Health and Fitness Tools

Everyday wellness estimates for BMI, calorie needs, protein, walking calories, hydration and due dates.

BMI CalculatorCalculate body mass index from height and weight, with the standard adult BMI category.Calorie Needs CalculatorEstimate daily maintenance calories using the Mifflin-St Jeor equation and an activity multiplier.Protein Target CalculatorEstimate a daily protein target from body weight and grams per kilogram.Walking Calorie CalculatorEstimate walking calories from weight, time and pace intensity.Hydration CalculatorEstimate a simple daily water target from body weight and exercise time.Pregnancy Due Date CalculatorEstimate a due date from the first day of the last menstrual period using the common 280-day method.

Useful reads

Supporting articles and glossary pages make the tools easier to understand and give you a clearer path through the topic.

Calorie Deficit and Maintenance Guide

Research-backed article on calorie targets, activity, protein and diet planning.

Hydration Math and Daily Water Planning

Practical guide to water estimates, exercise, bottle refills and when generic targets fall short.

Pregnancy Due Date Math

Careful guide to 280-day estimates, ultrasound dating and related date tools.

Health Estimate Playbook

How to treat BMI, calorie, protein and hydration numbers responsibly.

BMI and Calorie Glossary

BMR, TDEE, BMI and calorie estimate definitions.

Fitness Math Glossary

METs, pace, protein targets and activity estimates.

Health calculator paths

Health calculators are estimates. Use them for planning ranges, then compare calorie, BMI, protein, walking and hydration tools together instead of trusting one output.

Calorie and weight planning

Use calorie, BMI, protein, walking and hydration estimates as a system.

Fitness planning pack

Compare water, walking and calorie estimates.

Hydration guide

Turn water estimates into bottle and routine planning.