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  1. #1
    2 Fat 2 Furious contango's Avatar
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    Some surprising figures

    Today I was pushing what I could manage. My wife set off for work while I set off for another town 35 miles away to pick up a couple of bits, and then came back.

    Including the time I spent at the shop (which wasn't a whole lot), I covered 70 miles in 4 hours and 10 minutes. Taking out the time at the shop that probably drops to more like 4 hours, maybe 3:50. But let's run with 4:10 because I don't want to overstate stuff.

    Using bikecalculator.com I entered my details - my weight of 240, I guess the bike weighs about 20, riding the hoods using clinchers, I set the gradient to 0 because although it undulated a little there were no particularly nasty climbs (the total ascent worked out something like 20 feet per mile), and the headwind to 8mph - I had something of a headwind both ways, the forecast said force 3-4, so I assumed a constant value that seemed reasonable.

    According to the results it gave me I was putting out 271 watts for four hours, burning 3886 calories in the process. I find those figures surprising, I usually figure about 40 calories per mile which would land me more like 2800 calories. If I factor out the time I spent in the shop buying my stuff and drop the time to 3:50 then the power goes to 315 watts, and if I drop the headwind to 5mph it shows 257 watts for four hours.

    Do these figures seem reasonable - have I got stronger than I realised?
    "For a list of ways technology has failed to improve quality of life, press three"

  2. #2
    Senior Member
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    I think that the calorie burned figures are always totally inaccurate. If they were, I would've lost more weight by now!
    FACT: You can shave all the hair on your body to save 100 grams

  3. #3
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    Quote Originally Posted by blackvans1234 View Post
    I think that the calorie burned figures are always totally inaccurate. If they were, I would've lost more weight by now!
    +1.

  4. #4
    That guy from the Chi Chitown_Mike's Avatar
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    I always use a 35 calorie per mile figure when calculating out my rides. It keeps me honest IMO and I am not faking myself out. I do add in an extra 35 if my average speed is over 17 mph because I know I was pushing myself then.
    Looking forward to my winter commuting adventure.....

  5. #5
    Senior Member Jarrett2's Avatar
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  6. #6
    Senior Member volosong's Avatar
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    Quote Originally Posted by Jarrett2 View Post
    Wow! Cycling burns about twice as many calories as the other stuff I do, (i.e., tennis, rowing, kayaking).

    They have an iPhone app. I'll have to load that up when I get home today.
    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
    2 Fat 2 Furious contango's Avatar
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    Quote Originally Posted by Jarrett2 View Post
    Those figures are even higher - the best it can offer is "cycling 14-16mph" so I chose that, and given the distance I said I was doing it for 300 minutes. No chance to enter things like wind, gradient etc, and it gave me a total of 5760 calories. I'd love to believe that but 80 calories per mile would have me as thin as a rake by now. Unfortunately the mirror and the scale remind me quite regularly that I'm not as thin as a rake
    "For a list of ways technology has failed to improve quality of life, press three"

  8. #8
    Senior Member Jarrett2's Avatar
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    Do you track your daily intake of calories? It's pretty easy to have them climb into the 3-5000 range if not watching.

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