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.
Lab & formulation
6 toolsC₁V₁=C₂V₂ for bench dilutions
Stepwise dilution for microbiology and HPLC
Solution concentration in mol/L
Henderson-Hasselbalch pH from acid/base ratio
mg ↔ mcg ↔ g, mL ↔ L, kg ↔ lbs
Estimated fill weight by capsule size
Clinical & nursing
9 toolsWeight-based mg/kg prescribing
Drops per minute from volume and drop factor
mL/hour infusion rate
Bazett, Fridericia, Framingham, Hodges
CKD-EPI 2021, MDRD, BSA-adjusted eGFR
Cockcroft-Gault renal function estimate
Body surface area for oncology dosing
mOsm/L for IV solution assessment
Total tablets for a treatment course
Critical care & respiratory
8 toolsEffluent-based clearance for renal replacement therapy
Fractional excretion of sodium for AKI context
Alveolar-arterial oxygen gradient
Estimated alveolar oxygen tension
MAP from SBP/DBP with ICU perfusion reference
FiO₂, MAP, and PaO₂ severity metric
Non-invasive S/F surrogate for P/F and ARDS
Ventilation pressure and PaCO₂ endpoint
Pharmacokinetics
7 toolsConcentration remaining after elapsed time
Trapezoidal exposure from concentration-time data
Apparent Vd, L/kg, and loading dose helper
CL from dose/AUC, ke×Vd, or half-life
Target concentration × Vd / F
Dose rate from Css, clearance, interval, and F
Absolute and relative F from AUC and dose
Manufacturing & QA
2 toolsAbout 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.