Body Mass Index is your weight in kilograms divided by your height in meters squared. It is a quick screening number used to group adults into weight categories.

What is a healthy BMI range?

For adults, a BMI from 18.5 to 24.9 is generally considered the normal range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.

Is BMI accurate for everyone?

No. BMI does not measure body fat directly, so athletes with lots of muscle, older adults, and people of different ethnic backgrounds may be misclassified. Treat it as a starting point, not a diagnosis.

No. The calculation runs entirely in your browser and nothing you enter is sent to our servers.

BMI Calculator

Find your Body Mass Index in seconds, in kilograms and centimeters or pounds, feet and inches, together with your weight category and healthy weight range.

Free
No signup
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Units

Weight (kg)

Height (cm)

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Overview

Find your Body Mass Index in seconds, in kilograms and centimeters or pounds, feet and inches, together with your weight category and healthy weight range.

Benefits

Metric and imperial units
Shows your healthy weight range, not just one number
Instant result, no signup
Runs privately in your browser

Use Cases

Quick health and fitness check-ins
Tracking progress toward a weight goal
Understanding BMI categories before a doctor visit
Comparing results across unit systems

Users Also Use

How to Use

Choose metric (kg, cm) or imperial (lb, ft/in) units.
Enter your weight and height.
Click Calculate BMI to see your BMI, category, and healthy weight range for your height.

FAQ

What is BMI?: Body Mass Index is your weight in kilograms divided by your height in meters squared. It is a quick screening number used to group adults into weight categories.
What is a healthy BMI range?: For adults, a BMI from 18.5 to 24.9 is generally considered the normal range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
Is BMI accurate for everyone?: No. BMI does not measure body fat directly, so athletes with lots of muscle, older adults, and people of different ethnic backgrounds may be misclassified. Treat it as a starting point, not a diagnosis.
Is my data saved?: No. The calculation runs entirely in your browser and nothing you enter is sent to our servers.

About BMI Calculator

Our free BMI Calculator works with both metric and imperial units and shows more than a single number: you also get your weight category and the weight range that would put you in the normal BMI band for your height. The result is a general screening measure and does not replace advice from a doctor or dietitian.