The Lean Body Mass Calculator is a free tool that helps you calculate lean body mass using the formula Boer formula for lean body mass. Enter your values above and press Calculate to get lean body mass, fat mass instantly, with a full step-by-step breakdown.
What is the Lean Body Mass Calculator?
The lean body mass calculator is a free online tool that helps you calculate lean body mass quickly and accurately. It applies the standard formula Boer formula for lean body mass to the values you enter and, when you press Calculate, displays the result together with a clear, step-by-step explanation of how the answer was reached.
How to use the Lean Body Mass Calculator
- Choose gender.
- Enter weight and height.
- See lean and fat mass.
Formula used
The lean body mass calculator is based on this formula:
Boer formula for lean body massEach term in the formula corresponds to one of the inputs explained below. The calculator performs the arithmetic for you and shows every step so you can check the working by hand if you wish.
Worked example
Suppose you enter Male, 70kg, 170cm. The calculator works as follows:
| Inputs | Male, 70kg, 170cm |
|---|---|
| Working | Boer formula |
| Result | LBM about 55 kg |
Step-by-step calculation
- Apply the formula:
Boer formula for lean body mass - Substitute your values: Boer formula
- Read the result: LBM about 55 kg
Inputs explained
- Gender โ the gender used in the calculation.
- Weight (kg) โ the weight used in the calculation.
- Height (cm) โ the height used in the calculation.
Understanding your result
- Lean body mass โ the calculated lean body mass in kg.
- Fat mass โ the calculated fat mass in kg.
Benefits and practical uses
The lean body mass calculator saves time and removes the risk of manual errors when you need to calculate lean body mass. It is useful for students, professionals and anyone who wants a fast, dependable answer. Results update the moment you press Calculate, work on any device, and can be copied or shared in a single click โ and because the maths runs in your browser, your figures stay completely private.
Tips for an accurate result
- Keep all related inputs in the same units.
- Use the worked example above to confirm you are entering values in the right places.
- Review the assumptions below so the result fits your situation.
- Press Reset to clear everything and try a different scenario.
Common mistakes to avoid
- Entering values in the wrong unit (mismatched units give wrong answers).
- Leaving a required field empty โ the calculator will ask you to fill it in.
- Treating the result as a diagnosis instead of a general guide.
Assumptions and limitations
- Boer (1984) formula.
Frequently asked questions
What is lean body mass?
Everything in your body except fat - muscle, bone, organs and water.
How do I use the Lean Body Mass Calculator?
Enter your values in the fields, then press the Calculate button to see the result. Use Reset to clear the form and start again. Nothing is calculated until you click Calculate.
What formula does the Lean Body Mass Calculator use?
It uses the standard formula: Boer formula for lean body mass. The full step-by-step working is shown with every result so you can verify it.
What information do I need to use the lean body mass calculator?
You need: gender, weight, height. Sensible example values are pre-filled so you can see how it works.
Is the Lean Body Mass Calculator free to use?
Yes. Every DigiToolkit calculator is completely free, with no sign-up, no login and no usage limits.
Does the Lean Body Mass Calculator work on mobile phones?
Yes. The calculator is mobile-first and works on phones, tablets and computers in any modern browser.
Do I need to install an app?
No. The lean body mass calculator runs directly in your web browser โ there is nothing to download or install.
Is my data private when I use this calculator?
Yes. All calculations run inside your browser. The numbers you enter are never uploaded to a server or shared with anyone.
How accurate is the Lean Body Mass Calculator?
It uses the generally accepted formula for lean body mass and computes to several decimal places. Results are accurate for the assumptions listed on this page.
Can I copy or share my result?
Yes. After calculating, use the Copy button to copy the result, or Share to copy the page link.
Why is nothing showing until I press Calculate?
By design, the calculator only computes when you press Calculate, so you can finish entering all your values first. Press Reset any time to clear everything.
What units does the Lean Body Mass Calculator use?
It works with cm, kg. Keep your inputs in consistent units for an accurate result.