Charge 3 distance information inaccurate

[JT68]

I walk on treadmill 5 days a week 60 min & has been 3 miles with last 2 Fitbit.  My Charge 3 is showing only 2 miles.  I have walked 6 today, 14,000 + steps & it shows just 3.5 + miles

Moderator edit: subject for clarity

[AlejandraFitbit]

Welcome to the Community, @JT68.

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 if you need anything else. 🙂