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A body fat calculator is a tool that can help you estimate your body fat percentage. It works by taking into account your age, gender, height, weight, and measurements of different body parts such as your waist, hips, and neck. There are different methods for calculating body fat percentage, including the skinfold method, bioelectrical impedance analysis, and dual-energy x-ray absorptiometry.
Let's say you're a 30-year-old woman who weighs 65 kilograms, is 1.65 meters tall, and has a waist circumference of 80 centimeters, a hip circumference of 95 centimeters, and a neck circumference of 30 centimeters.
To calculate your body fat percentage using the U.S. Navy method, you would use the following formula:
Body fat percentage = (4.95 x waist circumference) - (4.5 x neck circumference) + (0.98 x height) - 308.17 / weight
Substituting the values, you get:
Body fat percentage = (4.95 x 80) - (4.5 x 30) + (0.98 x 165) - 308.17 / 65
Simplifying, you get: Body fat percentage = 28.5%
So, your body fat percentage is 28.5%.