Body metrics
BMI Calculator
Use this simple BMI calculator to estimate your body mass index from your height and weight. Supports both metric and imperial units.
Quick answer
The BMI Calculator estimates body mass index by comparing body weight with height. BMI is useful as a quick screening estimate, but it does not directly measure body fat, muscle mass or overall health.
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How to Calculate BMI and What It Means
Learn how BMI is calculated, what BMI categories mean, and when BMI should be interpreted with caution.
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Enter your height and weight to see your BMI score, category and estimated normal weight range.
Calculator guide
How to read your BMI result
How to use this calculator
- 1Choose metric or imperial units.
- 2Enter your height and weight.
- 3Click the calculate button to see your BMI score.
- 4Review the category and estimated normal weight range.
What the result means
BMI is a simple estimate based on height and weight. It can be useful as a quick screening number, but it does not directly measure body fat, muscle mass or overall health.
BMI formula
BMI stands for Body Mass Index. In metric units, BMI is calculated as weight in kilograms divided by height in meters squared.
Example calculation
If someone weighs 75 kg and is 180 cm tall, the height is 1.8 meters. The BMI calculation is 75 / 1.8², which equals about 23.1.
Frequently asked questions
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