BMI Calculator
Calculate your BMI in imperial or metric units for a quick adult health check.
- Runs on your device
- No watermark
- Free, no signup needed
- Available offline
How to use it
- Enter your numbers.
- Results update instantly.
- Adjust any value to compare scenarios.
Questions
How is BMI calculated?
Weight in kilograms divided by height in meters squared. In US units it is 703 × pounds ÷ inches². 160 lb at 5 ft 8 in (68 in) is a BMI of 24.3.
What is a healthy BMI?
For adults, the WHO classes 18.5 to 24.9 as a healthy weight, 25 to 29.9 as overweight and 30 or more as obesity. The calculator shows the weight range for 18.5–24.9 at your height.
Is BMI accurate?
It is a quick screening measure, not a diagnosis. It does not account for muscle, age, sex, ethnicity or pregnancy, so a doctor can tell you what your number means for you.
Can children use this BMI calculator?
No. Children and teens are assessed with age- and sex-specific BMI percentiles, so ask a pediatrician.
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