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BMI Calculator — Body Mass Index Online Free

Calculate BMI and Find Your Healthy Weight Range

Calculate your Body Mass Index (BMI) using metric or imperial measurements. See your BMI category (underweight, normal, overweight, obese) and the healthy weight range for your height.

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Seconds to process
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Files never stored
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How to Use BMI Calculator

1

Enter your weight and height

2

Choose metric (kg/cm) or imperial (lbs/ft)

3

Click Calculate BMI

4

See your BMI score and category

Frequently Asked Questions

BMI (Body Mass Index) is a measure of body fat based on height and weight. BMI = weight(kg) ÷ height(m)². It is used to screen for weight categories.
A BMI of 18.5–24.9 is considered healthy. Under 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
The BMI formula is the same, but interpretation may differ. BMI doesn't account for muscle mass, so athletes may have high BMI but low body fat.
Yes! Enter weight in kg or pounds, and height in cm or feet/inches.

Learn More

tutorial
The BMI Formula, and Why the 'Healthy Range' Isn't the Same Number Everywhere
5 min read

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