Per mil

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Per mil
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A per mil, per mille, or per mill (permil or permille) (Latin, literally meaning 'for (every) thousand') is a tenth of a percent or one part per thousand. It is written with U+2030 per mille sign (HTML: ‰ ‰) (Windows: ALT+0137), which looks like a percent sign (%) with an extra zero at the end. It can be seen as a stylized form of the three zeros in the denominator, although it originates from an alteration of the percent sign.

A railroad distance sign in the Czech Republic with a 20‰ grade, which equates to 2%

The term occurs so rarely in English that major dictionaries do not agree on the spelling or pronunciation (even within one dialect of English) and often do not list the other variants or do not even have an entry (for example Longman, and Macmillan).[1][2][3][4][5] The term is very common in most other languages, for example in expressing blood alcohol content, usually[6] expressed in percentage terms in English-speaking countries.

A per mil is defined as:

1‰ = 10−3= 11000 = 0.001 = 0.1%
1% = 10‰

A per mil should not be confused with ppm (commonly pronounced "parts per million"). A measurement in ppm means parts per million, and has as its denominator 1,000,000 and not 1,000.


Examples of common use include:

  • expressing costs for print and online advertisements which are commonly sold at cost per mille (CPM); this is the common unit for all banner and display advertising
  • frequently used by email service providers to denominate the cost for 1,000 emails delivered as a cost per mille (CPM)

Related units[edit]


  1. ^ "Per mill - Definition and More from the Free Merriam-Webster Dictionary". Retrieved 2012-08-31. 
  2. ^ "per mil - Dictionary definition and pronunciation - Yahoo! Education". Retrieved 2012-08-31. 
  3. ^ "Definition of per mille - Oxford Dictionaries (British & World English)". Oxford Dictionaries. Retrieved 2012-08-31. 
  4. ^ "per mille adverb - definition in Business English Dictionary - Cambridge Dictionary Online". 2012-08-16. Retrieved 2012-08-31. 
  5. ^ "Definition of per mil". Collins English Dictionary. Retrieved 2012-08-31. 
  6. ^ "The official New Zealand road code - About limits". 2011-10-07. Retrieved 2012-08-31.