Low calories on ride

[Andybicko]

When going on long bike rides I'm getting a huge difference between the calories burnt on strava and calories burnt on my myzone heart rate strap. Today I rode for 3 hours and strava is saying I burnt 520 calories! Where as my HR strap says 3.5k which is more believable as it was an extremely hard ride. 249 relative effort. My chest strap links to my garmin 520 which shows my HR on there and strava takes that HR on the activity but for some reason not the calories. Any help please? Thanks

[Jan_Mantau · Accepted solution]

You can read about Strava's calorie calculations in this article: https://support.strava.com/hc/en-us/articles/216917097-Calorie-Calculation

Basically you need your correct weight, bike weight and bike type set up for Strava estimating your power output and consequently your calories. Also it couldn't hurt to to check the activity on Garmin Connect what calories are displayed there because usually Strava uses the calories of Garmin without change.