The ways of measuring fat percentage are not always exact. So many variables can skew the results. Even the gold standard — DEXA — can give inaccurate readings with two DEXA machines from the same company giving different numbers. But if there’s one fairly reliable way of judging your fat percentage by stages during your weight loss journey, especially if your end goal is the Holy Grail of sexy fitness — 6 pack abs — it is the simple eyeball test. Comparison pics of various stages of fat loss in other pilgrims can be combined with the caliper, electronic devices, or tape measure. I actually just use the pics because I don’t want to waste my time with constant measuring. And here they are. Notice that the 6 pack appears roughly at 10% body fat in men and at about 14% in women.