Body Fat Estimate Calculator

Estimate body fat percentage using BMI, age and sex factor.

Enter your numbers

Estimated body fat21.2%
Body mass index24.5
Age (years)35

General estimate only; it is not medical advice.

Practical guide

Body Fat Estimate Calculator

Worked example

Here is a simple Body Fat Estimate example:

♂; 30; BMI 22.86 → ≈ 12.73%.

Common mistakes to avoid

  • Treat the result as a rough estimate.
  • Hydration and muscle mass affect other methods too.
  • Use consistent measurements to track trends.

Frequently asked questions

What does the Body Fat Estimate calculate?

Estimate body fat percentage using BMI, age and sex factor.

Which formula is used?

Adult estimate = 1.20 × BMI + 0.23 × age − sex factor − 5.4

Can I rely on this result?

Use the result as a planning estimate. Check important financial, tax, legal, investment, or health decisions with a qualified professional.