Lean Body Mass Calculator
Use clearly labeled inputs and visible assumptions to estimate lean mass and fat mass from body weight and body-fat percentage.
Verify this calculatorLimited scope
See what the result uses—and what it cannot know.
Sumvoro calculates deterministically from the visible inputs. It does not invent lender terms, local rules, market values, medical facts, or professional judgments.
- 1 · InputsCheck every entered value against the latest statement, quote, measurement, or official source.
- 2 · Formula
Lean body mass = body weight × (1 − body-fat percentage). - 3 · SensitivityUse Insights to run a lower and higher case. If the conclusion changes easily, collect better information or leave more margin.
- 4 · ScopeThis tool has intentionally limited scope. Read its assumptions and do not treat the output as professional advice or an exact official determination.
- Formula release
- 2026.10-r4
- Release date
- October 10, 2026
- Review status
- Limited scope
- Source review
- September 12, 2026
Optional readingLearn how this calculator works
How the lean body mass calculator works
Estimate lean mass and fat mass from body weight and body-fat percentage.
Lean body mass = body weight × (1 − body-fat percentage).
Read our calculation methodology and limitations.
Example
Start with the guided example, then replace each value with your own measurements, dates, schedule, price, or plan.
What affects the result
- Accuracy depends on the body-fat input.
- Hydration changes measured body weight.
- This is not a clinical body-composition test.
Frequently asked questions
What should I enter?
Each field explains the measurement, date component, unit, or cost expected. Keep units consistent and use current information.
Is this medical advice?
No. This is an educational estimate and does not diagnose, treat, or replace individualized medical guidance.