Health & Fitness · 体脂率 · Updated 2026-10-25
What Is Body Fat Percentage?
Definition
Body fat % = fat mass / total weight. Healthy ranges: ~10–20% men, 18–28% women. Home BIA scales carry 3–8% error — track trends under fixed conditions, not absolute numbers.
Formula
Fat % = fat mass / body weight × 100
Worked Example
Weight down 2kg but fat down 3.2kg over 12 weeks — the scale understates real progress.
Common Misconception
"My scale says 15% so it is 15%" - home BIA can be off by several percentage points; "lower body fat is always better" - below 8% (men) or 16% (women) long-term invites hormonal and immune problems.
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