BMI Calculator
Calculate your Body Mass Index from height and weight, in metric or imperial units, with the healthy weight range for your height. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example shown — replace it with your own numbers.
How the BMI calculator works
- Choose metric or imperial units, then enter your height and weight.
- Your Body Mass Index and weight category update as you type.
- The healthy weight range for your height (BMI 18.5–24.9) is calculated alongside it.
The formula
BMI is weight divided by height squared:
BMI = weight (kg) / height (m)²
Example: a person who is 170 cm (1.70 m) tall and weighs 68 kg has a BMI of 68 / 1.70² = 68 / 2.89 ≈ 23.5, in the normal range. In imperial units the same formula is BMI = 703 × weight (lb) / height (in)².
BMI is a screening measure, not a diagnosis — it doesn't distinguish muscle from fat and doesn't account for age, sex, or build. Talk to a healthcare professional for a full assessment.