I am writing a summary for a facebook campaign, and I want to say "each post reaches over 1000 viewers in average", does it sound right? Should I use "on average" or "in average"?

  • 1
    This question appears to be off-topic because it needs to be asked on ELL. The OP's suggestion of the preposition in seems to be based on a non-native tendency.
    – Kris
    Commented Oct 13, 2013 at 11:15

2 Answers 2


If you do a Google ngram search you'll realize starting in the '60s more people had the tendency to use the preposition on before average although a search in Corpus Contemporary American English would suggest that the expression in average can still be seen in published books nowadays, but they are normally used with average as an adjective in sentences like "There is an increase in average sale."

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Therefore I would advice you to go for the expression "on average" instead.

  • On average and on the average are identical and mean the same thing. They are adverbial idioms and may appear first, last, or in most adverb niches. Commented Oct 12, 2013 at 20:31
  • Good illustration that the figures for 'in average' are highly skewed. I'm surprised that some valid examples can be found. Commented Jun 21 at 14:01

"on (or : on an) average" is sole in use.

  • 2
    What that opinion, or do you have a reference?
    – GEdgar
    Commented Oct 12, 2013 at 20:29
  • @GEdgar Yes, Oxford, Collins, and Harrap's Commented Oct 12, 2013 at 20:48
  • Then please link to them or otherwise indicate a source. What does "is sole in use mean?
    – TrevorD
    Commented Oct 12, 2013 at 23:23

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