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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 06-06-13, 02:14 PM   #1
iTrek
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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?
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Old 06-06-13, 02:38 PM   #2
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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.
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Old 06-06-13, 02:44 PM   #3
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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.
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Old 06-06-13, 02:46 PM   #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.
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Old 06-06-13, 03:27 PM   #5
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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.
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Old 06-06-13, 03:44 PM   #6
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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.
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Old 06-06-13, 03:54 PM   #7
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those are your virtual calories not real calories
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Old 06-06-13, 03:56 PM   #8
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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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