About This Calculator
This calculator estimates your body fat percentage using the Deurenberg equation, which is based on BMI, age, and gender. It also calculates BMI and provides classification and ideal fat range by age group.
How It Works
- Select your unit system: Metric (cm, kg) or Imperial (ft/in, lb).
- Enter your gender, age, height, and weight.
- The calculator converts all values to metric and computes your BMI.
- Body fat percentage is estimated using the following formula:
BFP = 1.2 × BMI + 0.23 × Age − 16.2 (male) / 5.4 (female)
Body Fat Categories
| Category | Male (%) | Female (%) |
|---|---|---|
| Essential fat | 2–5 | 10–13 |
| Athletes | 6–13 | 14–20 |
| Fitness | 14–17 | 21–24 |
| Average | 18–24 | 25–31 |
| Obese | 25+ | 32+ |
Frequently Asked Questions
What is the Deurenberg formula?
It estimates body fat percentage from BMI, age, and gender, and is commonly used in general population assessments.
How accurate is this method?
It provides a good approximation for most adults, but it’s less precise than body composition scans like DEXA.
What body fat percentage is considered healthy?
For men, 8–24% is typical. For women, 21–35% is common. Target ranges vary with age and activity level.
Can I use this if I'm under 18?
No. This calculator is designed for adults. Children and teens require age-specific growth reference tools.