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I am a little bit confused about using units in English, sometimes I hear that people use singular units for plural things, sometimes they use plural ones. Which one is correct?

  • 3 meter(s) long?
  • during a 2 week(s) period?
  • 0.5 dollar(s)
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3 Answers

In Standard English, this crucially depends on whether the phrase is prenominal or not. Prenominally, the phrase will not show plural marking, while elsewhere it will have the normal plural marking, as appropriate.

Compare:

  • The bureau is 3 meters long.
  • This is a 3-meter-long bureau. (prenominal)


  • The period is 2 weeks.

  • This is a 2-week period. (prenominal)


  • The bill was 0.50 dollars.

  • This is a 0.50-dollar bill. (prenominal)

Note also that a hyphen is normally inserted to connect the words in the adjectival phrase when the phrase is prenominal.

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Are you sure you should use plural even refering to less-than-one numbers? Wouldn't it be 0.50 dollar? –  Ciwee Apr 22 '11 at 3:20
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@Ciwee: Yes, I am sure. You should probably read this answer from another question. –  Kosmonaut Apr 22 '11 at 12:16
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The only time this doesn't hold true is if the stated quantity is 1. Only 1, if it's 1.00001 then it's plural again. The dresser is 1 meter long. It will take 1 week to get there. The bill was 1 dollar and some change. The bill was 1.15 dollars. The bill was one dollar and 15 cents. The bill was 1 dollar and 1 cent. Even plural with 0. The bill was 0 dollars and 86 cents. I have 0 apples and 1 orange. –  Phoenix Nov 24 '11 at 9:09
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See the NIST check list for a good concise reference about units in general. For hyphenated compound adjectives, which are in the singular: 3-meter long, a 2-week period. For the plural of noninteger quantities, the rule is that everything other than 1 uses the plural: 0.5 dollars.

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Don't forget that currencies are a special case. See e.g. €10 = “ten euro” or “ten euros”?, Pluralization of currencies like the baht and the ringgit. –  RegDwigнt Apr 21 '11 at 19:11
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Uhm so in English it's correct to say Euros? In Italian, for example, the plural would be "Euri" and it's absolutely wrong. –  Alenanno Apr 21 '11 at 20:19
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It is common in informal spoken English, at least American, to omit the plural.

I got me a new fish pole, ten foot long!

Correct usage would be to say, "ten feet long."

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Correct usage would be to say "I bough a new fish pole..." –  Brian Carlton May 30 '12 at 18:39
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