Best smart scale for 2021: Withings, Fitbit, Garmin and Eufy, compared

Today's bathroom scales do a lot more than just weight measurement. Many have sensors that can estimate body metrics like your muscle mass and body fat, calculate your body mass index, measure your heart rate and even calculate your basal metabolic rate, all in an effort to keep track of your health, meet a fitness goal or help you lose weight.

Smart bathroom scales use Bluetooth or Wi-Fi to sync all of the body composition metrics they record about you to an app on your phone. Typically that's the app from the company that makes the scale, but in most cases, you can also sync that data to popular fitness apps like Google Fit or Apple Health, which can help you contextualize your body composition measurements but incorporating that data into existing information the apps have about your workout and dietary habits.

Like we said, a Bluetooth smart scale does so much more than the bathroom scales of the past. To make it easier for you to pick the best smart scale, let's go through the pros and cons of the top smart models on the market by Withings, Fitbit, Garmin and others. Read more: Peloton, Daily Burn and more: Best workout subscription apps