Prepared by Finflo. Our methodology · Editorial policy
Check the height before interpreting BMI
At the same 70 kg, a different entered height changes BMI because height is squared. This comparison illustrates measurement sensitivity; it does not describe a change in body fat or recommend a target weight.
| Weight | Height | BMI |
|---|---|---|
| 70 kg | 1.75 m | 22.86 kg/m² |
| 70 kg | 1.8 m | 21.6 kg/m² |
The calculation
Body mass index is weight in kilograms divided by height in meters squared. For example, 70 kg and 1.75 m gives a BMI of approximately 22.86 kg/m². The arithmetic is straightforward; interpretation requires context.
Adult reference categories are screening conventions. BMI does not directly measure body fat, muscle mass, fitness, nutrition, or an individual’s overall health.
Who the adult categories are for
The adult calculator is intended for adults age 20 and older. Children and teenagers need age- and sex-specific interpretation using an appropriate growth reference, not the adult cutoffs. Pregnancy and other circumstances can also make ordinary adult interpretation unsuitable.
A screening category is not a diagnosis, a treatment plan, or a statement about personal worth. Clinicians may consider medical history, measurements, symptoms, and other evidence together.
Use an estimate as a starting point
If a result concerns you, discuss it with a qualified healthcare professional. A calculator cannot assess your personal needs or recommend a healthy target solely from height and weight.
Finflo shows the equation and its scope so you can see what was measured and what was not.