The scale shows total weight. Body fat percentage shows how much of that weight is fat vs. lean tissue — often a more useful number than BMI alone if you are building muscle or losing fat.
Why body fat matters
Two people can share the same BMI but different body composition. Higher body fat — especially around the abdomen — is linked to greater metabolic and cardiovascular risk in many studies.
Tracking body fat over months (not days) helps you see whether weight loss is mostly fat or muscle.
Method 1: Tape measure (US Navy formula)
Measure with a flexible tape, standing relaxed:
- Neck — narrowest point below the larynx
- Waist — at navel level, not sucked in
- Hips (women only) — widest point
Enter measurements in our Body Fat Calculator for an estimate. Accuracy is typically within 3–4% of professional methods for most people — good enough for trends.
Method 2: BMI-based estimate (no tape)
If you do not have a tape measure, a formula using BMI, age, and sex gives a rough estimate. Less accurate, but useful as a starting point — available in the same calculator.
General body fat reference ranges
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletes | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
Individual targets vary. Health is not defined by reaching “athlete” levels.
How to lower body fat safely
- Moderate calorie deficit — use our Calorie Deficit Calculator
- Adequate protein — protects muscle during weight loss (Protein Calculator)
- Resistance training — preserves lean mass
- Daily movement — walking adds up (Walking Calories)
Aim for 0.5–1% body fat loss per month as a sustainable pace — not crash diets.
Professional options
DEXA scans, hydrostatic weighing, and some bioimpedance devices are more accurate. Worth considering if you are training seriously or your doctor recommends closer monitoring.
When to see a doctor
Very low body fat can disrupt hormones and immunity. Rapid loss without trying, or inability to gain healthy weight, also deserves medical evaluation.
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Medical disclaimer: This article is for general information only and does not replace advice from your doctor or qualified health professional.