How to use it
- Enter your weight in kilograms.
- Enter your height in centimeters.
- Input your age and select your sex (0 = female, 1 = male).
- Click “Calculate” to see your body fat percentage.
This tool estimates your body fat percentage using only four inputs: weight (kg), height (cm), age, and sex. Knowing your body fat helps you gauge fitness progress, tailor nutrition, and set realistic goals. The result is shown as a single percentage—lower numbers generally indicate leanness, while higher numbers suggest more fat. Use the figure as a benchmark, not a medical diagnosis, and track changes over time to see the impact of your training and diet.
Pro tips
- Use a recent weight measurement; small fluctuations can change the result.
- Round the final percentage to the nearest whole number for easier tracking.
- Enter height in centimeters, not inches, to avoid miscalculations.
- Don't rely on the number alone—combine it with fitness goals and body measurements.
Real-life examples
- A beginner gym-goer wants to set a realistic fat loss target.
- A coach needs quick body fat data for client progress reports.
- A health app developer wants to embed a free calculator for users.
Case study
Maria, 32, entered 68 kg, 165 cm, age 32, sex 0 and saw a body fat percentage of 27%. She adjusted her nutrition plan, and after three months her percentage dropped to 22%, confirming progress without expensive tests.