BMI calculator
Weight over height squared. Cutoffs change by region — pick the standard your clinic uses.
Defaults to your region. Switch to compare any other scale.
Overweight ≥25, obesity ≥30.
lb
ft
in
Result
24.1
BMI
Normal range
- Band on this standard18.5–24.9
Normal range
BMI does not separate fat from muscle. Athletes and older adults should read it with a clinician.
Formula
BMI = kg ÷ m²BMI = (lbs ÷ in²) × 703
How it is calculated
- Enter height and weight in metric or imperial units.
- BMI is weight divided by height squared (×703 if imperial).
- Read the category for the selected regional cutoff.
Questions
Why is Asian overweight 23, not 25?
WHO expert groups noted higher metabolic risk at lower BMI in many Asian populations. India, Japan, and several ASEAN guidelines use 23/25.
Is BMI a diagnosis?
No. It is a screening index. Waist, body fat, and clinical history matter more for decisions.