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Different total distance after exporting to gpx

I recorded a track today using my Garmin Forerunner 920 watch (fit format). Uploaded it to Garmin Connect. It shows total distance 13.85 km (watch shows the same)

But when I export this activity to gpx and upload to either GPS Track Editor or https://gpxstudio.github.io/ it show 14.5 km.

What might be the cause?

0 mcinner1 over 4 years ago

Was it a bicycle activity and did you use a speedsensor?

If so:
the fit file contains two sorts of distance recording:
-one mesured by speedsensor (used by Garmin Connect and device)
-one measured by GPS (used by GPX programs)
If the track was a good recorded track (check by following the track on the map) you should increase the wheelcircumference by factor 1,045.