Your Fitbit is small, which means it's easy to lose.
Most of the time, it's probably still sitting in its charger, or on the bathroom sink where you took it off to take a shower. But if you've looked in all the usual locations and still can't find it, here are the best ways to track your Fitbit down.
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Check your Fitbit app or dashboard for clues
Open the Fitbit app on your phone or check the website and see when your Fitbit last synced.
In the app, tap your avatar in the upper left corner and then tap the Fitbit in the device list. You should see when it last synced at the top of the screen. Try to determine where your phone was at the time of the last sync, and concentrate your search there.
Use your phone to sniff out the Fitbit
Take the phone that you've paired with your Fitbit and bring it to where you might have last seen the Fitbit, or think it might be lost.
Try to sync the phone with the Fitbit (pull down the app screen to start a manual sync). If it syncs, your Fitbit is within about 30 feet of that location.
Use a Bluetooth-tracking app
Apps like Find My Fitbit (available for both iPhone and Android), Fitbit Finder (iOS only), and Bluetooth Finder (Android) are apps that use the Bluetooth signal from your Fitbit to help you locate it. (There are others in the Apple App Store and Google Play Store.) None of these apps are affiliated with or certified by Fitbit, however.
With an approximate 100-foot range, you can use your phone to zero in on a misplaced band for as long as the Fitbit still has battery power. You don't need to "pair" the band with the app in advance, so you can download and try one of these apps even after losing your Fitbit.