How it works
This adult estimate uses BMI, age, and sex as inputs. It is not a direct measurement and cannot account for muscle distribution, ethnicity, fitness, or medical conditions.
Standard formula
1.20 × BMI + 0.23 × age − 10.8 × sex − 5.4Worked example
For BMI 22.9, age 30, and the male coefficient, the estimate is about 18.18%.
Frequently Asked Questions
Is this a direct body-fat measurement?
No. It is an equation-based estimate using BMI, age, and sex.
Can athletes use it?
It may be less representative for muscular people because BMI does not separate muscle from fat.
Does it work for children?
No. This equation is intended for adults.
How can I get a more precise result?
Use a validated measurement method with qualified guidance and consistent conditions.