Renpho scales measure 13 body composition metrics, and most of them show up in the app without much explanation. Understanding what each number means, what range is healthy, and which metrics actually matter for your goals makes the difference between useful data and a confusing wall of numbers.
What Each Metric Means
When you step on a Renpho scale, it sends a small electrical current through your feet. Because fat, muscle, bone, and water all conduct electricity differently, the scale estimates your body composition from that signal. This method is called bioelectrical impedance analysis, or BIA. The full list of metrics includes: weight, BMI, body fat, subcutaneous fat, visceral fat, body water, skeletal muscle, muscle mass, bone mass, protein, BMR, metabolic age, and fat-free body weight.
You don’t need to obsess over all 13. Here’s what the most important ones tell you.
Body Fat Percentage
This is the single most useful number beyond weight. It tells you what percentage of your total body weight is fat tissue. Healthy ranges differ significantly by sex. For men, 11 to 14% is considered good, 15 to 20% is acceptable, and anything above 24% falls into the obese category. For women, 16 to 23% is good, 24 to 30% is acceptable, and above 37% is obese. Athletes typically sit at 5 to 10% for men and 8 to 15% for women.
If your weight stays the same but your body fat percentage drops over several weeks, that’s a strong sign you’re gaining muscle and losing fat simultaneously. This is exactly the kind of progress that weight alone can’t show you.
Subcutaneous Fat vs. Visceral Fat
Your scale splits fat into two categories. Subcutaneous fat is the fat stored just beneath your skin, the kind you can pinch. Visceral fat is the fat packed around your internal organs in your abdomen. Of the two, visceral fat is far more important to watch. High visceral fat is linked to increased risk of heart disease, type 2 diabetes, and metabolic problems, even in people who look relatively lean on the outside.
Renpho typically rates visceral fat on a scale of 1 to 59 in the app. A reading between 1 and 9 is considered healthy. Anything from 10 upward suggests excess visceral fat worth addressing through diet and exercise. If your visceral fat number is high while your overall body fat percentage looks reasonable, that’s actually more concerning than the reverse.
Skeletal Muscle vs. Muscle Mass
These two metrics confuse a lot of people because they sound like the same thing. They’re not. Muscle mass includes all muscle in your body: your heart, your digestive tract, and every other involuntary muscle you never think about. Skeletal muscle is specifically the muscle attached to your bones that you control voluntarily. It’s what grows when you lift weights or do resistance training.
Skeletal muscle is the number to watch if you’re exercising. You don’t want to see it drop, especially during weight loss, because that would mean you’re losing the functional muscle that supports your metabolism and strength. If your overall weight is going down but your skeletal muscle percentage is holding steady or rising, your fat loss is on track.
BMR and Metabolic Age
BMR stands for basal metabolic rate. It’s the number of calories your body burns at rest just to keep you alive: breathing, circulating blood, maintaining body temperature. The Renpho app displays this as a calorie number. A higher BMR generally means your body burns more energy throughout the day, which is influenced heavily by how much muscle you carry.
Metabolic age compares your BMR to the average BMR of people at different chronological ages. If you’re 40 but your metabolic age reads 33, your body burns calories at rest like a typical 33-year-old. A metabolic age lower than your actual age generally reflects higher muscle mass and better fitness. It’s more of a fitness benchmark than a medical measurement, so treat it as a motivational data point rather than a diagnostic one.
Body Water and Protein
Body water percentage reflects how much of your weight is water. For most adults, a healthy range falls between about 45% and 65%, with men tending toward the higher end due to greater muscle mass (muscle holds more water than fat). This number fluctuates daily based on hydration, sodium intake, and hormonal shifts, so a single reading doesn’t mean much. What matters is your trend over weeks.
Protein percentage is an estimate of the protein content in your body, which closely tracks with muscle mass. If you’re strength training and eating enough protein, this number should hold steady or gradually increase.
Bone Mass and Fat-Free Body Weight
Bone mass estimates the weight of your skeletal tissue. For most people, this number barely changes over time. It’s not sensitive enough on a consumer scale to detect early bone density loss, so don’t rely on it for that purpose. It’s more of a baseline reference.
Fat-free body weight is simply your total weight minus all your fat. It includes muscle, bones, organs, and water. This is a useful single number for tracking whether your non-fat tissue is being preserved during weight loss.
BMI: What It Does and Doesn’t Tell You
BMI divides your weight by the square of your height. A reading of 18.5 to 24.9 is classified as normal weight, 25 to 29.9 as overweight, and 30 or above as obese. The problem with BMI is that it can’t distinguish between fat and muscle. Someone who is muscular and lean could register as overweight by BMI while having a perfectly healthy body fat percentage. Since your Renpho scale gives you body fat percentage directly, that’s a more useful metric for most purposes. BMI is best used as a rough population-level screening tool, not a personal fitness measure.
How to Get Consistent Readings
BIA scales are sensitive to a surprising number of variables. Hydration levels change the electrical conductivity of your tissues, which directly shifts your body fat, muscle, and water readings. A meal, a glass of water, a cup of coffee, or a workout can all move your numbers noticeably within the same day. Even room temperature and humidity can affect results by changing how electricity travels through your skin.
The best approach is to weigh yourself at the same time every day under the same conditions. Morning works well: after using the bathroom, before eating or drinking, and before exercising. Stand barefoot with your feet flat and evenly placed on the sensor pads. Inconsistent foot placement is one of the most common sources of erratic readings. Avoid weighing in right after a workout or a large meal. The goal isn’t to get one perfect number but to collect data under repeatable conditions so your trends are meaningful.
Using the Renpho App to Track Trends
Individual daily readings will bounce around. That’s normal and expected. The real value of a smart scale comes from watching your trends over weeks and months. In the Renpho Health app, tap the trends button at the bottom of the main screen (it looks like an arrow in a square). From there, you can view graphs for every metric, not just weight. Along the bottom, you can select which measurement to view. Along the top, you can toggle between week, month, three-month, year, or all-time views.
A useful habit is to check your trends monthly rather than scrutinizing daily numbers. Look for the direction of your body fat percentage, skeletal muscle, and visceral fat over a 30- to 90-day window. If body fat is trending down and skeletal muscle is stable or rising, your nutrition and training are working regardless of what the weight line does on any given day. Weight can shift by two to four pounds in a single day from water alone, so zooming out is how you separate real progress from noise.