Your weight doesn't tell the whole story. Two people can weigh the same with completely different body compositions. Use the calculator below to estimate your body fat percentage using the US Navy tape-measure method or a quick BMI-based estimate. Includes your lean body mass, fat mass, body fat category, and goal weight calculation.
Two methods. US Navy needs a tape measure (accurate). BMI uses just height/weight (rough).
Quick estimate. ±5-8% accuracy. Overestimates for muscular people. Use Navy method when possible.
The American Council on Exercise classification, most widely used in the fitness industry.
| Category | Men | Women | What It Means |
|---|---|---|---|
| Essential Fat | 2 to 5% | 10 to 13% | Minimum for basic function. Not sustainable for most. |
| Athlete | 6 to 13% | 14 to 20% | Competitive athletes. Lean and defined. |
| Fitness | 14 to 17% | 21 to 24% | Above-average fitness. Good health outcomes. |
| Average | 18 to 24% | 25 to 31% | Normal range for non-athletes. |
| Obese | 25%+ | 32%+ | Increased risk of cardiovascular disease and metabolic conditions. |
Body fat norms shift with age. Based on the Gallagher et al. study.
| Age | Healthy | Underfat | Overweight | Obese |
|---|---|---|---|---|
| 20-39 | 8 to 19% | Under 8% | 20 to 24% | 25%+ |
| 40-59 | 11 to 21% | Under 11% | 22 to 27% | 28%+ |
| 60-79 | 13 to 24% | Under 13% | 25 to 29% | 30%+ |
| Age | Healthy | Underfat | Overweight | Obese |
|---|---|---|---|---|
| 20-39 | 21 to 32% | Under 21% | 33 to 38% | 39%+ |
| 40-59 | 23 to 33% | Under 23% | 34 to 39% | 40%+ |
| 60-79 | 24 to 35% | Under 24% | 36 to 41% | 42%+ |
Women naturally carry more essential fat due to hormonal and reproductive physiology. A woman at 28% is in a healthy range; the same percentage in a man would be overweight.
| Method | Accuracy | Cost | Notes |
|---|---|---|---|
| US Navy Tape | ±3 to 4% | Free | What this calculator uses. Tape measure only. Practical and accurate enough. |
| BMI Method | ±5 to 8% | Free | Least accurate. Significantly off for muscular people. |
| Skinfold Calipers | ±3 to 5% | $10 to $50 | Accuracy depends on technique and sites measured. |
| BIA (smart scales) | ±3 to 8% | $30 to $200 | Variable. Affected by hydration and device quality. |
| DEXA Scan | ±1 to 2% | $50 to $150 | Gold standard. Also measures bone density. |
| Hydrostatic Weighing | ±1 to 3% | $40 to $100 | Underwater weighing. Very accurate. |
| Bod Pod | ±1 to 3% | $45 to $100 | Air displacement. Comparable accuracy to hydrostatic. |
Reducing body fat requires creating a caloric deficit, preserving muscle, and sustaining the behaviors. The goal is to lose fat, not just weight.
The biggest mistake is aggressive calorie restriction without resistance training. This causes muscle loss alongside fat. You end up lighter but at similar body fat percentage ("skinny fat"). Goal: reduce fat mass while maintaining or increasing lean body mass.
For men: 8 to 19% (ages 20 to 39), increasing slightly with age. For women: 21 to 32% (ages 20 to 39). The ACE "Fitness" category is 14 to 17% for men and 21 to 24% for women.
The average American man carries approximately 22 to 28% body fat, falling in the Average to borderline Obese range on the ACE scale. Varies by age and activity.
The average American woman carries approximately 28 to 36% body fat. Women naturally carry more essential fat due to hormonal and reproductive factors.
Approximately ±3 to 4% compared to gold-standard methods like DEXA. Reasonably accurate for tracking, though it can overestimate body fat in very lean individuals and underestimate it in people who carry more abdominal fat.
Yes. Body recomposition. Through resistance training and adequate protein, it's possible to simultaneously build muscle and lose fat. Most common in beginners and those with higher starting body fat.
Visible abdominal definition typically appears around 10 to 13% for men and 16 to 19% for women. Varies by individual based on fat distribution and genetics.
No. BMI is a ratio of height to weight with no direct measurement of fat or muscle. A highly muscular person can have a high BMI (classified as overweight) while having very low body fat. Body fat percentage is more meaningful.
Everything in your body that isn't fat: muscle, bone, organs, water, connective tissue. LBM = Total weight × (1 − body fat fraction). 180 lbs at 20% body fat = 144 lbs LBM.
No. The body draws on fat stores systemically, not from the area being exercised. Doing crunches does not preferentially burn belly fat. Where you lose fat is largely genetic.
We built this because most body fat calculators give you a single number and don't tell you what it means. This one categorizes you on the ACE scale, shows your lean body mass and fat mass, and calculates what you'd weigh at a target body fat percentage. This site is a part of the ads4good Network.
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