Your BMI
—
—
- Underweight
- Below 18.5
- Healthy weight
- 18.5 – 24.9
- Overweight
- 25.0 – 29.9
- Obese
- 30.0 and above
🔒 Runs entirely in your browser — your measurements are never sent or stored.
General information only — not medical advice. BMI is a rough screening number and doesn’t account for muscle, build, age or ethnicity. For health decisions, talk to your doctor.
Using an AI agent or a script? Call this tool as an API
AI agents and scripts can call this tool directly, to check their work or look something up, and get JSON back with the same answer this page gives. No key needed.
GET https://digitalgreenhouse.com.au/api/tools/bmi-calculator?weight_kg=72&height_cm=178weight_kg— number, optional. Weight in kilograms (metric).height_cm— number, optional. Height in centimetres (metric).weight_lb— number, optional. Weight in pounds (imperial).height_ft— number, optional. Height, feet part (imperial).height_in— number, optional. Height, inches part (imperial).
The API answers from our server, and our code doesn’t store what you send. Fair-use limits apply. API guide · all endpoints (JSON) · OpenAPI
What BMI does and doesn’t tell you
Body Mass Index is your weight in kilograms divided by your height in metres squared. It’s a quick population-level screen used by health services worldwide, and it’s handy for spotting a trend. But it’s a blunt instrument: a very muscular person can read as “overweight” while carrying little fat, and it doesn’t consider where body fat sits. Treat the number as a conversation starter, not a diagnosis.