Free calculator library

Health & fitness calculators

Simple health estimates with clear units and practical context.

BMI calculatorEstimate body mass index from height and weight.BMR calculatorEstimate resting energy needs using the Mifflin–St Jeor equation.

How to use these calculators

Choose a calculator, enter values in the units shown and select Calculate. Review both the result and the formula notes. These tools are designed for general information; local taxes, fees, lender terms and individual health factors can change what applies to you.