BMI & Body Metrics Calculator

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Quick Summary

Calculate Body Mass Index with a visual category scale, plus your BMR and estimated daily maintenance calories by activity level — metric or imperial.

Interactive Client Prototype Sandbox

Height (cm)

Weight (kg)

Age

Sex

Activity level

Body Mass Index24.7Normal

BMR1,780 kcal/day

Maintenance2,759 kcal/day

For information only — not medical advice.

How to use the BMI & Body Metrics Calculator

Step-by-Step Guide

Pick your unit system, enter height, weight, age, sex, and activity level. The BMI, its category, your BMR, and maintenance calories update instantly.

Example80 kg, 180 cm ➔ BMI 24.7 (Normal); BMR ~1,780 kcal; moderate activity ~2,760 kcal/day.

Who it's for

People tracking fitness, dieters, gym-goers, and anyone curious about body metrics.

Core Features

BMI with a color-coded category scale (under / normal / over / obese) and a live marker.
BMR via the accurate Mifflin-St Jeor equation.
Estimated daily maintenance calories across five activity levels.
Metric (kg/cm) and imperial (lb/ft·in) input; informational, not medical advice.

🛡️ No tracking — your inputs, keys, and details never leave this client sandbox.