BMI Calculator
Calculate your body mass index from height and weight.
BMI
24.5
BMI is a general screening measure and does not account for muscle mass, age or individual health.
v1.0 · Reviewed September 2026
How this is worked out
BMI is weight in kilograms ÷ height in metres squared.
Worked example
- 75 kg
- 175 cm
75 ÷ 1.75²
24.5
Assumptions and limits
- Height is entered in centimetres and converted internally.
- A screening measure for adults, not a diagnosis. It does not distinguish muscle from fat, so athletic builds often read high.
- The NHS notes that adults of Black African, African-Caribbean and South Asian backgrounds face increased health risks at lower BMI figures, and that BMI is not a suitable measure during pregnancy.
- Children and young people are assessed with age and sex specific centiles instead.