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  1. #1
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    Why the difference?

    Uploading directly from Garmin 510 to Strava and to MapMyRide, why is their difference in everything from Calories to Distance rode. As an example my ride this morning, Strava shows distance 17.5 and Calories 774 while MapMyRide shows distance 17.47 and calories burned 1000. More curiosity than anything, but why the difference?

  2. #2
    Senior Member SeanBlader's Avatar
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    Strava probably rounds to the nearest tenth of a mile.

    And calorie calculations are just notoriously variable. Like a kind of voodoo series of estimates based on hundreds of unknown variables.

  3. #3
    Senior Member IBOHUNT's Avatar
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    Did you upload to Garmin Connect, or Golden Cheetah (freeware) and see what it says? I'm sure it would also be different.
    The distance bit could just be rounding errors used by the programs.
    Calories used on the other hand is a crap shoot at best. There are a tonne of threads, not only here on BF, but others such as Garmin, that refute the calories reported.

    On a recent ride I had done Garmin Connect reports 2,784 calories; Strava reports 4,806. Small difference there eh? </sarcasam>

    I have a power meter and the 'work' reported by Garmin is 4,290kJ, Strava reports 4,310kJ and Golden Cheetah reports 4,301kJ.

    I'm buying into the kJ bit but not the calorie bit.

  4. #4
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    Its not just you, Mapmyride changed their calorie formula last July and its been useless for me ever since. Strava is at least "in the ballpark" for me, I only keep updating to mapmyride because I am too lazy to download all the gpx files and manually upload to strava for the last few years before starting using strava.

  5. #5
    Senior Member SeanBlader's Avatar
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    Basically the variables needed in counting calories burned are so ridiculously variable there are really only best guesses. Factors are:

    your weight
    how much of your weight is in your legs
    bikes weight
    aero drag
    wind conditions
    wheel drag
    gearing
    mechanical efficiency loss

    I'm sure there's more I can't even fathom at the moment, including some multiplier regarding how effective your body is at converting fat/sugar/oxygen into movement. In the end, the developers who come up with calorie algorithms try their best to put in "average" numbers for all those variables, considering there's no one who's really average on all those counts, the numbers that come up are not really applicable for anyone.

  6. #6
    Senior Member volosong's Avatar
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    Quote Originally Posted by iTrek View Post
    ...Strava shows distance 17.5 and Calories 774 while MapMyRide shows distance 17.47 and calories burned 1000...
    I like the MapMyRide numbers. It shows that I'm working harder and losing weight faster.
    Deut 6:5

    ---

    "Ha ha! You fool! You fell victim to one of the classic blunders - The most famous of which is 'never get involved in a land war in Asia'".
    - Vizzini during his "battle of wits" with the Man in Black

  7. #7
    got the climbing bug jsigone's Avatar
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    those are your virtual calories not real calories

  8. #8
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    Quote Originally Posted by volosong View Post
    I like the MapMyRide numbers. It shows that I'm working harder and losing weight faster.
    Yeah, me too. LOL

    Well, I had seen a few of the threads on Calories so realized it would not be the same but I found it interesting that none of the numbers were the same between the two sites. At this point Strava seems to consistently show less calories burned so I think I will use that for calculating calories.

    Thanks for all the replies.

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