Lean Body Mass Calculator
Estimate lean mass from total weight and body fat percentage.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the lean body mass calculator result is produced.
Educational tool only. It does not replace advice from a licensed clinician, dietitian, or exercise physiologist.
Calculator inputs
Result
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What is this calculator?
This guide supports the Lean Body Mass Calculator, a focused resource for people researching lean body mass calculator results and related body metrics. The on-page tool keeps inputs simple while the sections below explain the math, a worked example, and reference ranges where they exist. Electrolyte balance interacts with sodium intake, kidney function, and sweat rate during long sessions. Sodium literacy helps with label reading: many packaged foods contribute more salt than table salt added at home. Body surface area supports teaching pharmacokinetics; real dosing follows institutional protocols. Clinical screens on educational sites should never delay emergency care when red-flag symptoms appear. Vitamin D conversions depend on compound and assay; confirm supplementation plans with a healthcare professional when deficiency is suspected. Protein grams per kilogram should scale with kidney function directives from your care team when applicable. Internal links below help search engines understand topical clusters and help readers continue their journey without friction. Caffeine sensitivity varies by genetics, pregnancy, and drug interactions; energy drinks can exceed perceived coffee equivalents. Carb and fat percent models assume calorie targets are already reasonable for your maintenance or goal phase. Ad placements are spaced so inputs and results remain readable on small screens, which supports policy-friendly layouts. Glycemic load combines portion size with carbohydrate quality; it complements—not replaces—overall diet pattern assessment. Calories per meal splits are planning aids for shift workers, athletes, and parents juggling schedules. When Lean Body Mass Calculator outputs conflict with how you feel, prioritize clinician review over any website summary.
How it works
Lean body mass (kg) ≈ weight (kg) × (1 − body fat fraction). Body fat fraction = body fat % ÷ 100.
Example
80 kg at 18% fat → LBM ≈ 80 × (1 − 0.18) ≈ 65.6 kg.
Reference Table
| Value | Meaning |
|---|---|
| Body fat % | Inherits measurement error |
| Hydration | Shifts scale weight |
| Athletes | May carry more lean mass |
FAQ
- Is LBM exactly muscle?
- Protein targets?
- DEXA preferred?
- Cutting phase?