Summary
Use adult BMI as a quick screening reference — not a diagnosis, body-fat measurement, or fitness score. Muscular build, pregnancy, age, and some health conditions change how the number should be read.
Calculation details
BMI is an adult screening reference. It does not directly measure body fat and can be less informative during pregnancy or for children, muscular people, and some older adults. Treat the category label as a conversation starter with a clinician, not a verdict.
Formula
BMI = weight in kilograms / height in metres squared.
Worked example
BMI worked example
70 kg and 175 cm gives a BMI of about 22.9.
How it works
Enter adult weight in kilograms and height in centimetres. The calculator divides mass by height in metres squared, then maps the BMI to a standard adult screening category. Read the result with the limitations below — muscular build, pregnancy, and age can change interpretation.
Frequently asked questions
Is this a medical diagnosis?
No. It is an educational estimate and cannot diagnose a condition or replace individualized professional advice.
Why can my actual result differ?
Body composition, age, pregnancy, and muscular build change how BMI should be interpreted.
When is this calculator most useful?
Use it as a quick adult screening reference before a clinician conversation, not as a body-fat measurement.
How are results rounded?
The calculation retains full precision; centralized display formatting rounds only the visible result.