The AadiFit Body Composition Calculator estimates fat mass, lean mass, FFMI, and fat distribution using seven validated methods, not BMI alone.
Enter waist, neck, hips, and training status to estimate body fat percentage, lean mass, and FFMI, so you track recomposition beyond scale weight alone.
Add weight, circumferences, and optional body fat.
Get fat mass, lean mass, and FFMI estimates.
Compare trends beyond scale weight alone.
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Estimate body fat, lean mass, and composition trends.
Deeper analysis and coach-level protocols for Body Composition Calculator.
Direct coaching from Coach Aditya, built around your numbers.
Enter your waist, neck, hip, weight, and training status accurately, the seven-method estimate is only as good as these measurements.
Measure your true body composition: fat mass, lean mass, and muscle percentage. More accurate than BMI for tracking fitness progress and setting real goals.
Your output translates data into a decision you can apply this week.
Re-run when inputs change materially or progress stalls for two weeks.
The US Navy formula, skinfold estimates, and bioelectrical impedance scales rarely agree, and the gap can run five percentage points or more on the same body. Each method infers fat mass from a different proxy, circumference ratios, skinfold thickness, or electrical resistance through tissue, and each carries its own error band. None of them match a DEXA scan exactly, but that is not the point. Coach Aditya's recommendation: pick one method and stay with it for every retest. The absolute number matters less than whether it is moving in the right direction under consistent conditions. Pair this tool with the Muscle Target Calculator once you know which measurements are lagging.
Two people can lose the same four kilograms and end up in very different places, one loses mostly fat and keeps strength, the other loses mostly muscle and gets weaker at a lighter weight. Scale weight cannot tell you which happened. Circumference-based composition tracking can, because it separates the fat compartment from the lean compartment instead of reporting one blended number. Coach Aditya's data: clients cutting too aggressively without enough protein or resistance training often see the scale move while their FFMI barely changes, all the loss came from muscle, not fat. Check your protein target on the Macro Calculator before cutting further.
This is body recomposition, and it is the most common source of false plateaus. Muscle is denser than fat, so replacing fat with muscle at a similar rate can hold scale weight flat for weeks while waist circumference drops and visible definition improves. If your body fat percentage is falling but your weight is not, the plan is working, the scale is just the wrong instrument for the question you are asking. Coach Aditya's recommendation: track waist-to-height ratio alongside body fat percentage, and only worry about a stall if both numbers stop moving together for four straight weeks.
Daily or weekly circumference checks mostly capture water retention, sodium intake, and where you are in a training cycle, not real fat or muscle change. A four-week interval gives your body enough time to produce a signal that is bigger than the noise. Coach Aditya's recommendation: measure on the same day of the week, same time of day, before food and water, and log the number instead of reacting to it. Use the TDEE Calculator to recheck your energy target once a full four-week cycle confirms the trend.
Enter your waist, neck, and hips measurements into this tool and it estimates body fat percentage using seven validated methods including the US Navy formula and FFMI. No calipers or DEXA scan needed. Measure at the same time of day after consistent hydration for reliable comparisons over time.
For athletic women, 18 to 25 percent body fat supports performance and hormonal health. Below 16 percent can suppress the menstrual cycle. For men, 10 to 18 percent is a useful athletic range. These are performance benchmarks, not health thresholds, the right number depends on your goal, sport, and hormonal status.
BMI cannot distinguish fat mass from muscle mass. A trained athlete at 90 kg registers as obese by BMI while having 12 percent body fat. Body composition tracking separates fat loss from muscle gain, which is the only measurement that tells you whether your training and nutrition programme is actually working.
Every four weeks is ideal. Weekly measurements pick up daily water fluctuations and give misleading signals. Monthly snapshots show genuine fat and muscle trends. Take measurements on the same day of the week, at the same time, after the same meal timing, to control for variables that affect circumference readings.
Fat-Free Mass Index measures lean mass relative to height. An FFMI above 25 in men is considered the natural upper limit for drug-free athletes. For women the benchmark is around 20. Tracking FFMI tells you whether you are building genuine lean tissue during a bulk or simply adding weight with poor muscle-to-fat ratio.
Related guide: what your FFMI score means.