Body Fat Calculator — Free Online Health Calculator | No Signup
Your Body Fat Percentage
--
--
Our Body Fat Calculator estimates your body fat percentage using height, weight, age, and gender. Understanding body composition helps you set realistic fitness goals and track progress beyond what the scale alone tells you.
How to Use the Body Fat Calculator
- Select units: Choose Imperial (lbs/ft+in) or Metric (kg/cm).
- Enter your details: Height, weight, age, and gender.
- Read your result: Body fat percentage with color-coded category appears instantly — no button click needed.
Body Fat Percentage Categories
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2-5% | 10-13% |
| Athletes | 6-13% | 14-20% |
| Fitness | 14-17% | 21-24% |
| Average | 18-24% | 25-31% |
| Obese | 25%+ | 32%+ |
How We Calculate Body Fat
We use the Deurenberg formula: BF% = (1.20 x BMI) + (0.23 x Age) - 16.2 for men, and - 5.4 for women. BMI is calculated from your height and weight. This is a widely accepted approximation when body circumference measurements are not available.
For higher accuracy, the US Navy method uses waist, neck, and hip measurements. Formula for men: BF% = 86.010 x log10(waist - neck) - 70.041 x log10(height) + 8.457.
Frequently Asked Questions
What is a healthy body fat percentage?
For men, 14-17% is fitness level and 18-24% is average. For women, 21-24% is fitness and 25-31% is average. Athletes typically fall below these ranges. Essential fat (minimum needed for basic function) is 2-5% for men and 10-13% for women.
How accurate is this calculator?
It provides a reasonable estimate using BMI, age, and gender. For clinical accuracy, DEXA scans or hydrostatic weighing are more precise. Use this as a tracking tool over time rather than a one-time diagnosis.
How often should I check my body fat?
Once a month is sufficient for general tracking. Measure at the same time of day for consistency. Body fat changes slowly — weekly measurements can show misleading fluctuations due to hydration and other factors.
Related Tools
BMI Calculator
Calculate Body Mass Index from height and weight.
Calorie Calculator
Find your daily calorie needs based on activity level.
Ideal Weight Calculator
Find your ideal weight range by height using medical formulas.
Weight Converter
Convert between kg, lbs, and stone instantly.
This calculator provides estimates for informational purposes only. Consult a healthcare professional for personalized advice. Sources: Centers for Disease Control and Prevention (CDC), World Health Organization (WHO).