Estimate fat to lean mass ratio using clear inputs and transparent formulas, with results intended for planning and comparison.
How to use this calculator
For fat to lean mass ratio calculator, enter Body weight (kg), Body fat percentage (%) using the unit or format beside each field. Select Calculate to apply the formula below, review all returned values together, and use Reset to restore the demonstrated inputs before testing another scenario.
Formula & calculation method
fatMass = weight*bodyFat/100; leanMass = weight*(1-bodyFat/100); fatToLeanRatio = bodyFat/(100-bodyFat)Worked example
For a reproducible fat to lean mass ratio calculator example, use Body weight: 80; Body fat percentage: 20. The first returned value, fat mass, is calculated with weight*bodyFat/100; the other results describe the same scenario. Change one input at a time and keep its unit consistent when comparing scenarios.
Limitations to keep in mind
A general health or nutrition reference, not a diagnosis, treatment plan, or individual requirement. Age, pregnancy, conditions, medicines, and clinical advice can change the appropriate value.