Enter 3 skinfold sites (mm) and age to estimate body fat % using the 3-site method.
建议每个测点测 3–5 次取平均，并尽量在相同时间/状态下重复测量以看趋势。
Tip: BIA, tape, and skinfold methods often disagree on absolute %. Pick one method, stay consistent, and watch long-term change.