Calculate adult BMI with kg/cm or lb/ft/in and view CDC categories using the unrounded value.
Enter values, then calculate.
BMI marker on a 10–50 scale; see category text and ranges below.
How the calculation works
BMI = weight in kilograms ÷ height in meters². Imperial entries use exact unit conversions: 1 lb = 0.45359237 kg and 1 in = 0.0254 m. Confirm age 20 or older and that pregnancy is outside this tool’s scope. The category uses the unrounded result; the display uses one decimal place.
Example and verification
70 kg and 175 cm gives BMI 22.9. Tests also cover the exact boundaries 18.5, 25, 30, 35 and 40, plus a value just below 25.
Software checks cover the example, invalid input, zero or boundary cases, and reset in Chromium. No physical measurements or all-browser certification are claimed.
Scope and limitations
This is a screening calculation, not a diagnosis or treatment recommendation. It does not measure body fat or account for muscle, fat distribution or individual medical circumstances. Children, teens and pregnancy need different assessment. Discuss health concerns with a qualified healthcare professional.
Common questions
Why does 25.0 sometimes show the lower category?
A raw value such as 24.96 displays as 25.0 but remains below 25. The displayed category is based on the raw value.
Technical references
Related calculators
The calculator code processes your entries in this browser; it does not transmit or store them. Site analytics and advertising are governed separately by the site privacy policy.
Maintained by GadgetsFocus. Updated 2 October 2026 with AI-assisted writing and translation review; no human native-speaker or clinical review is claimed.