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Which? Best Buy fitness trackers

by Katie Waller
Best Buy fitness trackers are accurate, easy to use and comfortable. See which wearables get our seal of approval.

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

Looking to buy a fitness tracker? Nobody goes to the same lengths we do to uncover the most accurate, best activity trackers.

You can be sure that a Best Buy-recommended fitness tracker will be accurate, comfortable and a breeze to use. As opposed to our Don't Buys where experts reveal the worst fitness and activity trackers on sale.

What makes a Best Buy fitness tracker?

Our lab testing has uncovered devices that are inaccurate, and ones where the manufacturer claims it has features that it doesn't. For instance, many fitness watches are falsely said to have built-in altimeters to measure the altitude but, in fact, the watch calculates your ascent and descent using data from GPS and maps, rather than a traditional altimeter instrument.

We’ve discovered fitness and activity trackers that will clock up steps even when you're just moving your arms. So, while you may think you're hitting your step targets and improving your fitness, you're not. We've also found trackers that overstate how many calories you've burned, which could inadvertently lead to you overeating.

  • We've reviewed fitness trackers for every budget – our cheapest Best Buy activity tracker can be picked up for under £50.
  • Our reviews cover models from all the main activity tracker brands, including  Fitbit, Garmin, Jawbone, Misfit, Polar and TomTom,
  • We focus on what’s important: our testers assess every watch and tracker for accuracy, comfort, ease of use and the features on offer.
  • Our experts cut through the jargon and hype of new technology to unearth the genuinely useful features of every fitness and activity tracker. They’ll put sensors and apps to the test to make sure every feature works as advertised.

It took 2,400 minutes on a treadmill to record our Best Buys. Join Which? to access all our in-depth fitness tracker reviews.. Already a member? Log in to find your new activity tracker.

How we test the best fitness and activity trackers

We put the top fitness and activity trackers through a series of tough lab tests and have found some great Best Buy models. But we’ve also found some that are inaccurate and simply not up to the task. We were surprised to see one watch understate heart rate by 23% during our cycling tests. Our goal is to help you pick a fitness watch or activity tracker that's accurate, as well as comfortable and a breeze to use.

33%The amount one tracker over counted steps by during a routine scenario
  • Accuracy: our testers run, walk and undertake everyday tasks while we measure how the device tracks steps, distance, calories and heart rate. Test participants walk on a calibrated treadmill at 4.8km/h for 10 minutes and run at 9-10km/h for 10 minutes so we can check how well the watch tracks steps taken and distance. You can be sure your Best Buy won’t miss a single step or heartbeat.
  • Advanced sports tracking: we take to the pool and go for a 5km outdoor run to test the accuracy of the swim tracking metrics, such as distance, and the GPS tracking.
  • Calorie counting: our testers don a face mask linked to a gas-analysis system to log calorie burn as accurately as possible while walking and running. We then compare this with the watch or tracker count.
  • Ease of use: our testers spend weeks getting stuck into using the watch or tracker and the accompanying app, so you can be sure they’ll find any niggles when using it.
  • Comfort: a fitness and activity tracker could be super-accurate, but if it rubs your skin, digs into your arm or is just plain heavy and ugly, you’re not going to wear it. We get a range of users to assess each device for comfort.

Fitness and activity tracker reviews you can trust

Models from the biggest fitness and activity tracker brands on the market are tested in the Which? test lab – including Fitbit, Garmin, Polar, TomTom and Samsung. Even the most well-known names occasionally drop the ball.

Which? is independent – we work for you, the consumer, so you can be sure that our product recommendations are influenced only by our test results. We don’t take advertising and we buy all the products that we test ourselves, so our advice helps you to make the right choice first time and avoid costly mistakes.

Join Which? and you'll receive access to all our online content and get Which? magazine delivered monthly to your door. You can also phone our Which? Legal Service and personal finance experts for one-to-one help.