InBody Body Composition Analyzer

Take the guess work out of what that number on the scale really means!

Our InBody 580 body composition analyzer quickly delivers advanced insights into your body composition.  InBody 580 combines gold-standard accuracy with highly advanced outputs, measuring Segmental Phase Angle and Segmental ICW (intracellular water) as well as muscle and fat changes.

Track fat loss and muscle gain, identify muscles imbalances, monitor visceral fat levels and much more to tailor your fitness and nutrition plans.

What does InBody Body Composition Analyzer measure?

Body Composition Analysis

This section gives you a solid breakdown of your overall body composition, displaying these vital measurements in pounds (lb) or kilograms (kg):

• Total Body Water (divided into Intracellular and Extracellular Water)
• Fat Free Mass
• Dry Lean Mass
• Body Fat Mass
• Weight

Intracellular and Extracellular Water

At the top, you have Intracellular Water (body water inside cells) and Extracellular Water (body water outside cells), which make up Total Body Water.

Why does this matter?

Both ICW and ECW are valuable, but monitoring Extracellular Water, can provide deep insights. If you notice an increase in ECW, but not ICW, this could be due to acute inflammation from overtraining.

Dry Lean Mass

This value is the weight of the protein and mineral content in your body.

Why does this matter?

Because protein makes up most of your muscle, and Dry Lean Mass excludes body water, if your Dry Lean Mass increases, then this is generally a sign that you have gained muscle mass!

Body Fat Mass

Below Dry Lean Mass is Body Fat Mass. This value reveals how much body fat, both surface level (subcutaneous) and internal (visceral), makes up your weight. Displayed in the second column from the right, Fat Free Mass (FFM) is the sum of your ICW, ECW, and Dry Lean Mass. FFM is the weight of everything in your body except fat; for this reason, it is also called Fat-Free Mass. Fat Free Mass includes muscle, water, bones, and organs.

Why does this matter?

Usually, increases in FFM reflect an increase in muscle mass (which you can also see as an increase in Dry Lean Mass) and is considered an improvement in body composition. However, people who do not maintain normal body water ratios may have increased FFM due to swelling caused by strenuous exercise or activity.

ECW/TBW Analysis

ECW/TBW is a measure of compartmental fluid distribution and shows, as a ratio, how much of your total body water is extracellular. Taking multiple InBody Tests will establish your normal fluid status and help determine any imbalances. As a general guide, check to see that your ECW/TBW is below 0.390.

Why does this matter?

This graph lets you quickly understand if you have occasional inflammation or swelling in your body resulting from strenuous exercise or activity. You can also use this to give context to FFM. High FFM and a high ECW/TBW ratio usually indicate excess body water—not just muscle.

Muscle-Fat Analysis

This section shows how your Weight, Skeletal Muscle Mass, and Body Fat Mass compared to the healthy average range of people of the same height and sex. With Muscle-Fat Analysis, you get a better understanding of where your current body composition is so you can make any changes to get it to where you would like it to be.

Muscle-Fat Analysis is a favorite output for many people because it provides an easy-to-understand overview of body composition and helps narrow the focus of health goals.

Muscle-Fat Analysis has three components:

WEIGHT

This is your Total Body Weight.

SKELETAL MUSCLE MASS (SMM)

This is the total weight of your Skeletal Muscle Mass (SMM). SMM is the muscle that can be grown and developed through exercise. Unlike Lean Body Mass, which includes everything except body fat, you can confidently interpret an increase in SMM as muscle gain.

BODY FAT MASS

This is how much body fat you have (both the surface level and internal fat).

The Muscle-Fat Analysis also tells you whether you have a healthy balance of SMM and Body Fat Mass in respect to your weight.

Obesity Analysis

This section displays your body fat percentage, or Percent Body Fat (PBF), and Body Mass Index (BMI), as well as the average ranges for these measurements.

Why you should focus on Body Fat Percentage over BMI

BMI is determined by dividing your weight by your height squared. BMI is just a single value that does not differentiate between fat or muscle mass. If you use BMI to track your fitness progress, you will never know if the changes were to fat or muscle.

BMI may also oversimplify health risks. Two people with the same height and weight would have the same BMI and health risks—even if one of them has a healthy amount of fat and high muscle mass.

On the other hand, PBF puts your weight into context by showing how much of it is fat mass. Tracking changes in your body fat percentage lets you focus on actual fat loss, not just weight loss, which can also come from muscle mass.

Body Composition History

Tracking positive change

The Body Composition History graph makes it easy to spot when positive body composition changes occur. For instance, a gradual increase in Skeletal Muscle Mass and decrease in Body Fat Mass over the past few tests indicates that you’ve made excellent progress towards improving your overall body composition.

Why does this matter?

By any measure, this indicates that you are on the right track to achieve your goals. You should continue to follow your diet and exercise routine and closely monitor your progress using Body Composition History.

Tracking negative change

The Body Composition History graph also makes it easier to spot negative body composition changes. For example, a drop in body weight may initially appear like a positive change, but regular testing may show that this trend was due to muscle loss, not fat loss.

Why does this matter?

A graph like this can be a real eye-opener because it shows that negative body composition changes can occur if your weight remains the same or even decreases for the wrong reason.

Segmental Lean Analysis

Segmental Lean Analysis displays your Fat Free Mass (Lean Body Mass) in all body segments in pounds and its sufficiency to support your body weight as a percentage.

Interpreting your Segmental Lean Analysis can help you:

• Spot areas for improvement
• Assess if your Fat-Free Mass is sufficiently developed in all body segments
• Identify if you have any muscle imbalances

The InBody divides your body into five body segments: your arms, legs, and trunk (torso), or the area between your neck, arms, and legs. The data for each body segment is displayed as two bars.

Top Section

The top value shows how much Fat Free Mass (Lean Body Mass) you have in pounds for each body segment.

Just like with the Muscle-Fat Analysis, the top bar of the Segmental Lean Analysis compares the pounds of Fat-Free Mass against the average expected amount of Fat-Free Mass for your height. You should always work to be at 100% or higher.

Bottom Section

The bottom value compares your FFM against your measured body weight, which helps you determine if you have enough Lean Body Mass to support your body weight, where 100% is sufficient.

Why does this matter?

Segmental Lean Analysis can help you see areas where you need to increase your Lean Body Mass. Achieving a more balanced, healthy body composition may have other positive effects, such as body fat reduction.

Muscle Imbalance

Muscle imbalances are relatively common in today’s increasingly sedentary population. People who have jobs where they sit down for most of the day tend to have a developed upper body but an underdeveloped lower body.

Another imbalance the Segmental Lean Analysis can reveal is the imbalance between your right and left arms and/or legs. This type of muscle imbalance can be due to many reasons, including a workout routine that focuses on one side of the body over the other.

Why does this matter?

If you have an upper and lower muscle imbalance, increase your FFM in your lower legs to reduce your risk of injury. On the other hand, if one side of your body has more developed muscle mass than the other, optimize your strength training to achieve a better-balanced FFM distribution.

Visceral Fat Levels

There are two main types of body fat: subcutaneous and visceral. The Visceral Fat Area graph allows you to determine how much harmful visceral fat you have.

Why does this matter?

Research has found that visceral fat is affected by cardiovascular exercise. Engage in more cardiovascular exercise to lose visceral fat and improve your health.

Bioelectrical Impendance Vector Analysis (BIVA) Graph

The BIVA graph compares the raw resistance (R) and reactance (Xc) values measured in the body on an X-Y graph, determined by body cell mass and body water distribution. Resistance is linked to total body water, while reactance reflects cell membrane integrity and body cell mass.

The BIVA graph distinguishes between dehydration (longer vector, higher resistance) or fluid overload (shorter vector, lower resistance).

A shift in the BIVA graph may suggest poor cellular health or muscle wasting, which is common in elderly and sedentary populations or those with Sarcopenia, cancer (cachexia), or chronic illnesses like COPD. Monitoring this output can help medical professionals track clinical deterioration or improvement.

Why does this matter?

This output can help athletes, fitness enthusiasts, and wellness clients maintain optimal hydration levels. It is also valuable for evaluating the effectiveness of fitness training or changes in cellular health over time.

Segmental Fat Analysis

You can use this section to analyze body fat distribution across each limb for comprehensive obesity assessment and body shape evaluation.

This segmental analysis provides detailed insights into regional adiposity patterns, helping you track changes in body fat distribution over time and identify areas that may require targeted attention in your health and fitness approach. You can use this section to track your body composition improvements and changes in body fat over time.

While studies have shown that you can’t spot target body fat with exercise, you can use this section to get a more detailed account of your progress and stay motivated.

Body Fat-Lean Body Mass Control

This section makes it very easy for you to set health and fitness goals and help you achieve the recommended body fat percentage for your sex (15% for men, 23% for women).

Depending on your current Muscle-Fat balance, this Result Sheet output will recommend adjusting Body Fat Mass and/or FFM to reach the target PBF. If you have too much Body Fat Mass, the InBody will advise losing a certain amount of fat mass and maintaining or increasing FFM. The InBody will never recommend losing FFM.

Why does this matter?

These recommendations are general guidelines for helping you achieve optimal health. However, you may have your own set of goals, so discuss them with your physician, personal trainer, or nutritionist before planning a routine for meeting those goals.

Basal Metabolic Rate

Your Basal Metabolic Rate, or BMR, is the total number of calories you need for your basic essential functions. This value allows you to work with your dietician to create a nutritional plan, which is key to reaching your body composition goals.

You may think that your BMR is the number of calories you should eat in a day, but this is NOT the case. BMR does not take into account any calories needed to perform daily activities, and so your actual caloric need for the day is likely much higher than your BMR.

Why does this matter?

You can use this section to track your body fat changes over time. While studies have shown that you can’t “spot target” body fat with exercise, you can use this section to get a more detailed account of your progress and stay motivated.

FFMI

Fat-Free Mass Index (FFMI) is a measurement of an individual’s Fat-Free Mass relative to their height. It is calculated by dividing their Fat-Free Mass by their height squared (m²).

Why does this matter?

FFMI allows for better individual tracking of Fat-Free Mass over time, particularly for people with muscle wasting from chronic illness (e.g., cancer and sarcopenia), elite athletes, or aging populations.

FFMI also helps people stay on track to achieve fitness goals by differentiating between lean mass improvements and just overall weight gain.

SMM/WT

SMM/WT is a ratio indicating what percentage of the individual’s body weight is Skeletal Muscle Mass. It is akin to Percent Body Fat but for muscle instead of fat. SMM/WT shows the proportion of body weight made up of muscle. A higher SMM/Weight usually reflects better fitness and a more ideal body composition. Fitness professionals use SMM/WT to help tailor exercise programs and monitor improvements in muscle gain. SMM/Weight also helps health professionals determine if weight loss is healthy (fat loss) or problematic (muscle loss). In chronic illness, cancer, or eating disorders, a declining SMM/Weight ratio can show loss of Fat-Free Mass even if weight remains stable.

Why does this matter?

Low muscle mass can predict poor surgical outcomes, delayed healing, or complications. Caregivers can leverage SMM/WT to help identify patients who may benefit from prehabilitation or advanced rehab programming.

TBW/FFM

TBW (Total Body Water) and FFM (Fat-Free Mass) are two key body composition metrics measured by InBody. TBW: The total amount of fluid in your body. It includes water inside your cells (Intracellular Water) and outside your cells (Extracellular Water).FFM: The weight of everything in your body except fat. It represents your muscle mass, bone, organs, and TBW.

The ratio between your total body water and your fat-free mass represents your FFM Hydration.

Normal Range: In healthy adults, this ratio naturally stays very stable at roughly 73%

Why does this matter?

If this ratio goes up, it often signals fluid retention or swelling (edema). If the ratio drops, it generally indicates dehydration.

Whole Body Phase Angle

Phase angle represents the integrity, or strength, of cell membranes and can be a more sensitive indicator of health status when physiological changes are not apparent.

Phase angle value fall between 4 and 6 degrees for women and 5 and 7 degrees for men, with a higher phase angle indicating higher cellular integrity.

In athletic individuals or those with naturally high muscle mass, these values may be higher than the average range, indicating above-average cellular health. Phase angles that fall below the range are not necessarily indicative of poor health but should be monitored to ensure that they do not decrease progressively.

Why does this matter?

Tracking phase angle over time can help identify potential changes to cellular health that may be associated with disease.

Benefits of Using InBody Composition Analysis:

Insights beyond weight: Unlike standard scales, the InBody composition scale differentiates weight from fat, muscle and water.

Accuracy: InBody calculates body fat percentage and visceral fat) for a more accurate health measurement than BMI.

Targeted fitness and nutrition plans: InBody provides detailed reports that enable you to create the most effective nutrition and fitness programs for your health.

Hydration monitoring: InBody determines hydration levels which can impact metabolism and overall health.

Segmental lean analysis: InBody measures muscles mass in different regions of the body, enabling you to identify imbalances in training.