Strava Power Data showing different numbers from Garmin 840

[CEwell]

Hi,

Strava continually shows lower power reading when compared to power reading on my Garmin.  I have disconnected Strava from my Garmin several time and it still shows lower power reading.

[Scout · Accepted solution]

Hi @CEwell, 
Thanks for your post and sorry for the differences you're seeing in your activities. These data discrepancies could either be a result of the way your file is formatted or the way your device/app is choosing to analyze the data.
 
Another consideration is whether your device/platform uses a different method than Strava when calculating your stats. While other platforms might exclude null or 0w values in the power data, Strava does not allow you to exclude these values, and they will be included in your overall power analysis. 0w values can be a result of instances where you may not pedal when you coast downhill, for example. Null values occur when there are no power values for certain points - like if your power meter died (but not if it’s paused). Null values will be treated as 0w. One calculation isn't necessarily correct or incorrect, but we do feel we're using standards that most athletes would agree upon.
 
We understand our athletes use hundreds of different devices and apps and are doing our best to accurately analyze each file regardless of the differences in file formatting. We're always working to improve our athletes' experience, and we will pass this feedback along to our engineering teams.