As said before, measuring your waist with the tape is the easiest way to check belly fat. Measure your torso at the level of your navel. As per the official guidelines, measure your abdomen from just above the hip bone or the iliac crest, just where it intersects the line dropping down from the middle of the right armpit. Breathe normally while taking the measurement, and don’t hold the measuring tape too tight against the skin. Those with a waist size more than 33 inches are at risk of developing chronic heart disease.