BMI Calculator
Check your body mass index with this free BMI calculator. Get your BMI category plus BMR and TDEE calorie estimates from your weight, height, and age.
BMI Calculator
Enter your numbers below and hit Calculate — the answer appears instantly, computed entirely in your browser.
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What is Bmi calculator?
BMI Calculator — Check your body mass index with this free BMI calculator. Get your BMI category plus BMR and TDEE calorie estimates from your weight, height, and age.
The math comes from the open-source fitness-calc library (MIT license): BMI is weight (kg) divided by height (m) squared; BMR uses the Mifflin-St Jeor equation; TDEE multiplies BMR by 1.55, the engine's multiplier for a "moderate" activity level. These are population-level estimates, not medical advice — talk to a clinician about your own health.
Why use this bmi calculator?
Built for bmi calculator
Check your body mass index with this free BMI calculator. Get your BMI category plus BMR and TDEE calorie estimates from your weight, height, and age.
Transparent & honest
TDEE assumes a moderate activity level — adjust up or down if you are mostly sedentary or very active.
Private by design
Everything runs in your browser. Your inputs never leave your device.
Works everywhere
Fully responsive — perfect on desktop, tablet, and mobile. No app needed.
Regularly updated
Regularly maintained and reviewed to ensure accuracy.
Free forever
No accounts, no limits, no watermarks. Use BMI Calculator as much as you need.
How to use BMI Calculator
- 1Enter your "Weight (kg)" and "Height (cm)" using your most recent measurements.
- 2Type your "Age" and choose your "Gender" from the dropdown.
- 3Run the tool to get your BMI value and its category.
- 4Read your BMR — roughly how many calories your body burns at rest each day.
- 5Read your TDEE — an estimate of your total daily calorie needs at a moderate activity level.
What can you do with BMI Calculator?
- Calculate my bmi — Check your body mass index with this free BMI calculator.
- Healthy bmi — Check your body mass index with this free BMI calculator.
- Read bmi chart — Check your body mass index with this free BMI calculator.
- Find ideal weight — Check your body mass index with this free BMI calculator.
Good to know
- TDEE assumes a moderate activity level — adjust up or down if you are mostly sedentary or very active.
- BMI does not distinguish muscle from fat; athletes and very muscular people may read as overweight.
- These are estimates, not medical advice. Talk to a clinician about your own health.
How it works
The math comes from the open-source fitness-calc library (MIT license): BMI is weight (kg) divided by height (m) squared; BMR uses the Mifflin-St Jeor equation; TDEE multiplies BMR by 1.55, the engine's multiplier for a "moderate" activity level. These are population-level estimates, not medical advice — talk to a clinician about your own health.
Examples
Status: ok — BMI 22.9 (normal), BMR 1,649 kcal/day, TDEE 2,556 kcal/day at moderate activity.
Status: ok — BMI 22.0 (normal), BMR 1,330 kcal/day, TDEE 2,062 kcal/day at moderate activity.
Status: ok — BMI 26.2 (overweight), BMR 1,755 kcal/day, TDEE 2,720 kcal/day at moderate activity.
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