Sunday, July 5, 2026

Free pharmaceutical calculators

Pharma Calculators

Dosage, dilution, IV rates, GFR/eGFR, QTc, renal dosing, AUC, clearance, loading dose, maintenance dose, half-life, and batch yield — built for pharmacists, nurses, formulation scientists, and clinical researchers. No login required.

32 Calculators
Free Always
0 Login required

Lab & formulation

6 tools

Clinical & nursing

9 tools

Critical care & respiratory

8 tools

Pharmacokinetics

7 tools

Manufacturing & QA

2 tools

About these calculators

These calculators are built for pharmacists, nurses, clinical researchers, formulation scientists, and pharmacy students who need fast, reliable results without downloading software or logging into a platform. Each calculator matches formulas used in standard pharmaceutical references and clinical practice guidelines.

Dosage & clinical

The Dosage Calculator handles weight-based (mg/kg) prescribing. The GFR Calculator calculates CKD-EPI 2021 eGFR, MDRD reference eGFR, and BSA-adjusted renal function for medication-related decisions. The QTc Calculator compares Bazett, Fridericia, Framingham, Hodges, and Rautaharju corrections for cardiac safety review. The Creatinine Clearance Calculator uses Cockcroft-Gault for renal dose adjustments. The IV Drip Rate Calculator converts volume, drop factor, and infusion time into drops per minute.

Lab & formulation

The Dilution Calculator applies C1V1=C2V2 for bench dilutions. The Molarity Calculator determines solution concentration in mol/L.

Pharmacokinetics

Use the Half-Life Calculator to find drug remaining after any number of half-lives, or time to reach a target concentration. The AUC Calculator estimates observed exposure from concentration-time data, the Clearance Calculator converts dose, AUC, ke, Vd, and half-life into CL, and the Loading Dose and Maintenance Dose calculators support practical PK regimen planning. Use the Bioavailability Calculator when comparing dose-normalized exposure between routes or formulations.