Clinical Calculators
9 free clinical calculators. Every tool is free, private and works on any device.
eGFR Calculator
Estimate glomerular filtration rate (eGFR) with the CKD-EPI 2021 equation, with the CKD stage for the result. Educational tool only.
Creatinine Clearance Calculator
Calculate creatinine clearance (CrCl) with the Cockcroft-Gault equation — widely used for renal drug dosing. Educational tool only.
Anion Gap Calculator
Calculate the anion gap and the albumin-corrected anion gap from sodium, chloride, bicarbonate and albumin. Educational tool only.
Infusion Rate Calculator
Work out infusion rate in mL/hour and drops per minute from volume and time — the standard IV drip rate calculation. Educational tool only.
Maintenance Fluids Calculator
Calculate maintenance IV fluid requirements using the Holliday-Segar 4-2-1 rule, for adults and children by weight. Educational tool only.
Anticholinergic Burden Calculator
Score anticholinergic burden with the ACB (Anticholinergic Cognitive Burden) scale — look up each medication and total the published scores. Educational tool only.
PERC Rule Calculator
Apply the PERC rule (Pulmonary Embolism Rule-out Criteria) — eight criteria that, when all absent, rule out PE in a low pre-test probability patient. Educational tool only.
Wells Score for Pulmonary Embolism
Calculate the Wells score for pulmonary embolism and see whether PE is likely or unlikely, with the matching diagnostic pathway. Educational tool only.
Wells Score for DVT
Calculate the Wells score for deep vein thrombosis and see whether DVT is likely or unlikely, with the two-tier and three-tier interpretations. Educational tool only.