BMI Calculator
Calculate Body Mass Index from height and weight.
BMI
Not sure which body type category you lean toward? Take the Body Type Quiz quiz.
Take the quizWhy BMI misleads for athletes
BMI is a simple ratio of weight to height, useful at a population level for screening but a poor individual measure for muscular people. A 220 lb bodybuilder at 6 feet tall can register as 'obese' on the BMI scale despite carrying very low body fat, because BMI has no way to separate muscle mass from fat mass.
If you train seriously, the body fat calculator, lean body mass calculator, or FFMI calculator will tell you more about your actual body composition than BMI alone. Curious about overall proportion rather than a single number? Try the body shape calculator, or the body type quiz if you're not sure where to start.
If your height is in centimeters, the height converter will get it into inches for this calculator.
Where these numbers come from
The formulas and default values in this calculator are based on:
- Standard BMI formula (weight in pounds / height in inches squared x 703)
- WHO adult BMI category thresholds
These are planning estimates for training purposes. Check with a coach, trainer, or physician before starting a new program or maxing out.
Frequently asked questions
Is BMI useless for athletes?
Not entirely useless, but it should be interpreted with caution for anyone carrying significant muscle mass, since BMI can't tell muscle from fat.
What BMI range is considered healthy?
18.5 to 24.9 is the standard 'normal' range, though this doesn't account for individual muscle mass, frame size, or body composition.
What should athletes use instead of BMI?
A body fat percentage measurement (see the body fat calculator) gives a far more meaningful picture of health and composition for a muscular or highly trained individual.
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