BMI Calculator

Free BMI calculator. Calculate your Body Mass Index in metric or imperial units and see which weight category you fall into.

How the BMI Calculator works

BMI measures body mass relative to height squared. In metric units it divides weight in kilograms by the square of height in meters. The result is mapped to WHO categories: underweight, normal, overweight, or obese.

Formula

BMI = weight(kg) / height(m)²

How to use the BMI Calculator

  1. 1The BMI calculator is designed to be simple and fast.
  2. 2Enter your height.
  3. 3Enter your weight.
  4. 4Read your BMI and category.
  5. 5Your result is shown immediately.

Examples

  • 70 kg, 175 cm = BMI 22.9 (Normal)
  • 180 lb, 5ft 9in = BMI 26.6 (Overweight)

Benefits

  • Completely free with no signup required.
  • Runs entirely in your browser for instant results and privacy.
  • Works on mobile, tablet and desktop.
  • Results can be copied with one click.

Frequently Asked Questions

Is the BMI calculator free to use?

Yes. The BMI calculator is 100% free, with no signup, no watermark and no hidden limits.

Does the BMI calculator store my data?

No. All calculations and processing happen locally in your browser. Nothing is uploaded to a server.

Does the BMI calculator work on mobile?

Yes. The BMI calculator is fully responsive and works on phones, tablets and desktop computers.

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is considered normal. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

Is BMI accurate for athletes?

BMI does not account for muscle mass. Very muscular people may have a high BMI but low body fat. Use the body fat calculator for a more accurate measure.

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