BMI Calculator

Free online BMI calculator with WHO categories and ideal weight.

BMI BMI Calculator Interactive Tool

Height

Weight

Metric (cm / kg)

Result

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Waiting for input...

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Ideal weight (WHO)

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Normal range

The BMI Calculator computes your Body Mass Index from height and weight, classifies it using the WHO categories (underweight, normal, overweight, obesity classes), and shows a color-coded scale with your position marked on it.

It also displays the ideal weight range for a normal BMI given your height, plus the midpoint. Sliders and number inputs stay in sync, and metric/imperial units are supported. Calculation is instant and stays in your browser.