The Relative Fat Mass (RFM) formula is a newer, simpler method for estimating body fat percentage that was developed to be more accurate than BMI. It only requires two simple measurements: your height and your waist circumference. This makes it an incredibly accessible tool for anyone wanting to get a quick and reasonably accurate assessment of their body fat levels without the need for calipers or expensive equipment. Use the RFM calculator to easily track your body composition progress.