Charge 3 distance information inaccurate

[eborek]

I rode today about 27.5 miles. I used my Fitbit and it counted only 21.5 miles. I know for a fact the miles should be about 27-28 miles. I wanted to get the exact mileage. I wore the device somewhat loose. Could that be the issue? I'm new to Fitbit

Moderator Edit: Clarified subject

[AlejandraFitbit]

Welcome to the Community, @eborek.

Fitbit devices calculate distance based on the device’s accelerometer data and stride length setting.

Default stride length is based on your height and gender. If available, Fitbit devices use GPS data to calculate more precise distances.When you sync your device, our algorithm interprets the data from the device, and you see your distance traveled in the Fitbit app. 

Note that when you track an exercise with GPS, both GPS and accelerometer data are used to calculate the distance shown in the Fitbit app. For more information about accuracy, check the article: How accurate are Fitbit devices?.

Let me know the outcome.