Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4

Thread: KJ to Calories

  1. #1
    Senior Member
    Join Date
    May 2007
    Location
    Louisville, CO
    My Bikes
    Felt F75, Cervelo P2
    Posts
    360
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    KJ to Calories

    I've tried doing a couple of google searches and I've been unable to find a conversion between work(kj) to calories burned. I'm really working hard to maintain my weight through all this training and I want to be sure that I am not eating too many calories.

    Thanks
    James

  2. #2
    Senior Member
    Join Date
    Jul 2008
    Posts
    561
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  3. #3
    Quarq shill cslone's Avatar
    Join Date
    Jul 2004
    Location
    Ohio
    My Bikes
    08 Felt F4, 05 Fuji Team SL, 08 Planet X Stealth, 10 Kona Jake the Snake, 03 Giant OCR flat bar.
    Posts
    3,962
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    kJ to kCal is ~4.18 to 1.

    But if I understand correctly, since humans are only around 20-25% efficient at most on the bike, the kJ to kCal conversion is very close to 1:1. Somebody correct me if I misunderstood though.
    FS: Fuji SL1 frameset, 55.5cm toptube, excellent condition.

  4. #4
    Senior Member
    Join Date
    Oct 2003
    Posts
    1,941
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cslone View Post
    kJ to kCal is ~4.18 to 1.

    But if I understand correctly, since humans are only around 20-25% efficient at most on the bike, the kJ to kCal conversion is very close to 1:1. Somebody correct me if I misunderstood though.
    cslone is correct. If you have a powermeter that records actual work done, then for most purposes, it's good enough to consider "energy expended doing useful work" equivalent to "food energy burnt".
    Eric

    2005 Trek 5.2 Madone, Red with Yellow Flames (Beauty)
    199x Lemond Tourmalet, Yellow with fenders (Beast)

    Read my cycling blog at http://riderx.info/blogs/riderx
    Like climbing? Goto http://www.bicycleclimbs.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •