Skip to main content
Irreva logo
Explore Irreva

Body Fat Calculator — Estimate Body Fat Percentage Free

Estimate body fat percentage using the BMI method with age and gender inputs. Free online body fat calculator.

Estimated Body Fat

18.1%

100% Private
No Upload
Instant

What is Body Fat Calculator?

A body fat calculator estimates the percentage of your body weight that is fat. Our calculator uses the BMI-based body fat estimation formula, which takes into account age and gender in addition to BMI. Note that this is an estimate — more accurate methods include DEXA scans and hydrostatic weighing.

How to Use Body Fat Calculator

  1. 1Enter your weight and height.
  2. 2Enter your age and select your gender.
  3. 3Your estimated body fat percentage is calculated instantly.

Key Features

  • BMI-based body fat estimation
  • Age and gender adjustment
  • Body fat category classification
  • Metric and imperial units

Benefits

  • Track body composition changes over time
  • Understand healthy body fat ranges
  • Use as a starting point for fitness goals

Use Cases

Why Use Irreva for Body Fat Calculator?

Track body composition changes over time
Understand healthy body fat ranges
Use as a starting point for fitness goals
Runs 100% in your browser — files never leave your device.
No account, no sign-up, no subscription — free forever.
Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

More Calculator Tools