Best Smart Scales for Body Composition (and How to Read Them)
The best smart scales for body composition: Apple Health, Google Fit and Garmin picks, what BIA can and cannot measure, and how to get steady readings.
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A regular bathroom scale tells you one number. A smart scale tells you ten, sends them to your phone and draws a nice graph. That’s useful, as long as you understand what those numbers are, and as long as the scale talks to the app you already use.
This guide covers the best smart scales for body composition, grouped by app and need. We’ll also be upfront about the limits: body fat percentage from a home scale is an estimate, and the trend matters far more than any single reading.
Quick picks
- Best overall: Withings Body Smart, Wi-Fi sync and good app support.
- Best budget: RENPHO Elis 1, lots of metrics for little money.
- Best feature-packed budget: eufy Smart Scale P2 Pro.
- Best simple budget: Etekcity smart scale.
- Best for Garmin users: Garmin Index S2.
How we chose
We compared each scale’s published metrics, app connections (Apple Health, Google Health Connect, Fitbit, Garmin), weight capacity, Wi-Fi vs Bluetooth sync and multi-user support, and looked at owner feedback about app reliability. We did not lab-test accuracy. No home scale is a medical device.
What a smart scale actually measures
Every smart scale measures your weight accurately enough for home use. The extra numbers come from bioelectrical impedance analysis (BIA): a tiny, safe electrical signal passes through your feet, and the scale estimates body fat, muscle and water from how easily it travels, combined with your height, age and sex. That estimate can be off by several percentage points compared with lab methods, and it moves with hydration, so the useful part is the trend over weeks. We explain this in more depth in how accurate are smart scales.
What to look for
- App support: the most important factor. Pick a scale that syncs with the app you already use.
- Wi-Fi vs Bluetooth: Wi-Fi scales sync on their own. Bluetooth scales need your phone nearby and often the app open.
- Multiple users: most scales recognize several people by weight, handy for couples and families.
- Weight capacity: many go to about 396 lb (180 kg). Check if you need more.
- Display: a large, bright display helps if you don’t want to check your phone each time.
- Pregnancy and pacemaker modes: people with implanted electronic devices like pacemakers should not use BIA. Many scales have a weight-only mode; check the manual.
The best smart scales
1. Withings Body Smart: best overall
Withings has been making connected scales longer than almost anyone, and the Body Smart is a polished all-rounder. It connects over Wi-Fi and Bluetooth, recognizes multiple users and shares data with Apple Health, Google Fit and a long list of other apps. “Eyes Closed” mode hides your weight on the display if you’d rather not see the number every morning.
Good to know: some advanced features in the Withings app sit behind an optional subscription.
2. RENPHO Elis 1: best budget
RENPHO’s Elis 1 is one of the best-selling smart scales on Amazon, and it’s easy to see why: lots of metrics, a 396 lb limit and sync with Apple Health, Fitbit and Google Fit. It uses Bluetooth, so you open the app to sync. Read our full RENPHO Elis 1 review.
3. eufy Smart Scale P2 Pro: best feature-packed budget pick
The P2 Pro adds Wi-Fi sync, a heart rate reading and a 3D body model in the app. It’s a lot of scale for the money and syncs with Apple Health, Google Fit and Fitbit.
Good to know: the extra metrics are still estimates, so don’t overthink them.
4. Etekcity smart scale: best simple budget scale
Etekcity’s smart scales are basic, affordable and reliable, using the VeSync app with Apple Health and Google Fit support. A good choice if you mainly want weight and body fat trends without fuss.
5. Garmin Index S2: best for Garmin users
If you already wear a Garmin, the Index S2 sends weight and body composition straight to Garmin Connect over Wi-Fi, where it shows up next to your training data. It has a color display and supports multiple users.
Good to know: it’s priced higher than budget scales and makes the most sense inside the Garmin ecosystem.
How to get steadier readings
- Weigh yourself at the same time each day, ideally in the morning after using the bathroom and before eating or drinking.
- Stand on a hard, flat floor, not carpet.
- Use bare, dry feet.
- Don’t weigh right after exercise, a sauna or a big meal.
- Look at the weekly average, not today’s number.
Pair your scale with a tape measure and a monthly progress photo for a fuller picture. Our guide on how to track workout progress has a simple system.
FAQ
Are smart scales accurate?
Weight is accurate. Body fat and muscle are estimates that can be off by several percent, but they’re consistent enough to show trends if you weigh under the same conditions.
Which smart scale works with Apple Health?
Withings, RENPHO, eufy and Etekcity all sync with Apple Health. Check the listing to see which metrics sync; some only send weight.
Can I use a smart scale with a pacemaker?
No, not the body composition feature. People with pacemakers or other implanted electronic devices should not use BIA. Use a weight-only mode if the scale has one and ask your doctor.
Wi-Fi or Bluetooth smart scale?
Wi-Fi is more convenient because it syncs without your phone. Bluetooth is cheaper and works fine if you don’t mind opening the app.
Bottom line
Choose the Withings Body Smart for the best overall experience, the RENPHO Elis 1 for budget value, and the Garmin Index S2 if you live in Garmin Connect. Whatever you buy, focus on the trend line, not the daily number.
This article is for general information and is not medical advice.
This guide is for general information only and is not medical advice. Talk to a qualified professional before starting a new exercise program, especially if you have an injury or health condition.