输入腰围与臀围，计算 WHR，并给出基础风险分级（仅供参考）。
提示：如果你在减脂/增肌阶段，建议同时跟踪腰围、体重趋势与训练表现，而不是单一指标。
WHR (waist-to-hip ratio) = waist circumference ÷ hip circumference. It's a simple proxy for fat distribution and a rough health-risk signal.
Measure waist at your chosen standard point (navel level or narrowest waist—stay consistent) and hips at the widest point. Keep the tape level and snug, not tight.
Not alone. BodyTypeCalc body-shape classification also uses bust, waist, high-hip, and hip relationships and boundary rules for a more accurate classification.