Free Body Fat Calculator-Estimate Your Body Composition

Go beyond the scale with our Body Fat Calculator. This tool provides a more accurate picture of your health than weight or BMI alone by estimating your body composition. Use our calculator to find your body fat percentage, your lean body mass, and where you stand based on fitness level categories from the American Council on Exercise (ACE).

How to Use the Body Fat Calculator

For an accurate estimate, please use a tape measure and follow these steps:

1. Select Your Units: Choose between Metric (kg, cm) or US/Imperial (lbs, in).
2. Enter Your Details: Provide your age, gender, height, weight, and neck and waist measurements. For females, a hip measurement is also required for the U.S. Navy method.
3. Choose a Method: The U.S. Navy method is recommended for its precision. The BMI method is a less accurate alternative if you do not have a tape measure.
4. Calculate: Instantly see your body fat percentage and a full composition breakdown.

Understanding the Calculation Methods

• U.S. Navy Method: This is a widely used and respected formula that uses body measurements to estimate body fat. Because it uses circumferences, it can provide a more accurate estimate of body composition than methods based solely on weight and height.
• BMI Method: This method provides a rough estimate of body fat based on your BMI, age, and gender. It is less precise because it does not account for differences in body shape and muscle mass.

Reading Your Results

• Body Fat Percentage: The percentage of your total weight that is fat.
• Body Fat Mass: The total weight of fat in your body.
• Lean Body Mass: The weight of everything else in your body, including muscle, bones, organs, and water. Increasing this number is a common goal in fitness.
• Category Table: We show you where your percentage falls on the spectrum, from essential fat to obese, based on expert guidelines.

Disclaimer: This calculator provides an estimate for informational purposes. The U.S. Navy method has a reported error margin of 1-3%. For the most accurate results, consult a professional with access to tools like calipers or DEXA scans. This tool is not a substitute for medical advice.