A scale tells you one number: how much you weigh. An InBody scan tells you about a dozen, and most women have no idea what most of them mean.
This is unfortunate, because that scan is one of the most useful tools for tracking real progress. Used properly, it tells you whether you’re losing fat or muscle, whether your training is working, and whether your body is heading in the direction you actually want.
Let me walk you through what each number means in plain language.
What an InBody scan actually does
The InBody machine sends a small, harmless electrical current through your body. Different tissues conduct electricity differently — muscle and water conduct well, fat resists more. By measuring how the current moves through you, the machine calculates how much of you is muscle, how much is fat, and how much is water.
It’s not perfect. No method short of a hospital DEXA scan is. But it’s far more useful than a scale, and consistent enough that tracking your numbers over time gives you real information.
The numbers that actually matter
1. Total weight
The same number your bathroom scale gives you. By itself, it tells you very little.
2. Skeletal muscle mass (SMM)
This is the weight of the muscle tissue in your body. It’s the most important number on the scan for most women.
Why? Because muscle is what creates shape, drives metabolism, and protects you against the natural muscle loss that comes with age. If your skeletal muscle mass is going up over months, you’re getting stronger, more defined, and metabolically healthier — regardless of what the scale says.
Typical healthy ranges for women: 20-30 kg, depending on size and frame. More is generally better.
3. Body fat mass
The weight of the fat tissue in your body. Not bad in itself — fat is essential — but most women want to reduce it, at least to a point.
Tracking this number, rather than just total weight, tells you whether you’re losing fat specifically. A drop in total weight that includes a drop in fat mass = good. A drop in total weight with no drop in fat mass = you’ve lost muscle, which is the wrong direction.
4. Body fat percentage
Body fat mass divided by total weight, expressed as a percentage. This is the number women obsess over, often wrongly.
Reference ranges for women (approximate):
- Athlete: 14-20%
- Fit: 21-24%
- Average: 25-31%
- Above average: 32%+
Note: these ranges are general. Genetics, age, and ethnicity all affect what’s healthy for a given woman. Don’t chase low numbers for their own sake. Women dropping below 18% often see hormonal disruption, missing periods, and reduced bone density. There is a real cost to going too lean.
5. Visceral fat level
This is the fat around your organs, not the fat you can pinch on your arm or stomach. It’s far more important for your health than total body fat.
InBody rates visceral fat on a scale from 1-20:
- 1-9: healthy.
- 10-14: elevated, worth addressing.
- 15+: concerning, real health risk.
Visceral fat responds quickly to consistent training and reasonable nutrition. Even small lifestyle changes can drop the number significantly within a few months.
6. Basal metabolic rate (BMR)
The estimated calories your body burns at complete rest — sleeping, breathing, keeping organs running. The more muscle you have, the higher this number, which is part of why strength training is so valuable for women.
Knowing your BMR helps you eat appropriately. Most women eat in deficit when they’re trying to lose fat, but if you don’t know your starting point, you don’t know how big the deficit is. The InBody gives you a working number.
7. Segmental lean analysis
This breaks down where your muscle is distributed — left arm, right arm, trunk, left leg, right leg. It tells you about imbalances.
Most women have noticeable differences between sides. A meaningful imbalance (10%+ difference between left and right) is worth addressing, often through single-side work in your training.
8. Phase angle
This is one of the more interesting metrics. It measures the integrity of your cell membranes — essentially, how healthy your cells are. Higher phase angle is associated with better health and recovery.
Typical range for women: 4.5-6.5. Above 6 is excellent. Below 4.5 may indicate fatigue, illness, or poor recovery.
How often to scan
Every 4-8 weeks is plenty. Scanning more often than that doesn’t give you useful information — short-term fluctuations in water, food, and timing of day all affect the numbers. The trend matters, not the daily reading.
Tips for accurate scanning:
- Same time of day each scan, ideally morning.
- Empty stomach, after using the bathroom.
- Before training, not after.
- Not on your period (water retention affects the numbers significantly).
- Wear similar clothing each time.
What to actually do with the numbers
After your first scan, you have a starting point. After your second scan (6-8 weeks later), you have direction. Look at three things:
- Did skeletal muscle mass increase or hold steady? You want either.
- Did body fat mass decrease? If yes, you’re losing fat.
- Did visceral fat level decrease? Most important for long-term health.
If muscle is going up and fat is going down, your training and nutrition are working — even if the scale weight is similar or unchanged. This is called body recomposition, and it’s the goal.
What the InBody won’t tell you
- How you sleep.
- How you feel.
- How strong you are in actual workouts.
- Your menstrual health, hormonal status, or stress levels.
The scan is one piece of the picture. Don’t let it become the whole picture. Some of the strongest, healthiest women at Virago barely look at their numbers. Some of the women obsessing over the readings are struggling the most. Use the data. Don’t be used by it.
The summary
An InBody scan tells you what’s actually happening inside your body, beyond the surface-level number on the scale. Used quarterly, it’s one of the best feedback tools you have. Used daily, it’s an anxiety machine.
Scan, learn, train accordingly, scan again in two months. Repeat.
