30 Seconds SummaryFFMI Calculator: Calculate your genetic muscular potential
- This article explains how to calculate your maximum natural muscular potential using a Fat-Free Mass Index (FFMI) calculator based on research by Casey Butt and other scientific studies.
- The FFMI calculator is designed for natural lifters and estimates potential muscularity when six-pack lean, with less accuracy for those with higher body fat percentages.
- It includes measurements for different body parts for men, but only provides whole-body estimates for women due to limited data.
- Casey Butt's latest research offers more generalized and accurate formulas by using a larger sample size compared to earlier methods which were based on smaller, elite groups and possibly overfitted data.
- The calculations take into account body fat percentage adjustments; however, estimates are most accurate for men with body fat between 4-12%.
- Research reviewed natural bodybuilders who were drug tested and had extensive training to determine natural muscle potential, utilizing studies up to 2018.
- Statistical methods corrected the fat-free mass index for measurement errors to limit estimates to natural genetic variation.
- The article mentions findings that women, on average, have a maximum fat-free mass index of 20, approximately 80% that of men's maximum, based on comparative muscle gain rates and various athletic studies.
