Difference between Calories and Kilojules

Discussion in 'Health Nutrition and Supplements' started by dq75, Jan 18, 2005.

  1. dq75

    dq75 New Member

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    Can anyone tell me the difference between calories and kilojules? As my bike computer displays how many calories i've burnt and the back of food labels it has the kilojules (energy) content, and i've been confused as to how many kj's I need to take when i'm burning "X" amount of calories per ride??:D
     
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  2. Mouse Potato

    Mouse Potato New Member

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    * Thinks back to high school, which was a looong time ago *

    1 Calorie = 4.18 kilojoules

    The convention is that Calories with a big "C", as in this context, actually means kilocalories (i.e. 1000 calories, which by convention is written with a little "c").
     
  3. ric_stern/RST

    ric_stern/RST New Member

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    yes, 1 Kcal = ~ 4.18 kj.

    however, depending on the OP actual bike computer the energy expenditure could be completely wrong. It will only be (ballpark) accurate if the original poster is using a Power Tap, or SRM. This is because energy expended is equal to average power (/1000) * time (secs). If you're using (e.g.) a HRmonitor it will base EE on some regression equation of avg HR (or something) and this won't be accurate (else we wouldn't need power meters, we could just make do with HRmonitors or bike computers).

    Ric
     
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