Step 1: Hang your right arm at your side, and have someone find the point halfway between your shoulder and elbow, on the rear (triceps side) of your arm. Step 2: With his/her thumb and forefinger have him/her pinch a fold of skin and fat away from the muscle.
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Adipose tissue serves a number of important functions. It's primary purpose is to store lipids from which the body creates energy. It also secretes a number of important hormones. Having an excess of body fat leads to the condition of obesity, and that can be unhealthy.
http://www.calculator.net/body-fat-calculator.html
Figure A - (the circumference of your waist x 4.15) = lean body weight. (Total weight-lean body weight) x 100. Divide this result by your total weight, and this is your body fat percentage. If you are a woman, do these calculations:
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Body fat can be estimated from body mass index (BMI), a person's mass in kilograms divided by the square of the height in meters; if weight is measured in pounds and height in inches, the result can be converted to BMI by multiplying by 703. There are a number of proposed formulae that relate body fat to BMI.
https://en.wikipedia.org/wiki/Body_fat_percentage
(Total weight-Lean Body Mass) x 100. Divide this result by your total weight, and this is your body fat percentage. Use online calculators. Many web sites offer free body mass index calculators. All you have to do is input your measurements, and the web site will do the math for you!
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Instructions. Use the quick formula. Multiply your weight by 703. Figure out your height in inches, and square it. (In other words, multiply your height in inches by itself. If you are 60 inches tall, you would calculate 60 x 60.) Divide your weight number by your height number.
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Use one of these simple methods! When losing fat, it is important to know not just how much weight you are losing, but how much of your body is muscle and how much is fat. You want to lose fat while maintaining or even building muscle. So, you need some way to keep track of your body fat percentage. The following are two simple methods to determine current body fat percentage and lean mass percentage.
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As a result, different body fat percentages will be provided with the same health assessment for both genders. For women between age 20 and 40, 19% to 26% body fat is generally good to excellent. For women age 40+ to 60+, 23% to 30% is considered good to excellent. For men between age 20 and 40, 10% to 20% body fat is generally good to excellent. For men age 40+ to 60+, 19% to 23% is considered good to excellent. If the body fat percentages for both age groups are higher than the highest listed healthy percentage or lower than the lowest healthy percentage, the result may be considered fair or poor. As such, seeking a way to lose fat is necessary.
https://www.healthstatus.com/calculate/body-fat-percentage-calculator
Body Fat Calculator. Determine your body fat percentage with our body fat calculator. Use a tape measure to determine your waist, hip and neck circumference. Then input your gender and measurements below to receive a body fat index based on average values.
http://www.active.com/fitness/calculators/bodyfat/
Essential body fat is necessary to maintain life and reproductive functions. The percentage of essential body fat for women is greater than that for men, due to the demands of childbearing and other hormonal functions. The percentage of essential fat is 3–5% in men, and 8–12% in women (referenced through NASM).
https://en.wikipedia.org/wiki/Body_fat_percentage
how to figure percentage of body fat
To calculate your body fat, first multiply the circumference of your waist  by 4.15, the result will be lean body weight then multiply total weight-lean body weight by 100 and then divide this result by your total weight, and this is your body fat percentage.