WT
Weight (WT)
Weight is the only quantity InBody actually weighs; every other component of body composition is derived from it and from impedance.
Short answer
Weight is the one number the device genuinely weighs, and at the same time the least informative on its own. Use it as a starting point and look for the answer in the four components it splits into.
- Body water40.2 kg60.0 %
- Protein10.8 kg16.1 %
- Minerals3.7 kg5.5 %
- Fat12.3 kg18.4 %
What the value represents
Weight is captured by the built-in scale the moment you stand on the platform. It includes absolutely everything: muscle, fat, water and bone, but also the contents of your stomach, intestines and bladder, and whatever you are wearing.
In the InBody model weight splits into four components that add back up to the same number: weight = total body water + protein + minerals + body fat mass. When weight changes, at least one of those four necessarily changed — and that is exactly the information a bathroom scale cannot give you.
Weight is also the reference point for most of the other values on the result sheet. The bar lengths in the Muscle-Fat Analysis and in the Segmental Lean Analysis are drawn relative to the ideal weight derived from your height, not to what you weigh today.
- Total body weight in kilograms, measured by the built-in scale of the device.
- The sum of the four components of the molecular model: water, protein, minerals and fat.
- It does not represent the composition of that weight. Two people of identical weight can have completely different proportions of muscle, fat and water.
How the value is produced
- A directly measured value. It is the only quantity on the result sheet that the device weighs rather than calculates or estimates.
- The weighing range of the device is 5 to 300 kg according to the manufacturer catalogue.
- The other values on the sheet build on weight. Fat mass, for instance, is calculated as the difference between weight and estimated fat free mass, so an error on the scale propagates there too.
- The reference range printed in brackets is derived from ideal weight, which the manual defines as ideal BMI × height², with an ideal BMI of 22 for men and 21 for women in the Asian reference, and 22 for men and 21.5 for women in the Western one.
How to read the current value
- Weight alone does not answer whether your body composition is balanced. Always read fat mass and skeletal muscle mass alongside it — only the three bars of the Muscle-Fat Analysis together make sense.
- The reference range for weight is derived from height, not from your particular body composition. The manual describes ideal weight as a recommended value derived from height, not as a personal goal.
- Target Weight on the result sheet is something different. The manual explicitly states that it is not derived from height and ideal weight, but from balanced body composition.
- A difference from your scale at home is ordinary. Scales differ in calibration, and you weigh yourself at another time of day, in other clothes and with different stomach contents.
How to read change over time
- Swings of a few hundred grams up to a kilogram between days are ordinary and mostly reflect digestive contents and retained water, not fat or muscle.
- If weight has fallen, look at which of the four components fell. A loss made mostly of water looks identical on the scale to a loss of fat, but means something quite different.
- Stable weight does not mean nothing is happening. Muscle mass rising while fat mass falls may not show on the scale at all.
- The manual recommends measuring under the same conditions, ideally in the morning. If the first measurement was in the morning on an empty stomach, the next should be the same — otherwise you are comparing conditions as well as bodies.
General principles: how to read change between measurements →
What to read it with
- Body Fat Mass and Skeletal Muscle Mass – split a change in weight into the part you actually care about.
- Total Body Water – explains fast jumps that cannot possibly be fat or muscle.
- Percent Body Fat – shows how weight divides between fat and everything else.
- BMI – relates weight to height, but cannot say what it is made of.
- Target Weight and Weight, Fat and Muscle Control – the recommendations built from weight and composition.
Common misunderstandings
- Weight is not an indicator of body composition. On its own it cannot tell a kilogram of muscle from a kilogram of fat.
- Ideal weight on the result sheet is not a personal goal. It is a population reference derived from height and a reference BMI.
- Weight gain after starting strength training does not automatically mean fat gain. Check muscle mass and fat mass separately.
- Weight measured by the device is not more accurate than any other calibrated scale. Its value lies in the device calculating body composition from it at the same time.
What can affect the result short term
- Stomach and intestinal contents. The manual therefore recommends measuring fasted — stomach contents count towards weight and towards body composition.
- A full bladder. The manual recommends using the toilet beforehand; water in the bladder is not captured by the composition measurement and inflates fat mass.
- Clothing and objects on the body. The manual recommends removing jewellery, watches, belts, wallets and jackets.
- Time of day and fluid intake. Both weight and the distribution of water shift over the course of the day.
- The menstrual cycle, during which body water fluctuates.
What to do next
The explanation of the value is the same for everyone. Only the suggested step changes — pick whichever fits you.
- Fix one routine: same time of day, fasted, after using the toilet, in similar clothing. Without it you are comparing conditions rather than bodies.
- When weight changes, always open fat mass and muscle mass from the same measurement. That is where the answer to what changed actually lives.
- Do not follow individual days. The trend across several measurements weeks apart is what carries meaning.
- If you are losing weight, use the number as a companion to body composition rather than the headline measure — the goal is usually the ratio of fat to muscle, not the weight itself.
What the value does not determine
- It says nothing about what the weight is made of.
- It does not distinguish changes in fat, muscle and water.
- It includes digestive and bladder contents, which are not part of body composition in the narrower sense.
- The reference range is derived from height, not from individual health context.
On terminology
- The manual distinguishes ideal weight (derived from height and a reference BMI) from target weight (derived from balanced body composition). They are not synonyms.
- The manufacturer speaks of a recommended or reference range, not of a normal weight.
In more depth, with sourcesIn more depth: why weight holds the whole composition model togetherExpand the detailed explanation
InBody uses a molecular four-component model in which weight = total body water + protein + minerals + body fat mass. Bioimpedance does not directly measure any of these as a mass; it measures the resistance and reactance of tissues and derives the volume of body water from them. Protein and minerals are calculated, fat free mass appears as their sum with water, and fat mass appears as the difference between the weighed value and fat free mass.
That makes weight the single absolute anchor of the whole sheet. If someone is weighed in heavy clothing or with a full stomach, the surplus does not simply attach to weight — it attaches to fat mass, because fat is the residual quantity in the model. The manual therefore insists on measuring fasted and after using the toilet, not for the sake of the number on the scale, but for the sake of everything calculated from it.
The manufacturer catalogue also states that age, ethnicity and sex do not enter the body composition calculation at all; they are used solely for reference ranges and scores. That differs from many consumer bioimpedance scales, which often estimate part of the result from demographic data. The NIH consensus statement on bioimpedance independently emphasises that comparability of repeated measurements stands or falls with standardised conditions — which for weight is literally true, since it is an input to every other calculation.
Sources
- InBody 970 Result Sheet Interpretation (ENG_A_211104) — InBody Co., Ltd.
- Bioelectrical impedance analysis in body composition measurement: NIH Technology Assessment Conference Statement — National Institutes of Health
On this page
Related values
Related articles
Where to find it
The first table at the top of the result sheet, labelled Body Composition Analysis.
- Reviewed by
- MojeInBody content team
- Date
An InBody measurement is not a diagnostic tool. Results do not determine health status and do not replace a medical examination.
FAQ
Frequently asked questions
Answers to what people ask most often about this value.
Why is my weight different on InBody than on my scale at home?
The difference comes from a different calibration, a different time of day, different clothing and different stomach and bladder contents. For tracking a trend what matters is measuring on the same device under the same conditions, not making two different scales agree.
I gained a kilo in a day. Can that be fat?
Practically speaking, no. Daily swings come mostly from digestive contents and retained water. A genuine change of a kilogram in fat mass takes weeks, not a single day.
Should I be weighed clothed or unclothed?
The manual recommends removing heavy items — jewellery, watches, belts, wallets and jackets. More important than any particular outfit is wearing something similar at every measurement, because the difference propagates into the calculated fat mass.
Why is my weight rising even though I train and eat less?
Look at which component rose. The gain may be made of muscle mass or retained water rather than fat. Splitting weight into water, protein, minerals and fat is exactly what answers this question.
Explanations make the most sense alongside your own trend.
The public guide is open to everyone. The client portal adds your own value, history and the context of a specific measurement.