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Lean Body Mass Calculator

Jednotky:

Pohlavie:

Weight (kg)

Height (cm)

What is Lean Body Mass Calculator?

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Lean body mass (LBM) is total body weight minus fat mass. It includes muscle, bone, organs, connective tissue, and water. LBM is used to calculate drug dosages, set protein targets, and assess body composition beyond the limitations of BMI.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to Lean Body Mass Calculator

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1Boer Formula (most accurate): Men: 0.407W + 0.267H − 19.2; Women: 0.252W + 0.473H − 48.3
2James Formula: Men: 1.1W − 128(W/H)²; Women: 1.07W − 148(W/H)²
3W = weight in kg, H = height in cm
4Fat mass = Total weight − LBM

Worked Examples

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Example 1

Given:Male, 80 kg, 180 cm

Výsledok:LBM ≈ 63–65 kg, Fat ≈ 15–17 kg

~19% body fat

Example 2

Given:Female, 60 kg, 165 cm

Výsledok:LBM ≈ 45–47 kg, Fat ≈ 13–15 kg

~23% body fat

Healthy Body Fat % by Sex and Age

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Age	Men (healthy)	Women (healthy)
20–39	8–20%	21–33%
40–59	11–22%	23–34%
60–79	13–25%	24–36%

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Pro Tip

LBM is used in medicine to calculate drug doses (particularly for obese patients) because many drugs distribute in lean tissue, not fat. Dosing by total weight would overdose obese patients.

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Did you know?

Muscles are denser than fat (1.06 vs 0.9 g/cm³), which is why muscular people can weigh more but look leaner. Two people with the same BMI can have vastly different body compositions.

References

›Lean body mass — Wikipedia

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Deep Dive

Read the full guide on how to use this calculator effectively

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Formula-verified for precision

Reviewed October 2026

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