Medication maths for nurses
Medication maths, one clear step at a time.
Free clinical calculators for doses, infusions, dilutions and lab values. Every result shows the working, so you can check it and learn the method.
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- mg to mL CalculatorMedication doses
- mg/kg Dose to mLMedication doses
- Units to mL CalculatorMedication doses
- Tablet Dose CalculatorMedication doses
- IV Rate in mL/hIV & infusions
- Drip Rate (gtt/min)IV & infusions
- gtt/min to mL/hIV & infusions
- mcg/kg/min InfusionIV & infusions
- Infusion Time & Finish TimeIV & infusions
- Dilution Calculator (C1V1 = C2V2)Dilutions & concentration
- Final IV Bag ConcentrationDilutions & concentration
- Body Surface Area (BSA)Body measures
- Ideal Body Weight (Devine)Body measures
- Adjusted Body WeightBody measures
- eGFR (CKD-EPI 2021)Kidney function
- Creatinine Clearance (Cockcroft-Gault)Kidney function
- Corrected CalciumLab values
- Anion GapLab values
- Serum Osmolality & Osmolal GapLab values
- Corrected Sodium in HyperglycaemiaLab values
- Fluid Balance (Intake & Output)Fluids & burns
- Paediatric Maintenance FluidsFluids & burns
- Glasgow Coma Scale (GCS)Clinical scores
- APGAR ScoreClinical scores
- qSOFA ScoreClinical scores
- CURB-65 Pneumonia SeverityClinical scores
- CHA₂DS₂-VASc Score (and CHA₂DS₂-VA)Clinical scores
- HAS-BLED Bleeding RiskClinical scores
- Wells Score for PEClinical scores
- Mean Arterial Pressure (MAP)Heart & lungs
- Blood Pressure Category CheckerHeart & lungs
- Corrected QT (QTc)Heart & lungs
- Shock IndexHeart & lungs
- P/F Ratio (PaO₂/FiO₂)Heart & lungs
- Pack-Years CalculatorHeart & lungs
- BMI CalculatorEveryday health
- Body Fat Calculator (US Navy)Everyday health
- Calorie Needs (BMR & TDEE)Everyday health
- Pregnancy Due DateEveryday health
- Parkland Formula (Burns)Fluids & burns
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What you will find
Built for the ward, not for guesswork.
6 calculators
Heart & lungs
Blood pressure categories, MAP, QTc, shock index, P/F ratio and pack-years.
Most used calculators
mg to mL CalculatorMedication dosesBlood Pressure Category CheckerHeart & lungsBMI CalculatorEveryday healthDrip Rate (gtt/min)IV & infusionsGlasgow Coma Scale (GCS)Clinical scoresmcg/kg/min InfusionIV & infusionseGFR (CKD-EPI 2021)Kidney functionBody Surface Area (BSA)Body measuresWhy the working mattersHow we calculate →
Every step, in order
The formula and your numbers, one line at a time. No black boxes.
A 10× error stands out
Volumes appear on a drawn syringe, drip rates as a live drip.
Share a calculation
A link with the values filled in, for teaching or a second check.
Spotted an error? Tell us.
Corrections and suggestions from nurses, students and educators make every page better.