Using the US Navy Method
Measure your height. Don't wear shoes, and stand tall.
Measure your waist. For women, measure the circumference of your waist at the level with the least width, where it narrows or "pinches" in. For men, measure the circumference of your waist at a horizontal level around the navel. Don't pull your stomach in.
Measure your neck circumference. Place your tape below the larynx and sloping slightly downward to the front. Avoid flaring your neck out or flexing your neck.
Measure your hips, if you're a woman. Measure the circumference of the hips at the largest horizontal measure.
Plug the numbers into one of the formulas below, or use an online calculator. Round your answer to the nearest full percent. Formula for men, inches: %Fat = 86.010*LOG(abdomen - neck) - 70.041*LOG(height) + 36.76 Formula for men, centimeters: %Fat = 86.010*LOG(abdomen - neck) - 70.041*LOG(height) + 30.30 Formula for women, inches: %Fat = 163.205*LOG(abdomen + hip - neck) - 97.684*LOG(height) - 78.387 Formula for women, centimeters: %Fat = 163.205*LOG(abdomen + hip - neck) - 97.684*LOG(height) - 104.912
Measuring Your Waist Circumference
Strip down to your underwear or a swimsuit. Ideally, you should measure over your bare skin, but you can wear a thin shirt if necessary. To maintain consistency, wear the same clothing every time you measure.
Measure your waist. Wrap a flexible measuring tape around your waist, just above the crest of your hip bones. The measuring tape should feel snug and flat against your skin, but not so tight that it is uncomfortable. You may need a mirror to make sure the measuring tape is level and lies flat against your skin. Measure in the same location every time, and try to use the same measuring tape.
Check for health hazards. Waist circumference measurement doesn't tell you your exact percentage of body fat, but it does gives you useful relative measurements. Non-pregnant women whose waist circumference is >35 inches (89 cm), and men whose waist circumference is >40 inches (102 cm), are at increased risk of developing obesity-related conditions such as hypertension and adult-onset diabetes. If you are not expecting to be pregnant nor gaining weight, and your waist circumference is growing, contact your doctor. You may be pregnant or experiencing a medical issue.
Calculating Your Body Mass Index (BMI)
Measure your height. Don't wear shoes, and stand tall.
Measure your weight. Stand on a scale that has been calibrated and get your weight in pounds or kilograms.
Compare to a BMI table. Once you find a credible BMI table, locate where your height and weight measurements intersect. The number listed at the intersection is your BMI, or your body mass index. Get an online BMI table here. Our BMI tends to naturally rise slightly as we age. Children and Teen BMI readings: you must calculate the child's BMI using an age- and gender-appropriate table. Otherwise, the results will be inaccurate. You can also use an online calculator to calculate BMI. Click for adult and teen - child calculators.
Understand your BMI rating. Your BMI is a ratio of your body height and weight, your “mass.” Your body is made of fat, bones, blood, muscle, and many other tissues that contribute to your weight, and your BMI. Your BMI rating does not directly correlate to your percentage of body fat, but is a way to monitor your size. Below are listed ranges for medical weight classes for adults. A BMI value of <18.5 is underweight. 18.5 – 24.9 is in the "normal" range. 25 – 29.9 is overweight. >30 is considered obese. A number of extremely muscular, not fat, individuals fall in the overweight category because their muscle weighs so much. Talk to your doctor about what your BMI means for you. If you are not exercising and growing muscle mass but are gaining weight, it is likely that weight is fat. If you are exercising and eating healthily, while gaining weight, it is possible that weight is muscle and only partially fat. If you are losing weight, you are probably losing both muscle and fat.
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