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BMI Calculator

Calculate your Body Mass Index using your height and weight. This tool is intended for adults and provides a general screening estimate, not a diagnosis.

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Calculate Your BMI

Enter your height and weight below.

What is BMI?

Body Mass Index (BMI) is a screening measure calculated from a person's weight and height. For adults, it can help provide a general indication of weight category, but it does not directly measure body fat or overall health.

BMI formula

BMI = weight in kilograms ÷ (height in metres × height in metres)

For example, a person weighing 65 kg and measuring 1.70 m tall has a BMI of approximately 22.5.

Standard adult BMI categories

Below 18.5: Underweight
18.5 to 24.9: Healthy weight range
25.0 to 29.9: Overweight
30.0 or above: Obesity range

These are general adult screening categories. BMI interpretation may differ for children and teenagers, pregnancy, athletes, older adults and some populations. Speak with a qualified healthcare professional for personal medical advice.

Frequently asked questions

Is BMI a diagnosis?

No. BMI is one screening measure and should not be used alone to diagnose a health condition.

Can I use this calculator for children?

This calculator uses standard adult categories and is not intended to interpret BMI for children or teenagers.

Does BMI use pounds or inches?

This version accepts height in centimetres and weight in kilograms.

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