Body Fat Percentage Calculator

The US Navy method estimates body fat percentage using circumference measurements. For men, it uses waist and neck measurements along with height. For women, it additionally requires hip measurement. The formula applies logarithmic calculations to these measurements to estimate the percentage of body weight that is fat.

For men: Essential fat is 2-5%, Athletes 6-13%, Fitness 14-17%, Average 18-24%, and Obese 25%+. For women: Essential fat is 10-13%, Athletes 14-20%, Fitness 21-24%, Average 25-31%, and Obese 32%+. Women naturally carry more essential fat for reproductive functions.

Measure your waist at the narrowest point, typically at the navel level. Measure your neck just below the larynx (Adam's apple), sloping slightly downward at the front. Measure hips (women only) at the widest point of the buttocks. Use a flexible tape measure and keep it snug but not tight.

A healthy body fat range for men is typically 10-20% and for women 18-28%. However, Asian populations including Singaporeans tend to have higher body fat at the same BMI compared to Western populations, so maintaining the lower end of these ranges may be advisable for better health outcomes.

A DEXA scan in Singapore typically costs S$150 to S$300 and provides the most accurate body composition measurement available for general public use, with an error margin of approximately 1 to 2 percent. It also breaks down fat distribution (visceral vs subcutaneous) and bone density. A DEXA is worth the cost if you are training competitively, recovering from significant body composition change, or if BMI and waist measurements give conflicting signals about your health. For casual fitness tracking, the free US Navy tape method is usually sufficient. Please verify current pricing with the specific clinic at the time of booking.

For most people, measuring once every 4 to 8 weeks is enough to track meaningful change. Body fat does not shift quickly. Daily or weekly measurements can be misleading because body fat estimates fluctuate with hydration, food intake, and measurement technique. Always measure at the same time of day, in similar conditions, and ideally before eating or drinking heavily. Trends over months are far more meaningful than any single measurement.

Women naturally carry more essential fat than men due to reproductive and hormonal functions. The minimum essential fat is around 10 to 13 percent for women, compared with 2 to 5 percent for men. Women also typically have more fat in the hips, thighs, and breasts (subcutaneous fat), while men tend to accumulate fat around the abdomen (visceral fat). This is why the Navy formula requires hip measurement for women but not for men, and why healthy ranges differ between sexes.