体脂率计算器（美军公式） Body Fat Percentage (Navy)
仅通过身高和身体围度估算体脂率，来源于美军（U.S. Navy）公式，适合快速健康评估。
Estimate body fat percentage using only height and body measurements based on the U.S. Navy method.
Different formulas are applied for males and females.
Use standing height in centimeters.
Measure horizontally around the abdomen near the navel.
Measure just below the Adam’s apple.
美军体脂公式（U.S. Navy Method） 是一种基于人体围度的体脂估算方法， 不需要体重数据，广泛用于军队体能筛查和快速健康评估。 该方法假设人体脂肪分布与腰围、颈围（女性还包括臀围）之间存在稳定关系。
The U.S. Navy body fat formula estimates body fat percentage using body circumference measurements. It does not require body weight and is commonly used for military fitness assessments and quick health screening. The method assumes a consistent relationship between fat distribution and waist, neck (and hip for females) measurements.
适用场景 · When to use:
• 健身、减脂过程中的阶段性参考
• 体重变化较大但希望关注体脂趋势时
• 无法进行专业体脂检测（DEXA、BIA）的情况下
重要提示 · Important:
本工具为估算模型，结果会受到测量误差、个体差异和脂肪分布特点影响，
不应替代医学检测或专业健康评估。
This tool provides an estimation only and should not replace medical-grade body composition analysis.
