General Medicine medical calculators
Everyday internal medicine calculators.
General medicine calculators cover BMI, BSA, ideal body weight, anion gap, corrected calcium and sodium, PHQ-9, GAD-7, and other everyday ward and clinic tools. They are intended for adult medicine workflows unless a pediatric-specific page is linked.
22 calculators
Absolute Neutrophil Count (ANC)
ANCCompute absolute neutrophil count from WBC and neutrophil/band percentages or fractions.
Anion Gap Calculator
Anion GapCalculate serum anion gap with optional albumin correction for acid-base workups.
BMI Calculator
BMICalculate body mass index from metric or imperial measurements with WHO category labels.
Body Surface Area (BSA)
BSACalculate body surface area with Mosteller, DuBois & DuBois, Haycock, or Gehan & George formulas. Compare all methods side by side.
Centor / McIsaac Strep Score
CentorEstimate group A strep pharyngitis probability with the modified Centor (McIsaac) score.
CHA₂DS₂-VASc Score
CHA₂DS₂-VAScEstimate stroke risk in nonvalvular atrial fibrillation to guide anticoagulation decisions.
Cockcroft–Gault CrCl
CrClEstimate creatinine clearance with the Cockcroft–Gault equation for drug-dosing contexts.
Corrected Calcium
Corrected CaEstimate albumin-corrected serum calcium for hypoalbuminemic patients.
Corrected Phenytoin
PhenytoinAdjust total phenytoin concentration for hypoalbuminemia using the Sheiner–Tozer equation.
Corrected Reticulocyte Count
Corrected ReticCorrect the reticulocyte percentage for anemia severity using hematocrit.
Corrected Sodium (Hyperglycemia)
Corrected NaCorrect measured sodium for hyperglycemia using Katz (1.6) or Hillier (2.4) factors.
CURB-65 Pneumonia Severity
CURB-65Stratify community-acquired pneumonia severity and site-of-care decisions using CURB-65.
eGFR Calculator (CKD-EPI 2021)
eGFREstimate glomerular filtration rate with the race-free CKD-EPI 2021 creatinine equation and view CKD stage banding.
GAD-7 Anxiety Score
GAD-7Screen and monitor generalized anxiety symptom severity with GAD-7.
HAS-BLED Bleeding Risk Score
HAS-BLEDEstimate major bleeding risk in patients on anticoagulation for atrial fibrillation.
HOMA-IR
HOMA-IREstimate insulin resistance from fasting glucose and insulin (HOMA-IR).
Ideal Body Weight (Devine)
IBWCalculate Devine ideal body weight, adjusted body weight, and estimated lean body weight.
LDL Cholesterol (Friedewald)
LDLEstimate LDL-C from total cholesterol, HDL, and triglycerides using Friedewald.
Maintenance Fluids (4-2-1)
Maintenance FluidsEstimate hourly and daily maintenance IV fluid rates with the Holiday–Segar / 4-2-1 rule.
mg/kg Dose Calculator
mg/kgConvert a mg/kg dose and patient weight into a total milligram dose and optional volume.
PHQ-9 Depression Score
PHQ-9Screen and monitor depression symptom severity with the Patient Health Questionnaire-9.
Wells Score for DVT
Wells DVTEstimate pretest probability of lower-extremity deep vein thrombosis with the Wells DVT criteria.