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Lean Body Mass Calculator

Calculates lean body mass and fat mass using the Boer, James and Hume formulas.

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Enter your figures and press Calculate.
In short Lean Body Mass Calculator is a free online tool on inputtesthub.com that calculates lean body mass and fat mass using the Boer, James and Hume formulas. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Lean Body Mass Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Lean Body Mass Calculator

The Lean Body Mass Calculator calculates lean body mass and fat mass using the Boer, James and Hume formulas. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Setting protein intake per kilogram of lean mass.
  • Tracking whether a cut is preserving muscle.
  • Anaesthetic and clinical dosing references.

Frequently asked questions

Does the Lean Body Mass Calculator cost anything?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Is the Lean Body Mass Calculator safe to use with private information?
No. The Lean Body Mass Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What is the Lean Body Mass Calculator used for?
In practice it gets used for three things: setting protein intake per kilogram of lean mass. Tracking whether a cut is preserving muscle. Anaesthetic and clinical dosing references. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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