BMI Calculator

BMI, or body mass index, uses height and weight to estimate your weight category. This free BMI calculator gives you a quick screening result, not a complete health diagnosis.

BMI can overestimate risk for very muscular people because it does not separate muscle from fat. Pair it with body fat, measurements, and fitness context.

Use BMI as a starting point, then check calories, TDEE, and body fat before choosing a diet or workout plan.

For most people using a bmi calculator for adults, a healthy BMI range is 18.5 to 24.9. If you are wondering what is a good BMI for my age, the same adult cutoffs apply, but older adults should also consider muscle loss, mobility, and medical history.

The key bmi vs body fat percentage difference is that BMI uses only height and weight, while body fat percentage estimates how much of your body is fat tissue. BMI is simpler for screening, but body fat gives more detail about body composition.

To calculate BMI with metric units, divide weight in kilograms by height in meters squared. A bmi calculator metric and imperial tool does the same math automatically after converting units when needed.

Your BMI can change with age if your weight, height, or muscle mass changes. That is why healthy bmi range by age discussions often include context about sarcopenia, menopause, and lifestyle rather than relying on the number alone.

If you are asking what bmi is overweight, the standard adult cutoff is 25 to 29.9. Obesity begins at a BMI of 30 or higher, based on WHO classification ranges commonly used in a bmi calculator for adults.

BMI does not measure fat distribution, fitness, or muscle mass, so is bmi accurate for athletes is a valid concern. It can also be less informative for older adults, pregnant women, and anyone comparing bmi vs body fat percentage for a more complete health view.