Body Fat Percentage Calculator

With the Body Fat Percentage Calculator, you can easily estimate the percentage of body fat in your body. Your body fat percentage indicates what portion of your total body weight consists of fat mass. Unlike BMI, body fat percentage provides more insight into your body composition.

This calculator is suitable for adults and uses a scientifically validated formula to provide a quick and reliable indication of your body fat.

What is body fat percentage?

Your body fat percentage indicates what percentage of your body weight consists of fat. A healthy body fat percentage varies by sex and age.

Example:

• A body fat percentage of 20% means that 20% of your body weight consists of fat
• The remaining 80% consists of muscles, bones, organs and fluid

Body fat percentage is often used in sports, fitness and health assessments.

Why is body fat percentage more important than BMI?

BMI only considers weight and height. It does not distinguish between:

• fat mass
• muscle mass

As a result, someone with a lot of muscle mass may have a high BMI but still a low body fat percentage. Body fat percentage therefore provides a more realistic picture of your body composition.

Formula used

This tool uses the Deurenberg formula, a widely used method for estimating body fat percentage based on BMI.

Formula:

Body fat percentage =
(1,20 × BMI) + (0,23 × age) − (10,8 × sex) − 5,4

Where:

• sex = 1 for men
• sex = 0 for women

BMI is calculated automatically based on weight and height.

Healthy body fat percentages

Men

• Essential fat: 2–5%
• Healthy: 10–20%
• High: 20–25%
• Very high: >25%

Women

• Essential fat: 10–13%
• Healthy: 18–28%
• High: 28–35%
• Very high: >35%

These values are guidelines.

How does this tool work?

You enter:

1. sex
2. age
3. height (cm)
4. weight (kg)

The tool:

• first calculates your BMI
• then uses the Deurenberg formula
• shows your body fat percentage and interpretation

Limitations of this method

The body fat percentage calculation:

• is an estimate
• does not account for muscle mass
• is less accurate for elite athletes

Use the result as an indication.

Frequently asked questions

Is this calculation accurate?
It is a reliable estimate for general use.

Is the result rounded?
Yes, to one decimal place.

Is this tool suitable for children?
No, it is for adults only.