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BMI Calculator

Calculate your Body Mass Index. Supports metric and imperial units. BMI categories and healthy weight range. Free BMI calculator.

Live·100% in your browser — no upload

What is BMI Calculator

The BMI Calculator computes the Body Mass Index from weight and height, in metric or imperial units, and shows the reference range (underweight, normal, overweight, obese) and the healthy weight range for your height.

The calculation happens in the browser: your data is not saved or sent.

How it works

  1. Choose the units (metric or imperial).
  2. Enter weight and height.
  3. Read your BMI and the matching range.
  4. Check the healthy weight range shown.

Frequently Asked Questions

What is BMI and how is it read?
It is the ratio of weight to height squared. As a general reference: under 18.5 underweight, 18.5-24.9 normal, 25-29.9 overweight, 30 or more obese.
Is BMI always accurate?
It is a general indication and does not distinguish muscle from fat, so for athletes it can be misleading. For a precise assessment consult a doctor.
Is my data saved?
No. The calculation is entirely local, in the browser.

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