BMI calculator
Calculate body mass index from height and weight and see its WHO weight category.
BMI calculator
Paste a height and weight as "height;weight" — one entry per line — and this tool calculates the body mass index (BMI) and classifies it into a WHO weight category: underweight, normal weight, overweight, or obesity class I, II or III. Multiple lines are processed as a table, one BMI and category per row, which makes it handy for checking several people, or several dates on a weight-tracking log, at once.
Switch between metric (centimetres and kilograms) and imperial (feet-inches and pounds) with the units option; imperial height accepts a plain number of inches or a feet'inches notation like 5'10. Turn on "Show healthy weight range" to see the weight span that keeps that height inside the normal BMI band, and "Show BMI Prime and WHtR" to add BMI Prime — your BMI divided by the upper limit of normal — and, when a line supplies a third field for waist size, the waist-to-height ratio. Decimal places set the rounding, and the output format switches between a plain sentence, a labeled table block, or CSV per entry.
The tool handles Windows (CRLF) and Unix (LF) line endings alike, skips blank lines, and names the line number if an entry isn't valid. The tally above the output shows how many entries were calculated and the resulting BMI, or the average across several entries. BMI is a screening measure only — it ignores muscle mass, bone density, age and sex — and every result carries a reminder that it doesn't replace a medical exam.
Everything runs locally in your browser; no height, weight or waist measurement is ever uploaded. Copy the result, download it as a .txt file, or send it to another tool's input to continue working with it.