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BMI Calculator

Compute your Body Mass Index and healthy weight range, entirely in your browser.

How BMI Calculator works

The BMI Calculator computes your Body Mass Index using the standard WHO formula. Enter your weight and height in metric (kg/cm) or imperial (lb/in) units and get your BMI, your WHO category, and the healthy weight range for your height in under a second.

BMI is a population-level screening indicator, not a clinical diagnosis. Factors such as muscle mass, bone density, age and sex are not captured by BMI alone, so the results are informational only, always consult a qualified healthcare professional before making health decisions.

Frequently asked questions

Does the BMI calculator send my data anywhere?

No. Every calculation runs entirely inside your browser, your weight and height never leave your device, and the tool works offline after the page loads.

What formula is used?

Metric: BMI = kg / m squared. Imperial: BMI = 703 x lb / in squared, the formula published by the US National Institutes of Health.

What do the categories mean?

The WHO defines: Underweight (below 18.5), Normal weight (18.5 to 24.9), Overweight (25 to 29.9) and Obese (30 and above). These are reference ranges, not a clinical assessment.

Is BMI an accurate measure of health?

BMI is a simple screening indicator, not a precise measure of body composition. It ignores muscle mass, age and sex. The result is informational only, not medical advice.

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