{ } How to use

Choose metric (kg, cm) or imperial (lb, in).
Enter your weight and height.
Select Process to see your BMI and weight category.

{ } How it works

BMI Calculator works on the options you set. Adjust the options, then select Process ▸ and it runs entirely in your browser — nothing is uploaded to a server — then shows the result in the Output panel.

Inputs

Units — choose one — Metric (kg, cm), Imperial (lb, in) (default: Metric (kg, cm))
Weight — a value (default: "70")
Height — a value (default: "175")

Output

TXT text — copy or download it from the Output panel.

{ } Common uses

Get the BMI figure a form or a clinic has asked you to supply.
See which WHO category a weight and height combination falls into.
Compare the metric and imperial calculation of the same measurements.

{ } Limitations

BMI is a ratio of weight to height and nothing more. It does not distinguish muscle from fat, so a muscular person can be classed as overweight by a figure that says nothing about their health.
The categories here are the general WHO cut-offs for adults. They do not apply to children or adolescents, who are assessed against age and sex percentiles, nor during pregnancy — and several health bodies recommend lower thresholds for people of South and East Asian descent.
It is a screening figure, not a diagnosis, and nothing here is medical advice. A number that concerns you is a reason to speak to a clinician rather than a conclusion in itself.

{ } FAQ

Is my data uploaded to a server?

No. Everything runs locally in your browser — your files never leave your device.

Can I process more than one file at once?

This tool works on one input at a time.

Is this tool free?

Yes — it’s completely free and needs no sign-up.

Does a BMI in the “normal” range mean I am healthy?

Not on its own. BMI is one crude number derived from two measurements. People inside the range can carry real health risks and people outside it can be perfectly healthy. It is widely used because it is cheap to calculate across a whole population, not because it describes any individual well.