Find Out How Accurate Your Trendy Fitness Monitor Is

What fitness tracker do you use?

TIME

Activity monitors used to be tools that only scientists used during research, but the fitness-tracking industry, which is projected by analysts to be a $19 billion business by 2018. But how accurate are they really?

In a new study from Iowa State University published in the journal Medicine & Science In Sports and Exercise, researchers assessed how well they actually work. To test the products, 30 men and 30 women wore eight popular monitors during a 69-minute workout that included exercises like Wii tennis, running, and playing basketball. They also wore a medical-grade metabolic analyzer for comparison. The researchers found that some devices were pretty accurate, with estimates within 10 to 15% of precise calorie burn.

Here’s their list, ranked from most to least accurate:

1. BodyMedia FIT performed best with a 9.3% error rating. The researchers say this device has a similar accuracy to devices used in…

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