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Body Fat Calculator

Body Fat Calculator

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We're working on a comprehensive educational guide for the Body Fat Calculator in your language. The content below is shown in English.

O que é 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.

Fórmula

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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

Legenda de variáveis

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SímboloNomeUnidadeDescrição
%BFBody fat percentage%—
WWaist circumferencecm—
HHeightcm—
NNeck circumferencecm—

Como Body Fat Calculator

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

Exemplos resolvidos

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Exemplo 1
Dado:Male, waist 85cm, neck 38cm, height 178cm
Resultado:Body fat ≈ 86.010×log(47) − 70.041×log(178) + 36.76 ≈ 17.5%

Aplicações práticas

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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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CategoryMenWomen
Essential fat2–5%10–13%
Athletes6–13%14–20%
Fitness14–17%21–24%
Acceptable18–24%25–31%
Obese25%+32%+

Perguntas frequentes

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Q

What's a healthy body fat percentage?

A

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

Q

Is BMI the same as body fat %?

A

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

Q

How accurate is the Navy method?

A

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

Apenas para fins informativos. Esta ferramenta não substitui aconselhamento médico profissional, diagnóstico ou tratamento. Consulte sempre um profissional de saúde qualificado.
Formula-verified for precision
Reviewed October 2026
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