BMI Calculator

BMI Calculator

Body mass index (BMI) is a quick screening measure computed from height and weight alone: weight in kilograms divided by the square of height in metres. Enter your height and weight and the calculator shows your BMI instantly, with no upload of any kind.

Two standards side by side

The same BMI value can mean different things in different countries, so the tool classifies your result against both systems at once:

• WHO international: under 18.5, normal 18.5–24.9, overweight 25–29.9, then three obesity classes from 30 upward.
• China (WS/T 428): the overweight threshold starts earlier at 24 and obesity at 28, reflecting different health risks in Asian populations.

Your current class is highlighted in both tables, and the selected standard drives the color band, badge, and healthy weight range above.

The category band

A color band from BMI 14 to 42 shows every class and where your value lands, with a marker you can read at a glance. Below it, the healthy weight range for your height is shown in kilograms or pounds, plus how far you are from that range — the same advice in either unit system.

Metric or imperial

Switch to feet/inches and pounds and every input converts in place; the calculation itself always runs in metric, so results match exactly between the two modes.

Privacy and limits

Everything is computed locally in your browser. Nothing is uploaded or stored unless you turn on data remembering for this tool. BMI is a population-level screening hint, not a diagnosis: it does not apply to pregnant women, growing children and teenagers, or people with unusually high muscle mass.