NOTE: This FFMI scale applies only to people who are relatively lean. If you can make it to a FFMI of 23-24 while staying close to 10% body fat, you’re going to look damn impressive. Getting to a lean (8-10% body fat) FFMI of around 22 is a significant achievement. The average untrained caucasian male has a FFMI of around 19. If you want to know what your FFMI is, just enter your height, weight and body fat percentage below, and the FFMI calculator will crunch the numbers for you. Some will also use it to tell if a popular fitness celebrity on YouTube or Instagram is secretly on the sauce, but pretending to be natural. The FFMI is often used to help determine the maximum amount of muscle mass it’s possible to gain without using drugs. Given that excess body fat is linked with many of the health risks associated with being overweight or obese, it doesn’t make a lot of sense to put them in the same category as someone who’s carrying around a lot more fat. Strength athletes will often have a high BMI despite the fact they’re relatively lean, mainly because they’re carrying around a lot more muscle than the typical overweight or obese individual. It’s basically the same formula used to calculate body mass index (BMI), the only difference being that the fat-free mass index uses lean rather than total body weight. The higher the number, in theory at least, the more muscular you are. It’s calculated by dividing fat-free mass (in kilograms, or kg for short) by your height (in meters squared).įFMI = fat-free mass in kg ÷ (height in meters) ² The fat-free mass index (FFMI) is a height-normalized index of fat-free mass. Let’s find out… What is the Fat-Free Mass Index (FFMI)? What is the fat-free mass index? How is it calculated? And does a FFMI of 25 really represent a natural limit to the maximum amount of muscle mass you can gain without using drugs?
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