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NASM Body Fat Calculator Online

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The NASM Body Fat Calculator is a scientifically designed tool that estimates an individual's body fat percentage based on specific body measurements. Unlike generic calculators, the NASM model incorporates unique factors tailored to gender differences, providing more accurate results. This tool aids individuals in understanding their body composition, a critical aspect of health and fitness planning. By evaluating body fat percentage, users can better gauge their fitness levels, monitor progress, and set realistic health goals.

Formula of NASM Body Fat Calculator

The accuracy of the NASM Body Fat Calculator is grounded in its reliance on established anthropometric formulas. These calculations consider gender-specific differences in body composition, offering a nuanced approach to body fat estimation.

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For Men: % Body Fat = 86.010 * log10(waist - neck) - 70.041 * log10(height) + 36.76

For Women: % Body Fat = 163.205 * log10(waist + hip - neck) - 97.684 * log10(height) - 78.387


  • waist is the circumference of the waist in inches.
  • neck is the circumference of the neck in inches (for men and women).
  • hip is the circumference of the hips in inches (for women only).
  • height is the height in inches.

Table for General Terms

To facilitate the calculator's use and enhance understanding, a table of general terms and related calculations is provided. This table includes common conversions and terms frequently encountered when using the NASM Body Fat Calculator. It's designed to help users quickly reference and convert measurements without the need for additional calculations.

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Body Fat %The percentage of your body composition that is fat.
Waist CircumferenceMeasurement around the narrowest part of the waist.
Neck CircumferenceMeasurement around the base of the neck.
Hip CircumferenceMeasurement around the widest part of the hips (women only).

Example of NASM Body Fat Calculator

Consider a man with a waist measurement of 32 inches, a neck measurement of 16 inches, and a height of 70 inches. Using the formula:

% Body Fat = 86.010 * log10(32 - 16) - 70.041 * log10(70) + 36.76

This example illustrates how to apply the formula to calculate body fat percentage, emphasizing the calculator's practical utility in personal health assessments.

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Most Common FAQs

How Accurate is the Body Fat Calculator?

The Body Fat Calculator is highly accurate when used with precise measurements. Its formulas are base on extensive research and are tailor for gender-specific differences, enhancing its reliability.

Can I Use This Calculator for Children?

No, the NASM Body Fat Calculator is designed for adult men and women. It's not suitable for children due to differences in body composition and growth patterns.

How Often Should I Measure My Body Fat?

For most individuals, measuring body fat every 4 to 6 weeks is sufficient. This frequency allows you to monitor progress over time without daily fluctuations influencing the results.

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