Free tool

BMI Calculator

Body Mass Index — a quick screening metric for weight categories relative to height.

Height180 cm
120 cm220 cm
Weight80 kg
40 kg180 kg
Your BMI24.7
Normal
Healthy range59.981 kg
1418.525303542

BMI doesn't distinguish between muscle and fat. If you lift weights, try the FFMI calculator instead.

Track your weight, body fat, and more — automatically.

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Frequently asked questions about BMI

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is classified as obese. Keep in mind BMI does not distinguish between muscle and fat mass.

Is BMI accurate for athletes?

No. BMI overestimates body fat in muscular individuals because it only accounts for weight and height, not body composition. If you lift weights, FFMI is a better metric. Try the FFMI calculator.

How is BMI calculated?

BMI = weight (kg) / height (m)². In imperial: BMI = weight (lbs) / height (in)² × 703.