If you train seriously in Budapest, you've almost certainly stepped on an InBody machine. Most Life1 clubs have one. So do half the boutique studios in the 13th district. You hold the handles, the screen beeps for thirty seconds, and out comes a printout with your body fat percentage, lean mass, and a color-coded chart of where you stand.
It feels scientific. And it's useful, to a point.
But if you've ever done two InBody scans in the same week and gotten wildly different numbers, or seen your body fat drop three percentage points between a morning scan and an afternoon one, you've already sensed what we're about to cover. InBody and DEXA are not the same tool. They don't measure the same things. And for anyone serious about tracking body composition over time, the difference matters.
Quick primer: what DEXA actually does
DEXA stands for Dual-Energy X-ray Absorptiometry. It's a low-dose scan that takes about fifteen minutes and produces three precise measurements: how much fat you have, how much lean mass (muscle), and how much bone. It breaks those numbers down by body region, so you can see what's happening in your left leg versus your right, your trunk versus your limbs, and your visceral fat (the deep belly fat that wraps around your organs) as a distinct number.
DEXA is the reference standard in body composition research. When scientists study a new training protocol or a weight-loss drug, this is what they use to measure results. Not because it's trendy. Because the measurement error is tiny, somewhere around one to two percent, and it doesn't drift based on how hydrated you are that morning.
Quick primer: what InBody actually does
InBody uses bioelectrical impedance analysis, often shortened to BIA. The machine sends a tiny electrical current through your body and measures how fast it travels. Fat resists the current. Lean tissue (which is mostly water) conducts it easily. The software takes the resistance reading and uses an equation to estimate your body composition.
The technology is genuinely clever, and the machines have gotten much better over the last decade. The problem isn't the hardware. It's that the equation depends heavily on assumptions that change hour by hour.
Head to head: what actually differs
Accuracy. DEXA measurement error sits around 1 to 2 percent. BIA error typically runs 3 to 8 percent depending on the machine, and it's highly operator-dependent. For context: a 3 percent swing on body fat can mean the difference between "you lost two kilos of fat" and "you lost nothing."
Consistency. This is the big one. InBody is extremely sensitive to hydration status, meal timing, recent exercise, even how sweaty your hands are when you grip the handles. DEXA is not. If you scan in the morning hydrated and again that afternoon dehydrated, InBody will show you a very different body composition. DEXA will show you the same body, because your actual body didn't change.
Visceral fat. DEXA measures it directly by region. InBody estimates it from total numbers. If visceral fat tracking matters to you (and for anyone over 35, it should), this is a meaningful gap.
Regional breakdown. DEXA tells you your left arm has 2.1 kg of muscle and your right has 2.3 kg. InBody can split by limb but the precision is much lower, because BIA has to use statistical modeling to get there while DEXA actually images the tissue.
Bone density. DEXA measures it. InBody doesn't at all. For women especially, and for anyone tracking long-term health, this is a bonus that comes along for free.
When InBody is fine
InBody isn't useless. If you're doing a quick directional check every few months, standing on one at your gym is free and takes 30 seconds. If your number is trending in the direction you want and you just need a rough signal, that's a legitimate use case.
The issue is when people try to use InBody as a precision tool. Tracking a 500-gram muscle gain over six weeks of training? Comparing scans taken after different breakfasts? Using it to adjust your nutrition by 200 calories a day? That's asking more of the tool than it can deliver.
When DEXA is worth it
A few situations where the accuracy gap matters most.
You're doing body recomp. Gaining muscle while losing fat is slow. The changes in any given month are small, often one or two kilos in either direction. If your measurement error is 5 percent, you literally can't see those changes clearly. DEXA can.
You're on a GLP-1. Semaglutide and tirzepatide are spreading fast in Budapest. The weight comes off, but so does muscle and bone density if you're not careful. Tracking that trade-off requires a tool that can actually distinguish fat loss from lean loss. InBody can't reliably do it. DEXA can.
You're an athlete chasing small margins. CrossFit athletes, runners training for a marathon, lifters in a cut. The differences between a good training block and a great one are small, and if your measurement tool can't see below 3 percent error, you're flying blind.
You want a real baseline. A single DEXA scan tells you more about your body than years of stepping on scales. Body fat percentage, muscle distribution, bone density, visceral fat. It's the kind of data that changes how you think about your training.
What it costs in Budapest
The InBody scan at your gym is usually free or bundled into your membership. DEXA has historically been harder to access: fixed locations, inconvenient booking, and prices between 19,000 and 30,000 Ft depending on where you go.
DexaVita is launching in September 2026 with scans starting at 13,400 Ft, delivered at the gyms Budapest athletes already train at. First scans are in the 15-minute range. Same-day results. Book online the way you would a training session.
The short answer
Use InBody for a rough monthly directional check. Use DEXA when you actually want to know what's happening. They're complementary, not competitors, but if you've been relying on InBody alone to track real change over time, you've been using the wrong tool for the job.
Join the waitlist to be first in line when we open scheduling, or see sample results to get a feel for what a real DEXA report looks like.