About This Calculator
Use our free BMI calculator to instantly calculate your Body Mass Index using global systems — support handles metric centimeters and kilograms along with standard imperial feet, inches, and pounds. Find out if your weight falls within a healthy profile instantly.
All calculations are performed instantly in your browser — no tracking walls, completely free to evaluate metrics.
Frequently Asked Questions
What is a healthy BMI for adults?+
A healthy BMI for adults is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is considered obese according to CDC guidelines.
How is BMI calculated?+
For metric configurations, BMI is weight in kilograms divided by height in meters squared. For imperial measurements, BMI is calculated by multiplying weight in pounds by 703, then dividing by height in inches squared.
Is BMI accurate for everyone?+
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, age, or body composition. Athletes may have high BMI due to muscle, not fat.
What BMI is considered obese?+
A BMI of 30 or higher is classified as obese by the CDC and WHO. A BMI of 40+ is considered severely obese (Class III obesity).