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Calories in a slice of onion

There are:

  • 4 calories in one thin slice of raw onion
  • 6 calories in one medium slice of raw onion
  • 15 calories in one thick slice (about a ¼" thick) of raw onion

For the calorie content of other vegetables and for avegetable calorie chart, which you may print out if you wish to and use as a daily guide, see the page link, further down this page, listed under Related Questions.

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12y ago

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