BMI Calculator
Weight and height in, BMI out, with the standard range it falls in. Metric or imperial.
Example — 70 kg, 175 cmBMI = 22.86 — Healthy range (18.5 to 24.9)
How we got it — the example, step by step
- BMI = weight in kilograms ÷ (height in metres)².
- Height: 175 cm = 1.75 m. Squared: 3.0625.
- 70 ÷ 3.0625 = 22.86.
Check it backwards
22.86 × 3.0625 = 70.0 kg — back to the weight we started with.
Questions people also ask
What are the standard BMI ranges?
Underweight below 18.5; healthy range 18.5–24.9; overweight 25–29.9; obese range 30 and above. These are the WHO adult categories.
What does BMI not see?
Muscle, bone density and where fat sits. A muscular athlete can land in the 'overweight' range with very little fat. BMI is a screening number, not a diagnosis.