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Body Fat Calculator

Jednotky:

Pohlavie:

Height (cm)

Neck (cm)

Waist (cm)

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What is Body Fat Calculator?

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A body fat percentage calculator estimates fat mass as a proportion of total body weight using skinfold measurements, circumference methods (US Navy), or BMI-derived formulas.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Vzorec

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f(x)

US Navy (men): %BF = 86.010×log(waist−neck) − 70.041×log(height) + 36.76; (women): 163.205×log(waist+hip−neck) − 97.684×log(height) − 78.387

Variable Legend

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Symbol	Meno	Jednotka	Popis
%BF	Body fat percentage	%	—
W	Waist circumference	cm	—
H	Height	cm	—
N	Neck circumference	cm	—

How to Body Fat Calculator

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1US Navy method (men): 86.010×log(waist−neck) − 70.041×log(height) + 36.76
2US Navy method (women): 163.205×log(waist+hip−neck) − 97.684×log(height) − 78.387
3Jackson-Pollock: uses skinfold caliper measurements
4DEXA scan is the gold standard but requires clinical equipment

Worked Examples

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Example 1

Given:Male, waist 85cm, neck 38cm, height 178cm

Výsledok:Body fat ≈ 86.010×log(47) − 70.041×log(178) + 36.76 ≈ 17.5%

Real-World Applications

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Fitness tracking and progress monitoring

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Athletic performance assessment

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Health risk evaluation

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Nutritionist consultation baseline

Body Fat % Categories (ACE)

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Category	Men	Women
Essential fat	2–5%	10–13%
Athletes	6–13%	14–20%
Fitness	14–17%	21–24%
Acceptable	18–24%	25–31%
Obese	25%+	32%+

Frequently Asked Questions

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What's a healthy body fat percentage?

Athletes: 6-13% (male), 14-20% (female). Fitness: 14-17% (male), 21-24% (female). Varies by age and sport.

Is BMI the same as body fat %?

No. BMI = weight/height² and doesn't distinguish muscle from fat. Body fat % is more accurate for health.

How accurate is the Navy method?

Accurate within ±2-3%. DEXA scan (clinical) is more precise but requires equipment and cost.

References

›Body fat — American Council on Exercise

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Reviewed October 2026

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Body Fat Calculator