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You can test body fat at home four practical ways: skinfold calipers, the Navy tape-measure method, a BIA smart scale, or a phone-based AI body scan. None match a clinical DEXA scan for precision, but any of them tracks change well if you measure consistently. The best choice depends on whether you have someone to help, how much you want to spend, and how often you plan to test.
Want to track body fat between visits? FitCommit runs an AI body scan from your phone in 60 seconds for $3.99/month, unlimited scans, free first month.
Try FitCommit FreeSkinfold calipers (plus or minus 3-8%) pinch the fat under your skin at 3-7 sites and plug the measurements into a formula. They are cheap ($10-30) and good for tracking, but accuracy depends entirely on the tester, and most sites are hard to pinch on yourself, so you usually need a partner.
The Navy method (free) uses a tape measure on your neck, waist, and hips plus your height. It takes two minutes and needs no equipment, but it is a rough estimate that ignores muscle mass, so it overestimates body fat on muscular people.
BIA smart scales ($30-100 once) send a current through your feet to estimate body fat. They are the easiest (just step on), but the least accurate at home (plus or minus 5-8%) and swing heavily with hydration. AI body scans (around $3.99/month) analyze phone photos and land near plus or minus 3-5%, the best accuracy among convenient home methods.
FitCommit integrates body scanning, food tracking, and transformation preview into one system. AI body scan measures your composition. AI food camera logs nutrition. After Photo shows your future body. All from your phone.
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Whatever method you choose, consistency beats precision. Measure at the same time of day (first thing in the morning is ideal), in a similar hydration state, before eating or working out. A reading taken under random conditions tells you almost nothing about your trend.
Track the trend, not the single number. Home methods all have a few points of error, so a one-week jump is usually noise. Look at a 2-4 week moving direction. If the line is heading the way you want over a month, the plan is working, regardless of whether the absolute number is perfectly accurate.
Do not mix methods mid-program. A caliper reading and a smart-scale reading are not comparable, so switching between them makes your data useless. Pick one and stick with it.
For most people testing at home, the friction points are needing a partner (calipers), poor accuracy (smart scales), or a rough estimate that ignores muscle (Navy method). An AI body scan removes all three: you take three photos yourself, it accounts for your whole body, and it lands at tracking-grade accuracy.
FitCommit returns body fat, lean mass, TDEE, and macros from three phone photos in under 60 seconds for $3.99/month with unlimited scans and a free first month. It is the simplest way to get a consistent weekly body-fat reading without equipment or a helper, and you can validate it against an occasional DEXA or InBody if you want a precise anchor.
Accuracy ranges and error margins on this page are stated against DEXA as the reference method and are drawn from peer-reviewed body-composition research. Every method estimates body fat through a different physical proxy (X-ray absorption, electrical impedance, skinfold thickness, or visual analysis), so absolute numbers differ between methods even on the same person, same day. Treat any single reading as an estimate with a few points of error, and track the trend under consistent conditions rather than chasing a perfect number. This is educational content, not medical advice.
Among convenient home methods, an AI body scan is the most accurate for tracking (around plus or minus 3-5%), ahead of BIA smart scales (plus or minus 5-8%) and the Navy tape method. Skinfold calipers can be accurate but only with a skilled, consistent tester.
They can be (plus or minus 3-5%) in the hands of a trained, consistent tester, but error rises to plus or minus 8% with inexperience, and most caliper sites are hard to reach on yourself. They track change well if the same person measures you each time.
Not very. BIA smart scales run about plus or minus 5-8% and swing with hydration, food, and time of day. They are better at tracking weight than body fat. If you use one, measure at the same time daily and watch weekly averages, not single readings.
Every 1-2 weeks under the same conditions. Body composition changes slowly, so daily measurement adds noise. Look at the 2-4 week trend rather than reacting to any single reading.
Deficit levels with timelines and calorie targets for fat loss
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Fasting schedules and how they affect fat loss at different body fat levels
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