What is a Healthy Lean Mass Percentage for My Age?
Your lean mass percentage naturally changes as you age. See what a healthy percentage actually looks like at 20, 40, and 60, and why strength training matters more than your birthday.
Blog & Guides
Clear, evidence-based guides on Lean Mass Calculator — calculation formulas, worked examples, and the science behind the numbers. Everything you need to read your results with confidence.
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How to Increase Lean Mass Without Bulking Too Much Fat
You want to build lean mass, but you don't want to gain a tire of belly fat in the process. Learn the exact math behind lean bulking and how to put on muscle without the sloppy bulk.
Lean Body Mass Calorie Calculator: The Katch-McArdle Formula
Standard calorie calculators fail if you have high muscle or body fat. Learn how to calculate your true maintenance calories based on your lean body mass.
Lean Body Mass vs Fat-Free Mass: What is the Difference?
LBM and FFM sound exactly the same, but there is a tiny, crucial difference. Learn what separates lean body mass from fat-free mass and which one actually matters for your fitness goals.
Can Fitness Trackers Accurately Calculate Lean Body Mass?
Do Whoop, Apple Watch, and smart scales actually know how much muscle you have? We break down the algorithms, the accuracy, and what you should actually
Lean Body Mass vs. Muscle Mass: The Real Difference
People use 'lean mass' and 'muscle mass' interchangeably. They are not the same thing. Here is the exact mathematical difference and which one you should
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