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Easily calculate your lean body mass with our free Lean Body Mass Calculator. Simple formulas, fast results, and easy steps to check your healthy weight.
Ever wonder what part of your weight is pure muscle, bones, and organs? That’s your lean body mass (LBM). Knowing it helps you track fitness goals and health risks. Fat can go up and down, but your lean body mass tells you the real story about strength and wellness.
That’s why we built this Lean Body Mass Calculator. You don’t need to crunch numbers on your own. Just enter your weight, height, and gender, and the tool gives you fast results with clear formulas.
Lean body mass is your body weight without fat. It includes muscle, water, bone, and vital organs. If you weigh 180 lbs and 30 lbs are fat, your lean body mass is 150 lbs. Simple, right?
It’s different from body fat percentage, but they work together. LBM shows how much of you is “active tissue.”
Your lean body mass affects how strong you feel, how fast you burn calories, and even how your body reacts to medicine. Athletes often track it to boost performance. Doctors use it to set safe drug doses.
Think of it like a car engine. A bigger, stronger engine burns more fuel. The same goes for your body. More lean mass means you burn more energy, even at rest.
There’s no single “perfect” formula, but scientists created tested ones. Our calculator uses the most trusted. Here are the main equations written in simple form:
Boer Formula
Men: LBM = 0.407 × weight + 0.267 × height − 19.2
Women: LBM = 0.252 × weight + 0.473 × height − 48.3
Hume Formula
Men: LBM = 0.32810 × weight + 0.33929 × height − 29.5336
Women: LBM = 0.29569 × weight + 0.41813 × height − 43.2933
James Formula
Men: LBM = 1.10 × weight − 128 × (weight / height)²
Women: LBM = 1.07 × weight − 148 × (weight / height)²
Janmahasatian Formula (great for high BMI)
Men: LBM = (9270 × weight) ÷ (6680 + 216 × BMI)
Women: LBM = (9270 × weight) ÷ (8780 + 244 × BMI)
That depends on your build, gender, and fitness. For men, lean body mass is usually higher because of muscle size. For women, it’s lower but just as important.
Is 160 lbs of lean mass good? For a tall, muscular man, yes. For a smaller frame, that may be very high.
Is 75% lean body mass good? Most healthy adults fall between 70% and 90%. So yes, 75% is in a healthy range.
The key is not chasing a magic number but tracking your own changes.
Using it is easy as pie.
In a blink, you’ll see results from all four formulas. You’ll also get a quick recommendation based on your BMI.
Lean body mass gives you a deeper view of health than the scale alone. Our Lean Body Mass Calculator makes it easy to check where you stand. Use it to track progress, set fitness goals, or discuss with your doctor.
Remember, numbers are tools. They help guide you, not define you. What matters most is building healthy habits and feeling good in your skin.
You can use formulas like Boer, Hume, James, or Janmahasatian. Or simply use our calculator for instant results.
It varies by height, weight, and gender. Most people range between 70% and 90% lean mass.
For a large or muscular man, yes. For smaller builds, that’s very high. Always compare within your body type.
Yes. A range of 70%–90% is common and healthy for most adults.