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40 clinical calculators for medication maths and beyond. They run in your browser: nothing to install, nothing sent anywhere.

mg to mL CalculatorHow many mL to draw up for a dose in mg, from the concentration on the label.mg/kg Dose to mLTurns a weight-based mg/kg order into a dose in mg and a volume in mL, with an optional maximum.Units to mL CalculatorVolume for a dose prescribed in units (heparin, insulin and similar) from a units/mL product.Tablet Dose CalculatorHow many tablets make up a fixed or weight-based dose, given the strength of one tablet.IV Rate in mL/hPump rate in mL/h from the volume to infuse and the time it should run over.Drip Rate (gtt/min)Drops per minute for a gravity infusion, from mL/h or from volume and time.gtt/min to mL/hWorks out the real mL/h from drops you counted and the drop factor of the set.mcg/kg/min InfusionConverts a weight-based dose rate in mcg/kg/min into mL/h, and back.Infusion Time & Finish TimeHow long a volume takes at a given mL/h, and the clock time it will finish.Dilution Calculator (C1V1 = C2V2)Solves C1·V1 = C2·V2 for the missing value and tells you how much diluent to add.Final IV Bag ConcentrationConcentration in a bag or syringe once the drug has been added, in mg/mL and mcg/mL.Body Surface Area (BSA)BSA in m² with Mosteller, Du Bois, Haycock or Gehan & George, side by side.Ideal Body Weight (Devine)Adult ideal body weight from height and sex with the Devine formula.Adjusted Body WeightAdjusted body weight with the 0.4 factor, for protocols that dose on it.eGFR (CKD-EPI 2021)Estimated GFR with the race-free CKD-EPI 2021 creatinine equation and its G stage.Creatinine Clearance (Cockcroft-Gault)CrCl in mL/min with Cockcroft-Gault, for drug labels that dose on it.Corrected CalciumTotal calcium adjusted for a low or high albumin, in mmol/L or mg/dL.Anion GapAnion gap from sodium, chloride and bicarbonate, with an optional albumin adjustment.Serum Osmolality & Osmolal GapCalculated serum osmolality and, with a measured value, the osmolal gap.Corrected Sodium in HyperglycaemiaSodium adjusted for high glucose with the Katz (1.6) or Hillier (2.4) factor.Fluid Balance (Intake & Output)Adds up recorded intake and output and shows the positive or negative balance.Paediatric Maintenance FluidsHourly (4-2-1) and daily (100-50-20) maintenance fluids from a child’s weight.Glasgow Coma Scale (GCS)Eye, verbal and motor responses added up to a 3–15 score, with the E-V-M breakdown.APGAR ScoreThe newborn check at 1 and 5 minutes: five signs scored 0–2 for a total out of 10.qSOFA ScoreThree bedside signs that flag adults with suspected infection at higher risk of a poor outcome.CURB-65 Pneumonia SeverityFive criteria that estimate the severity of community-acquired pneumonia in adults.CHA₂DS₂-VASc Score (and CHA₂DS₂-VA)Stroke risk in atrial fibrillation, shown both with and without the sex category.HAS-BLED Bleeding RiskMajor bleeding risk in patients with atrial fibrillation on anticoagulation.Wells Score for PEPre-test probability of pulmonary embolism, in the two-tier and three-tier versions.Mean Arterial Pressure (MAP)MAP from systolic and diastolic pressure, with pulse pressure.Blood Pressure Category CheckerWhat a blood pressure reading means, by the AHA/ACC 2017 or ESH 2023 categories, with MAP and pulse pressure.Corrected QT (QTc)QT corrected for heart rate with Bazett, Fridericia, Framingham and Hodges side by side.Shock IndexHeart rate divided by systolic pressure: a quick flag for hidden haemodynamic instability.P/F Ratio (PaO₂/FiO₂)PaO₂ divided by FiO₂, in mmHg or kPa, with the Berlin ARDS oxygenation bands.Pack-Years CalculatorLifetime smoking exposure from cigarettes per day and years smoked.BMI CalculatorBody mass index for adults, the WHO category and the healthy weight range for your height.Body Fat Calculator (US Navy)Body fat percentage from a tape measure (neck, waist and hips), with fat and lean mass.Calorie Needs (BMR & TDEE)Resting energy with Mifflin-St Jeor, daily needs for your activity level and an optional calorie-deficit target.Pregnancy Due DateEstimated due date and how many weeks pregnant you are, from the last menstrual period.Parkland Formula (Burns)First 24 h fluid estimate for adult burns: total volume and the rates for the first 8 and next 16 hours.