BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units. See the BMI category, healthy weight range, and a visual scale. Runs entirely in your browser.
Within the healthy range. Keep it up!
About BMI
Body Mass Index estimates body fat from height and weight. It does not account for muscle mass, bone density, or body composition. For daily calorie needs see theCalorie Calculator.
Secure & Private Client-Side
This tool runs entirely in your browser. No data is sent to any server, ensuring your information remains private and secure.
About BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units. See the BMI category, healthy weight range, and a visual scale. Runs entirely in your browser.
Frequently Asked Questions
What is a healthy BMI? expand_more
The World Health Organization defines 18.5 to 24.9 as the normal range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
Does BMI work for athletes? expand_more
BMI does not distinguish muscle from fat, so very muscular people can register as overweight despite low body fat. Use body composition measurements for athletic populations.
Is BMI accurate for children? expand_more
Adult BMI thresholds do not apply to children. Pediatric BMI is plotted on age- and sex-specific growth charts; consult a pediatrician.
How do I plan calorie intake? expand_more
Use the [Calorie Calculator](/tools/calorie-calculator/) to estimate BMR, TDEE, and macros for weight management.
Is my data uploaded? expand_more
No. All math runs locally in your browser.
Common Use Cases
- Health Check: Get a quick body composition estimate at home.
- Fitness Tracking: Monitor BMI changes as you lose or gain weight.
- Insurance Forms: Quickly calculate BMI for medical paperwork.
- Nutrition Planning: Pair BMI with the Calorie Calculator for goals.