Considered the healthy ideal for most active adults. Associated with lower disease risk and good cardiovascular fitness.
Fitness-level body fat (ACE) is considered the healthy ideal for most adults.
Navy Method: 14.6% · BMI Estimate: 19.8%
To reach 15.5% body fat, you need to gain approximately 0.8 kg of fat
Projected weight at goal: 70.8 kg
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Men: BF% = 495 ÷ (1.0324 − 0.19077×log10(waist−neck) + 0.15456×log10(height)) − 450Women's formula includes hip circumference, as fat distribution differs from men.
Women: BF% = 495 ÷ (1.29579 − 0.35004×log10(waist+hip−neck) + 0.22100×log10(height)) − 450The Body Fat Calculator uses peer-reviewed equations (WHO, Mifflin-St Jeor, Harris-Benedict, or domain-specific standards). Results are general wellness estimates, not medical diagnoses.
Metric = f(height, weight, age, activity, …)Updated: July 2026
A gym member tracks body composition alongside weight during a training program.
→ Body fat: ~18% (fitness range)
Estimating body fat for a health check when DEXA scan is unavailable.
→ Body fat: ~28% (average range)
A gym member records height and weight in the Body Fat Calculator to establish a baseline BMI and revisits monthly to track progress toward a goal.
Waist: narrowest point or at navel level. Neck: below larynx, sloping down. Hip (women): widest point. Inconsistent measurement points skew results by 3–5%.
The Navy method has ±3–4% error compared to DEXA. Use it for tracking trends over time, not as an absolute diagnostic measurement.
Use our free Body Fat Calculator for fast, accurate results in your browser. No signup or installation required — works on any device.