Lean Body Mass Calculator

Calculating lean body mass provides an important measurement for anyone trying to transform or stay fit. This easy-to-use tool removes the guesswork and keeps it simple.

Lean Body Mass Calculator

Lean body mass is the amount of weight you carry that isn't body fat. It includes muscle but also bones, water, and connective tissue, among other substances. Most scales provide overall body weight but little else regarding the actual composition of that weight.

Enter the Bodybuilding.com Lean Body Mass Calculator. It requires two inputs from you: total body weight and body-fat percentage. (If you don't know your body-fat percentage, use this calculator for that, too.) Type in those values and the calculator spits out your lean body mass. It couldn't be simpler!

Lean Body Mass Calculator

Body Fat Percentage

How To Improve Your Body Composition

Lean body mass can only be increased through resistance training, of the sort outlined in Lee Labrada's Lean Body 12-Week Trainer. Over 12 weeks, you'll follow the lead of a legendary bodybuilder, learning how to lift weights, perform cardiovascular training, and eat healthfully. The weight workouts, combined with nutritional support, especially protein, are what will build lean body mass.

This comprehensive training program is for anyone—man or woman, beginner or advanced—who is ready to work hard, train smart, and achieve a dream lean body. It includes daily workouts with technique guidance from fitness expert Lee Labrada!Go Now!

Why is it important to know how much lean body mass you have? For one thing, your body-fat percentage is a better indicator of overall health and fitness than the scale alone. Body mass index (BMI) charts often erroneously list muscular individuals as obese—even though they have a low body-fat percentage—simply because they have more lean body mass.

You can also use your lean body mass as a benchmark for assessing progress so you can fine-tune your macronutrients to build muscle. Many calculators use it in determining how many grams of protein you need to maintain and build muscle.

Yes, you do need to eat more calories to build muscle, but eating alone won't do the trick. Resistance training creates microtears in the muscle fibers, which your body then repairs to create bigger, stronger muscles.

Once you know your body-fat percentage and lean body mass, calculate your calorie needs with our calorie calculator. Remember that to lose weight you need to create a calorie deficit, and to gain weight you need a calorie surplus, but to gain muscle you need to add resistance training.

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