Lean Body Mass Calculator Explained

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Last updated: January 06, 2024

LBM – Lean Body Mass Calculator

What is a LBM calculator?

The lean body mass (LBM) calculator is a simple tool for estimating an individual's lean body mass based on equations that require only basic information such as sex, age, height, and weight.

What is the lean body mass?

Lean body mass or lean body weight is the weight of your body without body fat or adipose tissue. It includes the weight of all organs, including the brain, heart, lungs, liver, kidneys, skin, and everything else except body fat.[1]

We strive to make our calculator apps as accurate as possible, but they cannot replace a professional doctor. Our website provides information for informational purposes, and it's not medical advice. Please consult your healthcare provider before making any decisions based on the results provided by our tool.

User Guide

This guide provides step-by-step instructions for using our calculator.

LBM – Lean Body Mass Calculator

How do you use a lean body mass calculator?

To calculate an estimated percentage and mass of your lean body, using our calculator, use the following steps:

  1. Check your preferred unit system.
  2. Select your gender.
  3. Enter your age.
  4. Enter your height.
  5. Enter your weight.

LBM Calculator - Input Fields

When you fill in all the required information, our LBM calculator will calculate your lean body mass and percentage. The calculator will provide a range of results, as we use three formulas to calculate lean body mass.

LBM Calculator - Results

To see the corresponding results to the formulas we use, check the table below the result section.

LBM Calculator - Formulas and Results

Calculation Features

Our calculator has some essential features to help you fill in your information and get the result as quickly as possible.

Type, Click, or Swipe

We developed the calculator to accept all interaction methods to speed up your information-filling process. In most input fields, you don't need to use the keyboard. You can use the mouse or finger to adjust the field value by swiping within a predefined range.

Assisted information-filling

More ways to adjust the value

Some calculators also offer a range of preset values, which you can quickly enter by clicking the associated button.

Preset Values

You can fill the field with preset values.

Metric or Imperial Unit

Each calculator has a unit switcher button right under the form. The calculator switches between the metric and imperial systems when you click or tap on it. All input values are converted to an appropriate target unit (e.g., cm to feet, in).

Health Calculator - Unit System Switcher

Convert values between metric and imperial systems.

Reload the form

Click the refresh icon or button under the form to calculate new information.

Health Calculator - Reload the form


Our calculator provides personalization features, allowing users to customize the user interface to match their preferences.

Change dark mode

By default, our calculator dark mode follows your system's preference. However, you can change it by opening the Settings menu and turning on/off the dark mode switch.

Health Calculator - Change Dark Mode

Open the Settings menu and toggle the dark mode switch.

Change theme color

Our calculator comes with several theme colors to match your preferences. You can change them by opening the Settings > Theme menu and selecting your favorite color.

Health Calculator - Change Theme Color

Open the Settings menu, open the Theme menu, and select a color.

LBM – Lean Body Mass Calculator

LBM – Lean Body Mass Calculator App

About this app

Our Lean Body Mass (LBM) calculator is a simple tool that calculates your total mass of all organs, excluding the body fat. Just enter your weight and height to get results from multiple formulas.

App availability

You can use the calculator for free as a PWA web app online or install it locally on any modern operating system, including Android, iOS, Windows 11/10, and macOS.

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1 Source

  1. ⬆️ Boer P. Estimated lean body mass as an index for normalization of body fluid volumes in humans. American Journal of Physiology-renal Physiology. 1984;247(4):F632-F636.