---
title: "Lean Body Mass Calculator — Boer & Hume Formulas | Clinical Drug Dosing"
description: "Calculate lean body mass using Boer and Hume anthropometric formulas or from body fat %. Used globally for clinical drug dosing in ICUs and oncology. Free, no ads."
url: "https://worldcalculators.org/calculators/lean-body-mass/"
canonical: "https://worldcalculators.org/calculators/lean-body-mass/"
---

# Lean Body Mass Calculator

Calculate lean body mass using Boer and Hume anthropometric formulas or from body fat %. Used globally for clinical drug dosing in ICUs and oncology. Free, no ads.

## Quick answer

LBM = Total Weight − Fat Mass. Most accurate if you know your body fat %: LBM = weight × (1 − BF%/100). Boer formula (1984) is the most widely used anthropometric estimate for clinical drug dosing. Average LBM: 75 kg man at 20% BF = 60 kg LBM. 60 kg woman at 28% BF = 43 kg LBM. This formula is used in ICUs, oncology, and anesthesia worldwide.

## Sources & Methodology

Lean body mass is estimated with the Boer, James and Hume formulas from height and weight; results differ slightly by the population each formula was derived from.

Source: https://worldcalculators.org/calculators/lean-body-mass/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.