BMI Calculator

When to use BMI Calculator

You're filling out a health insurance application that asks for your BMI, or you have a routine physical next week and want a number to bring into the conversation. Enter your weight and height — pounds and feet/inches, or kilograms and centimeters — and the calculator applies the standard formula (weight in kg divided by height in meters squared) to produce your BMI and the CDC weight category it falls in. The result comes with context: BMI doesn't distinguish muscle from fat or account for frame size, so a 200-pound powerlifter and a sedentary office worker can share the same number. Treat it as a starting point for the doctor's appointment, not a diagnosis. The math runs in your browser; your weight and height stay on your screen.

• Find your BMI before a routine physical to prep for the conversation
• Fill in a health insurance application that asks for BMI
• Track BMI monthly while working toward a fitness goal

About this tool

Enter your weight and height — imperial or metric — to get your BMI and the CDC weight category it falls into. The math happens in your browser, so nothing is logged or sent anywhere. BMI isn't a perfect measure: it doesn't account for muscle mass, frame size, or body composition, so the result includes context on how to interpret it. Useful as a starting number before a doctor's visit, an insurance form, or just curiosity — not as a diagnostic. Pure computation, no AI involved. Drop in your numbers and see where you land.