Lean Body Calculator

Use our Lean Body Calculator online to estimate your fat-free body mass accurately. Free tool for men and women to track muscle mass using weight, height & body fat.

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Enter your weight, height, and gender to estimate your lean body mass!

Formula Lean Body Mass Body Fat

Calcify's Lean Body Calculator assesses your lean body mass — the weight of everything in your body except fat (muscle, bone, organs, fluids). Knowing your lean body mass helps you gauge protein intake, set realistic strength goals, and track your progress instead of just using the scale. All of this can be helpful if you lift, play sports, or are performing body recomposition and not just “losing weight.”

For example, two people can both weigh 80 kg, but one may have more lean mass and less body fat. By entering your weight and measurements, the Lean Body Calculator gives an estimate that helps you track changes over time in a smarter way than just looking at total body weight. Use the Lean Body Calculator to watch how training and nutrition affect your body composition, and then try more strength and recovery tools on Calcify to keep improving.

FAQs

A Lean Body Calculator estimates your fat-free body mass using inputs like gender, weight, height, and body fat percentage.

Manual calculation uses formulas like Boer or James, but this free lean body calculator online simplifies the process instantly.

Yes, it’s a completely free lean body calculator with no subscriptions needed.

Absolutely! Knowing your lean body mass helps create effective fat loss strategies while preserving muscle mass.

Yes, men and women have different body compositions, which this calculator factors into its results.

It uses standard formulas like Boer, James, and Hume, depending on the input data provided.

While optional, adding your body fat percentage improves the accuracy of the lean body mass calculation.

Check your lean body mass every few weeks, especially when undergoing a body transformation program.

BMI measures weight relative to height, while spare Body Mass measures the fat-free portion of your body.

Yes, athletes frequently use lean body calculators online to track muscle gain and ensure minimal fat gain.

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