Lean Body Mass & Body Fat Calculator

BMI is Flawed, Lean Body Mass is Accurate

The Body Mass Index (BMI) only looks at your height and total weight. According to BMI, a heavily muscled bodybuilder is considered "Obese" simply because muscle weighs more than fat.

To truly understand your health, you must separate your weight into two categories: Fat Mass and Lean Body Mass (LBM).

The U.S. Navy Method

While DEXA scans are the gold standard for body fat testing, they are expensive. The U.S. Navy developed a highly accurate formula that only requires a tape measure. By measuring the circumferences of your neck and waist (and hips for women), the formula accurately estimates body fat to within 1-3% of clinical methods.

Why You Must Protect Your Lean Body Mass

Lean Body Mass includes your muscles, organs, bones, and water. When people go on extreme "crash diets," they often lose weight rapidly. However, a massive portion of that weight loss is actually Lean Body Mass (muscle).

Losing muscle destroys your metabolism. When your diet ends, your slower metabolism will cause you to gain all the fat back rapidly—this is the "yo-yo" diet effect. By tracking your LBM, you ensure your weight loss comes purely from fat stores.