BMI Calculator
Enter your height and weight to instantly find out your Body Mass Index — and what it means for your health.
BMI Categories
What is BMI?
Body Mass Index (BMI) is a number calculated from your height and weight that gives a rough measure of body fatness. It's used by health professionals worldwide as a quick screening tool to flag potential weight-related health risks. A BMI between 18.5 and 24.9 is generally considered healthy for adults.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². For imperial units, the formula is: BMI = (weight in lbs × 703) ÷ height in inches². The result is the same regardless of which unit system you use — this calculator handles the conversion automatically.
Why BMI has limits
BMI doesn't distinguish between muscle and fat, so athletes can test as "overweight" despite being very lean. It also doesn't account for age, sex, or where fat is distributed. Treat it as a starting point — not a verdict. Combine it with waist measurement, body fat percentage, and how you feel day-to-day.
What to do after calculating your BMI
If your BMI is outside the healthy range, the most effective lever is consistent nutrition tracking. iCalorie lets you log every meal from a photo in seconds — no manual entry, no food database. See exactly what you're eating and adjust toward your goal.
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Now track what you actually eat
BMI tells you where you are. iCalorie helps you get where you want to be — snap a photo, get calories and macros instantly.
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