI)
Body mass index from height and weight with WHO classification.
General practiceFamily medicineEndocrinologyCreatinine Clearance (Cockcroft-Gault)
Creatinine clearance for drug dose adjustment. Not equivalent to eGFR.
NephrologyGeneral practiceOncologyCorrected QT Interval (Bazett)
Heart rate-corrected QT interval for assessing QT prolongation risk.
CardiologyGeneral practiceAlbumin-Corrected Calcium
Serum calcium corrected for albumin concentration.
NephrologyEndocrinologyGeneral practiceWells Score for DVT
Pre-test probability of deep vein thrombosis using Wells criteria.
CardiologyGeneral practicePulmonologyWells Score for Pulmonary Embolism
Pre-test probability of pulmonary embolism using Wells criteria.
PulmonologyCardiologyGeneral practiceLDL Cholesterol (Friedewald)
LDL cholesterol by Friedewald equation. Not valid when triglycerides exceed 4.5 mmol/L.
CardiologyGeneral practiceEndocrinologyResting Metabolic Rate (Mifflin-St Jeor) + TDEE
Resting metabolic rate and total daily energy expenditure by activity level. Most accurate formula for adults per ADA Evidence Analysis.
EndocrinologyGeneral practiceFamily medicineBody Surface Area (BSA) — Du Bois & Mosteller
Body surface area for chemotherapy dosing, GFR normalization, and cardiac index calculation.
OncologyNephrologyCardiologyTotal Iron Deficit (Ganzoni Formula)
Total parenteral iron dose for iron deficiency anemia correction.
General practiceGynecologyGastroenterologyCalculated Serum Osmolality
Calculated serum osmolality for fluid-electrolyte disorders and osmolal gap assessment.
NephrologyGeneral practiceeGFR — CKD-EPI 2021 (race-free)
Estimates glomerular filtration rate using the CKD-EPI 2021 creatinine equation. This is the race-free version recommended in the United States and compatible with KDIGO 2024.
NephrologyGeneral practiceCardiologyMean Arterial Pressure (MAP)
Mean arterial pressure from systolic and diastolic blood pressure.
CardiologyGeneral practiceMELD Score (Liver Disease)
Chronic liver disease severity and 90-day mortality prognosis.
GastroenterologyNephrology