Calculator

Lean Body Mass Calculator (kg)

Metric version of the calculator, with results in kilograms.

Built by Menang7, owner of LeanMassCalculator.com

Lean Mass vs Muscle Mass →

Guide

Lean Body Mass vs Muscle Mass

Your result in kg includes more than muscle. Learn what lean body mass covers and which number to track.

Read the guide →

How it works

1Enter your detailsAdd sex, weight in kg and height in cm. Add body fat % if you know it.

2Get your numbers in kgSee lean body mass, fat mass and body fat percentage in kilograms.

3Use them to planSet a protein target and track lean mass over the coming months.

The formulas we use

Sex	Boer formula (W = kg, H = cm)
Men	LBM = 0.407 × W + 0.267 × H − 19.2
Women	LBM = 0.252 × W + 0.473 × H − 48.3

If you enter a body fat percentage, lean mass is weight × (1 − body fat %). Without it, the Boer formula gives the estimate and body fat is worked out from the difference between your weight and your lean mass.

Examples in kilograms

Sex	Height	Weight	Lean mass	Share of weight
Male	170 cm	70 kg	54.7 kg	78%
Male	175 cm	75 kg	58.0 kg	77%
Male	180 cm	85 kg	63.5 kg	75%
Female	155 cm	55 kg	38.9 kg	71%
Female	165 cm	65 kg	46.1 kg	71%
Female	170 cm	75 kg	51.0 kg	68%

Boer formula estimates for illustration. Your own body fat reading will give a more personal result.

Why use kg?

Kilograms are the standard unit in research, clinics and most scan reports, so a result in kg is easy to compare with a DXA printout or a doctor’s notes. It also keeps the formulas clean, because the Boer equation was built for kg and cm.

If you prefer pounds, the main Lean Mass Calculator on this site accepts both units.

How to build and keep lean mass

Lift with progressionTrain each muscle at least twice a week and add load over time.

Eat enough proteinAbout 1.6–2.2 g per kg of lean mass daily.

Sleep 7–9 hoursRecovery is when muscle is repaired.

Avoid crash dietsA 10–20% deficit helps you keep muscle.

Keep movingDaily walking protects muscle and bone.

Track monthlySame conditions each time. Follow the trend.

Frequently asked questions

How do I calculate lean body mass in kg?
Multiply your weight in kg by (1 − body fat %). If you do not know your body fat, use the Boer formula, which estimates lean mass from your height in cm, weight in kg and sex.

What is a good lean body mass in kg?
It depends on height and sex. At 175 cm, a typical lean mass index of 17–20 for men and 14–17 for women works out to roughly 52–61 kg for men and 43–52 kg for women.

Which formula does this calculator use?
The Boer formula, or your own body fat percentage if you enter it. For men, LBM = 0.407 × W + 0.267 × H − 19.2. For women, LBM = 0.252 × W + 0.473 × H − 48.3.

Is lean body mass the same as muscle mass?
No. Lean body mass includes muscle, bone, organs, skin and water, while muscle mass is only one part of it. Read the guide on lean body mass vs muscle mass for details.

How accurate is it?
Usually within a few kilograms. A DXA scan is more precise, so use the calculator to follow your trend over months.

Is lean mass the same as muscle mass? Read more →

🧮Lean Mass CalculatorEstimate your lean body mass from height, weight, age and sex.Open →🧮Body Fat CalculatorEstimate your body fat percentage from height, weight, age and sex.Open →📏Lean Mass Index (LMI)Lean mass divided by height squared: a fairer way to compare builds.Open →🍗Lean Body Mass Protein CalculatorTurn your lean body mass into a daily protein range.Open →💪Muscle Mass CalculatorRough estimate of skeletal muscle mass from your lean body mass.Open →📖What Is Lean Body Mass?Everything in your body that is not fat: muscle, bone, organs and water.Open →

About Menang7, the developer

This calculator is part of LeanMassCalculator.com, developed, owned and maintained by Menang7. For questions about how it works or your results, Menang7 is the person to look for.

For personal medical or nutrition decisions, please also speak with a doctor or registered dietitian.