An InBody result sheet packs a lot of numbers into a single page, and most of them are more useful than the basic weight reading on your bathroom scale. The sheet breaks your body into its core components: water, muscle, and fat, then scores how those components are distributed across your arms, legs, and trunk. Here’s how to read each section so the numbers actually mean something.
Body Composition Analysis
The top section of most InBody result sheets shows three foundational measurements: total body water, lean body mass (also called fat-free mass), and total weight. These stack on top of each other because they’re nested. Your lean body mass includes your total body water plus the weight of your bones and protein. Your total weight is your lean body mass plus your body fat. Think of it as a set of building blocks showing what your weight is actually made of.
The horizontal bar graphs next to each value show where you fall relative to a normal range for your height. A bar that extends well past the 100% mark for lean mass but stays within range for fat mass, for example, tells you that your higher-than-average weight is coming from muscle rather than excess fat.
Muscle-Fat Analysis
This section gives you three bar charts side by side: weight, skeletal muscle mass, and body fat mass. The relationship between these three bars is where the real insight lives. If your skeletal muscle bar extends further to the right than your body fat bar, you have a favorable muscle-to-fat ratio regardless of what your total weight says. The classic “skinny fat” pattern shows a weight bar near or below average, a short skeletal muscle bar, and a body fat bar that reaches further right. Someone who is muscular and heavy will see both weight and muscle bars extending right while body fat stays moderate.
Comparing these bars over multiple scans is one of the most practical uses of the InBody. If you’re strength training, you want to see the skeletal muscle bar growing while the fat bar shrinks or holds steady, even if total weight doesn’t change much.
Segmental Lean Analysis
This section divides your body into five segments: right arm, left arm, trunk, right leg, and left leg. Each segment gets two numbers. The top number is your actual lean mass in that segment (in pounds or kilograms). The bottom number, shown as a percentage, tells you how your lean mass compares to the ideal for someone of your weight. A reading of 100% means you’re carrying exactly the expected amount of lean tissue in that limb. Below 100% suggests that segment is underdeveloped relative to the rest of your body.
This is especially useful for spotting imbalances. A right arm at 112% and a left arm at 95% suggests a meaningful asymmetry that could be addressed with targeted training. Rehabilitation patients use this section to track whether an injured limb is regaining muscle compared to the healthy side.
Body Fat and Visceral Fat
The result sheet typically reports body fat percentage and, on most InBody models, a visceral fat level. Body fat percentage is straightforward: it’s the proportion of your total weight that comes from fat tissue. Healthy ranges vary by age and sex, but general benchmarks are roughly 10 to 20% for men and 18 to 28% for women.
Visceral fat level is reported on a numerical scale rather than as a percentage. This number reflects the fat packed around your internal organs in the abdominal cavity, which carries more metabolic risk than fat stored under the skin. On comparable bioimpedance devices, a rating between 1 and 12 indicates a healthy level, while ratings of 13 and above signal excess visceral fat associated with higher risk of cardiovascular and metabolic problems. If your overall body fat percentage looks reasonable but your visceral fat level is elevated, it’s worth paying attention to, because this type of fat responds well to aerobic exercise and dietary changes even before total weight drops significantly.
Water Balance: The ECW/TBW Ratio
One of the more overlooked sections is the extracellular water to total body water ratio (ECW/TBW). The InBody uses multiple electrical frequencies to distinguish between water inside your cells and water outside them. Low-frequency currents only travel through extracellular water, while high-frequency currents pass through both compartments, and the device uses that difference to calculate the ratio.
A healthy ECW/TBW ratio generally falls around 0.360 to 0.390. When the ratio climbs above roughly 0.390, it suggests a higher proportion of water is sitting outside your cells, which can indicate swelling, inflammation, or fluid retention. This doesn’t necessarily mean something is wrong. A hard workout the day before, a high-sodium meal, or menstrual cycle changes can temporarily push the ratio up. But a consistently elevated ratio over multiple scans is worth discussing with a healthcare provider, as it can reflect chronic inflammation or nutritional deficiencies.
Basal Metabolic Rate
Near the bottom of the sheet, you’ll find your basal metabolic rate (BMR), the number of calories your body burns at rest just to keep basic functions running: breathing, circulating blood, maintaining body temperature. The InBody calculates this from your body composition data along with your age, sex, and height. Because it factors in your actual lean mass rather than just your weight, it tends to be more personalized than generic online BMR calculators.
Your BMR is not your daily calorie budget. It’s your floor, the energy cost of doing absolutely nothing. Most people burn 1.3 to 1.7 times their BMR in a typical day depending on activity level. If your InBody shows a BMR of 1,500 calories and you’re moderately active, your actual daily expenditure is closer to 2,000 to 2,250 calories. Use the BMR as a starting point for building a nutrition plan, then adjust based on your goals: a modest deficit for fat loss, a surplus for muscle gain.
How to Track Changes Accurately
A single InBody scan gives you a snapshot. The real value comes from comparing scans over time, but only if testing conditions are consistent. Small differences in hydration, meal timing, or recent exercise can shift your readings enough to mask or exaggerate actual changes in body composition.
For the most reliable comparison between scans, follow a few guidelines each time:
- Don’t eat for 3 to 4 hours before testing.
- Skip caffeine on the day of your test, as it acts as a diuretic and alters fluid distribution.
- Avoid exercise for 6 to 12 hours before the scan, since blood flow shifts to working muscles can temporarily inflate lean mass readings in certain segments.
- Hydrate well the day before but don’t chug water right before stepping on.
- Skip showers and saunas beforehand, as heat exposure changes skin conductivity and fluid levels.
Testing at the same time of day, under the same conditions, every 4 to 8 weeks gives you the clearest picture of whether your training and nutrition are producing real shifts in muscle and fat. Scanning more frequently than every few weeks often just captures normal daily fluctuations rather than meaningful trends.
Numbers That Matter Most
With so many data points on the sheet, it helps to know where to focus. For general fitness, the most actionable numbers are skeletal muscle mass, body fat percentage, and the segmental lean analysis. These tell you whether you’re gaining muscle, losing fat, and doing so evenly across your body. For health screening, visceral fat level and the ECW/TBW ratio add a layer of insight that weight and BMI alone can’t provide. And for nutrition planning, your BMR gives you a personalized starting point that accounts for your actual lean tissue rather than population averages.
The numbers on your result sheet aren’t grades. They’re coordinates, telling you where you are so you can decide where you want to go and whether what you’re doing is getting you there.