実用

Body Fat Calculator

単位:

性別：

Height (cm)

Neck (cm)

Waist (cm)

🌐

Detailed Guide Coming Soon

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

とは何か Body Fat Calculator?

▾

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.

公式

▾

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

変数の説明

▾

記号	名前	単位	説明
%BF	Body fat percentage	%	—
W	Waist circumference	cm	—
H	Height	cm	—
N	Neck circumference	cm	—

方法 Body Fat Calculator

▾

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

解いた例

▾

例 1

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

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

実際の応用

▾

🏗️

Fitness tracking and progress monitoring

🔬

Athletic performance assessment

📊

Health risk evaluation

🏥

Nutritionist consultation baseline

Body Fat % Categories (ACE)

▾

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%+

よくある質問

▾

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.

参考文献

›Body fat — American Council on Exercise

情報提供のみを目的としています。このツールは専門的な医学的助言、診断、治療の代わりにはなりません。必ず資格を持つ医療専門家にご相談ください。

Formula-verified for precision

Reviewed October 2026

Our methodology

Ratings & comments

…

Get Weekly Math Tips

Join 12,000+ subscribers who get calculator tips every week.

🔒

100% 無料

登録不要

✓

正確

検証済み数式

⚡

即座

即座に結果を表示

📱

モバイル対応

全デバイス対応

Body Fat Calculator