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BMI Calculator

Free online BMI calculator. Calculate your Body Mass Index instantly using metric or imperial units.

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Your BMI
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Your Body Mass Index (BMI) is a simple measure of body fat based on height and weight. Use this free BMI calculator to instantly find your BMI and understand what it means for your health.
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FREQUENTLY ASKED QUESTIONS
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
Is BMI accurate?
BMI is a useful screening tool but has limitations. It does not account for muscle mass, bone density, or fat distribution. Athletes may have high BMI despite being healthy.
How is BMI calculated?
BMI = weight (kg) / height (m)². For imperial: BMI = (weight in lbs × 703) / height in inches².
What is the BMI for obesity?
A BMI of 30 or higher is classified as obese. A BMI of 40 or higher is classified as severely obese.