Medication maths calculators for clear, focused arithmetic checks
MedMaths provides free calculators for mg to mL, mg/kg doses, tablets, IV drip rates, infusion time, dilutions, BSA, ideal body weight, and Cockcroft-Gault creatinine clearance.
Start here
Common medication maths calculators
Open a focused calculator directly. Each tool shows the formula, calculation steps, result, and relevant arithmetic checks.
mg to mL Calculator
Convert a medicine dose in milligrams to mL using the supplied concentration.
Open calculatorTablet Dosage Calculator
Calculate tablet quantity from a dose in mg or from a weight-based mg/kg dose.
Open calculatorgtt/min to mL/hr
Convert an observed gravity drip count into an estimated hourly IV rate.
Open calculatorIdeal Body Weight
Calculate adult clinical ideal body weight using the Devine formula in cm or feet and inches.
Open calculatorBSA Calculator
Calculate body surface area from metric or imperial height and weight using four published formulas.
Open calculatormg/kg to mL
Calculate mg/kg per-dose or per-day orders using kg or lb, divided doses, and liquid concentration.
Open calculatorIV Drip Rate
Calculate drops per minute from mL/hr or from total volume and infusion time.
Open calculatorCreatinine Clearance
Estimate adult Cockcroft-Gault CrCl using an explicitly selected weight, with µmol/L or mg/dL serum creatinine.
Open calculatorBrowse by topic
Choose the calculation type that matches the order
Start with the units and wording in the problem. Each topic page explains which calculator fits and keeps its own colour identity.
Dose Calculations
Convert ordered doses into measurable liquid volumes using concentration, patient weight, or units/mL.
Browse topicTablet & Oral Dosing
Calculate tablets from a fixed mg dose or an optional weight-based mg/kg dose.
Open calculatorIV Fluids & Infusions
Convert between mL/hr, gtt/min, giving-set drop factor, and infusion duration.
Browse topicDilutions & Reconstitution
Work through stock dilution and final IV bag concentration calculations. Use mg to mL for vial withdrawal volume.
Browse topicDosing Body Measures
Calculate body surface area and ideal body weight for medication maths context.
Browse topicRenal Dosing Support
Estimate Cockcroft-Gault creatinine clearance with explicit weight-method selection.
Open calculatorCalculation support, not prescribing advice
MedMaths shows arithmetic and calculation methods. Always confirm the medication order, product strength, units, route, frequency, patient factors, maximum dose limits, compatibility, and local independent-check requirements before using a result.
About the library
Medical maths calculators, explained clearly
The longer educational and search information remains available without pushing the calculators down the page.
What MedMaths covers
MedMaths is a focused medical maths calculator library. It covers common medication calculation methods including dose-to-volume conversions, weight-based doses, tablet quantities, IV drip rates, infusion duration, stock dilution, final IV concentration, body surface area, ideal body weight, and creatinine clearance.
Some people search for the brand as MedMaths, while others type Med Maths. Both names refer to the same calculator library.
How to choose a calculator
Start with the unit written in the medication order. Use mg to mL for a liquid dose, mg/kg tools when patient weight is part of the order, tablet calculators for fixed oral strengths, IV calculators for mL/hr or gtt/min questions, and dilution tools for concentration-volume arithmetic or final IV concentration checks.
BSA, ideal body weight, and creatinine clearance should be used only when the relevant medicine reference or protocol specifically requires that measure.
How the pages are structured
Calculation first
The calculator, formula, result, and working appear before long educational content.
Clinical units
Labels use practical medication maths units such as mg/mL, tablets, gtt/min, and mL/hr.
Narrow scope
The site supports arithmetic checks without turning the result into a dose recommendation.
MedMaths frequently asked questions
What is MedMaths?
MedMaths is a focused medical maths calculator library for medication dose conversions, tablet dosing, IV drip rates, dilutions, body surface area, ideal body weight, and creatinine clearance.
Is Med Maths the same as MedMaths?
Yes. Med Maths is the spaced version of the MedMaths brand name. Both refer to this medication maths calculator website.
Which MedMaths calculator should I use first?
Start with the units in the medication order and product label. Use mg to mL for liquid dose volume, mg/kg tools for weight-based dosing, tablet calculators for tablet quantities, IV calculators for drip rates or infusion time, and the renal or body measure tools when a reference specifically requires CrCl, BSA, or IBW.
Does MedMaths replace clinical judgement?
No. MedMaths shows formulas and arithmetic. It does not recommend doses, validate medication orders, diagnose conditions, or replace product information, local policy, or clinical review.
Open the full calculator directory
View all 12 calculators grouped by dose, tablet, IV, dilution, body measure, and renal topics.
Browse all calculators