I have found a similar topic addressing the use of "comprise" but my question is not exactly in line with that one. I did ask this question there to keep the topic related to the use of "comprise" but it was removed since I did not follow protocol. So my apologies if this seems like a duplicate entry.

When does one use "comprises of" and when "comprise"? Are they interchangeable?

For example:

"My name comprises 5 letters"

"My name comprises of 5 letters"

Which is correct? Or are they both acceptable?

  • 1
    This much I know, but other sources I have found indicate an increased usage of "of" in recent years, showing acceptance of the word. Have a look at the discussion labelled "Compose and Comprise" Mar 19, 2013 at 9:36

2 Answers 2


A quick look in a decent online dictionary is advisable:

comprise Usage: The use of of after comprise should be avoided:

the library comprises (not comprises of) 500 000 books and manuscripts Collins English Dictionary – Complete and Unabridged Collins.

I don't think US usage is any different.

Another quote, from the internet (repunctuated):

Never use 'comprise of' or 'comprises of' - but 'comprised of' is allowed.

This is a passive (or arguably adjectival) usage involving comprised which some consider to be ungrammatical (see http://grammarsource.com/2007/03/26/comprised-v-is-comprised-of/ ) .


I support Mr Edwin Ashworth. When used in the active voice, COMPRISE is not followed by OF but when used in the passive voice, it is followed by OF: The programme comprises two short plays. The programme is comprised of two short plays.

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