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The best smart scales 2021: track your weight and body composition

Included in this guide:

Eufy smart scale on the floor beside skipping rope
Smart scales send your weight and body composition directly to your smartphone (Image credit: Eufy)

We've tested and ranked the best smart scales you can buy today. Whether you're trying to lose weight, build muscle or just maintain your current body composition, a smart scale will make it easy to track any changes over time and tweak your diet and exercise if necessary.

Smart scales don't just provide more metrics about your body, but connect to your phone too, via either Wi-Fi or Bluetooth. This means you can keep an eye on your weight or body fat percentage from your phone, with many apps allowing you to set goals, chart your progress over time and share your stats with other apps and services.

Many smart scales just focused on weight either, but tell you all kinds of stats, such as your body fat percentage, muscle mass and bone mass. This is a much better way of seeing the big picture of your health, and helping you see changes that aren't reflected in pounds alone.

We've put each of the smart scales below to the test and rated them based on how easy they are to set up and use daily, how consistent and accurate their readings are when compared to a gym body composition scale, how easy it is to sync measurements with the mobile app, and how effectively the app presents the information.

The best smart scales

White Xiaomi Mi Body Composition Scale 2

The Xiaomi Mi Body Composition Scale 2 is smart, sleek, and refreshingly simple to use, delivering a host of vital health stats to your phone in seconds (Image credit: Xiaomi)

Accurate, sleek and simple to use, the best smart scale you can buy

Reasons to buy
+Sturdy and steady+Minimalist design+Works with or without app+Very reasonably priced
Reasons to avoid
-Uses four AAA batteries-Doesn't measure heart rate-No Wi-Fi connectivity

The Xiaomi Mi Body Composition Scale 2 takes our number one place as the best smart scale you can buy today. Not only is it a breeze to set up, it also delivers accurate and consistent body composition data that you can track easily in the Mi Fit smartphone app.

The design is sleek and minimalist, the display (which only appears when the scale is in use) is bright and easy to read while standing up, and the non-slip glass platform feels sturdy and stable underfoot.

In our tests we were particularly impressed by the simplicity of the whole process. If you only want to see your weight then no setup is required at all, but the scale allows up to six people to keep profiles with comprehensive stats including fat and muscle mass, BMI, and even estimated basal metabolic rate.

Your weight and body composition stats will sync with Google Fit, Apple Health and Samsung Health automatically, and if you own a Xiaomi fitness tracker like the Mi Smart Band 6, it's even easier to recommend, as all your health and wellbeing data will be gathered together in one place.

Eufy Smart Scale C1

The Eufy Smart Scale C1 is easy to use, feature-packed, and surprisingly cheap (Image credit: Eufy)

Makes tracking your body composition simplicity itself

Specifications
Body composition: Yes
Bluetooth: Yes
Wi-Fi: No
Maximum users: 16
Reasons to buy
+Fast, easy setup+Affordably priced+Excellent app
Reasons to avoid
-Fairly small platform

The Eufy Smart Scale C1 is refreshingly fast and easy to set up. Just install the app, enter your name, height and gender, and you're ready to step aboard and start weighing. It takes mere seconds, and the scale can track up to 16 users (it will identify each person according to their weight and body stats).

Weight and body composition data was in line with that recorded by professional scales at our gym, and results were consistent across multiple weigh-ins.

There's no Wi-Fi connectivity, which means you'll need to have your phone within Bluetooth range in order to sync your data, but that's not a serious hardship – particularly since the scale can store up to 100 readings between syncs if it's out of range.

This is one of the smallest scales we've tested, with a platform measuring 28 x 28cm. That makes it handy for small bathrooms where storage space is at a premium, but if you sometimes struggle with balance then you might find one of the many Withings Body smart scales a better choice,

Withings Body+

The Withings Body+ smart scale gives you a detailed picture of your overall health, particularly if you also own a Withings smartwatch (Image credit: Withings)

Collects all your health data in one convenient place

Specifications
Body composition: Yes
Bluetooth: Yes
Wi-Fi: Yes
Maximum users: 8
Reasons to buy
+Large non-slip platform+Feature-packed app+Syncs via Bluetooth or Wi-Fi
Reasons to avoid
-Not the cheapest option

The Withings Body+ is another superb smart scale, with all the essential features you need for monitoring your health and weight. Setup isn't quite as effortless as the Eufy Smart Scale C1, but it's still straightforward, and if you have any other Withings devices (like a Withings Scanwatch, for example), all the data from these will be collated with info from your scale in one convenient dashboard.

The app also pulls in data from third-party apps like Apple Health and Google Fit, letting you see stats like your activity levels, and compare them with your changing weight and body composition metrics. If you're interested in getting a detailed overall picture of your health and developing better habits, it's a great choice.

Like Withings' other scales (listed below). the Body+ is well designed has a particularly large, bright display that's easy to read when standing up, and a sizeable toughened glass platform that makes it easy to balance. Measurements are consistent, and comparable with those from professional gym scales.

It's not the cheapest smart scale around, but the integration with other apps, devices and services is exceptional, and makes it easy to recommend.

Read our full Withings Body+ review

Garmin Index S2

If you already own a Garmin watch, the Garmin Index S2 will import your weight and body composition right into the app alongside your workout and fitness stats (Image credit: Garmin)

The best smart scale for Garmin device owners

Specifications
Body composition: Yes
Bluetooth: Yes
Wi-Fi: Yes
Maximum users: 16
Reasons to buy
+Tough, stylish build+High-resolution display+Syncs with Garmin Connect
Reasons to avoid
-Expensive

The Garmin Index S2 is another Wi-Fi enabled body composition smart scale, and delivers accurate, consistent results. Its screen is particularly high resolution, which allows you to see detailed graphs of your weight over time.

Data from the scale syncs with the Garmin Connect app, which you'll already be familiar with if you own one of the company's running watches or fitness trackers, allowing you to see all your health data in one convenient place. Garmin Connect also synchronizes with a bevy of third-party fitness and diet apps, including MyFitnessPal, Nike+ and Noom to name just a few, so you don't have to enter data from your weigh-ins manually.

We'd appreciate a little more context around each of the metrics shown in the app (for example, it would be helpful to know whether your muscle mass is normal for your age and gender, and how close it is to the boundaries) but this is nevertheless a great smart scale if your budget will stretch to it.

Fitbit Aria Air

The Fitbit Aria Air doesn't provide body composition data, but is a breeze to use and syncs data with the Fitbit app (Image credit: Fitbit)

The sensible choice for Fitbit owners

Specifications
Body composition: No
Bluetooth: Yes
Wi-Fi: No
Maximum users: Unlimited
Reasons to buy
+Quick Bluetooth syncing+Supports multiple users+Easy to set up and use
Reasons to avoid
-No body composition data

If you own a Fitbit fitness tracker or smartwatch, the Fitbit Aria Air should be the first smart scale you consider. Step on board, and your weight will automatically sync with the Fitbit app on your phone, saving you the effort of entering your details manually. The scale will also calculate your BMI using the height in your Fitbit profile, which is extra convenient.

The main drawback of this smart scale compared to most of the others in this roundup is that it doesn't provide body composition data, so you won't learn your fat, muscle, water and bone mass. However, if you're not overly interested in that additional data then you may appreciate the convenience instead.

When we tested it, we were impressed by how quick and simple it is to set up (provided you already have the Fitbit app on your phone, it takes just moments) and how quickly results are delivered. This is a Bluetooth-only smart scale, so your phone will need to be nearby for your data to sync, but that's not too much of a hardship.

FitTrack Dara

The FitTrack Dara is one of the most affordable smart scales around, and connects to your phone in a matter of seconds (Image credit: FitTrack)

A compact smart scale that's a great choice for families

Specifications
Body composition: Yes
Bluetooth: Yes
Wi-Fi: No
Maximum users: 8
Reasons to buy
+Straightforward setup+Compact design+Accurate readings
Reasons to avoid
-App needs more detail

If you need a smart scale for travelling, the Bluetooth-only FitTrack Dara is an excellent option. It's super small and lightweight, and unlike some other scales (such as the Salter Curve) it doesn't require time-consuming reconfiguration each time it's moved.

Despite its compact design, it's solidly built and will easily handle the bumps and knocks of everyday use. That's particularly important here, as this is a scale built with families in mind.

Up to eight people can use it to track their weight and body composition (it will recognize each person automatically) and if you're a parent, you can create separate accounts for your children on your phone. Great if you want to keep an eye on their growth without them worrying about their weight.

Our only complaint about this excellent little scale is that its companion app doesn't provide as much information about each metric (body fat, muscle, water, BMI etc) as Withings Health Mate, and doesn't give you as much actionable advice.

However, if you're confident that you have a decent understanding of these stats, and how to adapt your lifestyle, the FitTrack Dara might be the perfect smart scale for you.

Withings Body Cardio

The Withings Body Cardio doesn't just track weight and body composition; it also gives you an idea of the health of your arteries (Image credit: Withings)

A smart scale that helps with more than just losing weight

Specifications
Body composition: Yes
Bluetooth: Yes
Wi-Fi: Yes
Maximum users: 8
Reasons to buy
+Detailed body composition data+In-depth health metrics+Practical lifestyle advice
Reasons to avoid
-Expensive

The Withings Body Cardio is the company's most advanced smart scale. Not only does it give an accurate measurement of your weight, muscle mass, body fat and so on, it can also provide an indication of your overall cardiovascular health, and help you take action to improve it.

The scale can measure both standing heart rate and pulse wave velocity. A lower heart rate is generally a sign of better fitness, while pulse wave velocity indicates how flexible your arteries are. Stiffer arteries mean your heart has to work harder to pump blood around your body.

If that sounds confusing, don't worry – it's all clearly explained when your data is synced with the Withings Health Mate app (via either Bluetooth or Wi-Fi). together with practical advice to help you improve your readings.

This isn't a scale you'll want to be carrying often (it's much heavier than the others in this listing), but its two-layer design with no feet means it can be used on any type of floor. That's a real win if you want to weigh yourself in a carpeted bedroom – electric scales are usually only suitable for hard floors, 

This is a premium scale, and has a price tag to match, but if you're interested in making long-term changes and improving your fitness rather than just losing weight, it could be well worth the investment.

Cat Ellis

Cat Ellis is the fitness and wellbeing editor at TechRadar. She's been a technology journalist for 11 years, and cut her teeth on magazines including PC Plus and PC Format before joining TechRadar. She's a trained run leader, and enjoys nothing more than lacing up her shoes and hitting the pavement. If you have a story about fitness trackers, treadmills, running shoes, e-bikes, or any other fitness tech, drop her a line at catherine.ellis@futurenet.com.