• 101
    Best Websites
    for Writers

    Subscribe to our FREE email newsletter and get the 101 Best Websites for Writers download.

Ensure vs. Insure

Categories: Brian Klems' The Writer's Dig, Grammar Rules Tags: grammar tips.
Q: Are “ensure” and “insure” interchangeable?—AnonymousA: Some stylebooks say yes, and some say no. Are you any less confused? These two words are often used in place of each other, but WD’s style separates them.WD—and many other publications—uses “insure” only when referring to financial insurance policies. After signing a contract with a professional baseball team, Jack decided to insure his pitching arm for $1 million.

When the meaning is “to make certain,” WD sticks with “ensure.” It’s my job to ensure that you don’t misuse terms like these.

There are some newspapers and magazines, such as The New York Times and The New Yorker, that still use “insure” in both instances, but it’s fairly archaic to do so. Most publications differentiate the two.


Follow me on Twitter: @BrianKlems
Sign up for my free weekly eNewsletter: WD Newsletter

Need a funny gift for Father’s Day (or any dad with a daughter)?
Order Brian’s New Book:



You might also like:

  • Print Circulation Form

    Did you love this article? Subscribe Today & Save 58%

9 Responses to Ensure vs. Insure

  1. eapoe21 says:

    I actually just found this page after reading an article in the New Yorker. See the last sentence:


    So is it true that newspapers and magazines have their own grammatical rules?

  2. sflaniken says:

    I’m with Bob… either I never noticed, or it’s just been too long!

    I just checked out your Dad’s Blog and got quite a chuckle. Thank you! I’ll go to sleep with a smile on my face!


  3. JohnA says:

    I don’t believe the two words are interchangeable, and rarely use insure when ensure will do.

    However, just to confuse the issue – as you chose to use insure as an example – in the UK, insurance refers to the kind of cover that might, or might not, pay out; e.g: car insurance – or Jack’s pitching arm. A policy that will pay out, on death or maturity, is referred to as ASSURANCE.

  4. hiramdavis says:

    I always use ‘insure’ because ‘ensure’ denotes pomposity; an attempt at trendiness. It’s like using ‘grey’, the British spelling, instead of ‘gray’. I believe writers who use ‘grey’ are striving for that same pomposity.

    • JohnA says:

      Safe to assume, then, that you see author E.L.James as extremely pompous.

      FYI, a quote – though probably not original – from the Mighty Red Pen: “I assure you that we have insured the grounds to ensure that we will be protected in case of a lawsuit stemming from an accident.”

    • Yeah, I feel that’s entirely opinion, because I don’t find them interchangeable. I only use insure when I’m speaking about the insurance of something. Ensure more for assuring something intransitive, like JohnA painted.

    • Schwarzkatz says:

      Hardly, hiramdavis! As a Brit, I don’t see them as interchangeable, and ‘grey’, to me, is the correct spelling – certainly not ‘gray’ (although we have ‘Gray’ as a surname here). I have to admit that it’s quite surprising, though, how alike both versions of the English language are, despite how far away our countries are from each other. To an English person to use ‘insure’ when ‘ensure’ is what’s needed is quite simply incorrect; ‘ensure’ is certainly not pompous! (My American daughter-in-law disagrees with some of my vocabulary!)

  5. Bob says:

    Thanks for the info about insure vs ensure, never paid attention.
    Bob Bock

Leave a Reply