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When writing a quote for an order for products, would you write

25K or 25M to refer to 25,000 parts or pounds or units?

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25K for 25,000, 25M for 25,000,000. –  Mitch Apr 23 '13 at 23:34
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If you're writing a quote, make it explicit and write 25000. –  Andrew Leach Apr 23 '13 at 23:35
    
    
@RegDwighт English numeric abbreviations aren't quite the same as binary prefixes: For example, they generally use uppercase K for thousands and B for billions instead of giga. –  Bradd Szonye Apr 23 '13 at 23:56
    
@Bradd point taken, but that information, too, is to be found on Wikipedia, in fact by following links from that article. Not to mention that in either system the two letters in question mean the same thing, so this is really a non-starter. My comment is only there because when closing a question as general reference, it is considered good practice to provide a link to the "internet reference source designed specifically to find that type of information". In this case that's Wikipedia. Strictly speaking it would be sufficient to link to its home page, or the article on the letter M. –  RegDwigнt Apr 24 '13 at 1:21
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closed as general reference by RegDwigнt Apr 23 '13 at 23:49

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer

In English numeric abbreviations and currency:

  • K for thousand (from kilo)
  • M for million
  • B for billion
  • T for trillion

In metric prefixes for SI measurements:

  • k for thousand (note lowercase)
  • M for million (from mega)
  • G for billion (from giga)
  • T for trillion (from tera)

Therefore, 25K is 25,000 units. You could also write 25k (lowercase k). These abbreviations are appropriate for summary text but not itemized lists or tables. In that case, should not abbreviate (although you may specify all numbers in thousands in the legend if appropriate).

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