Fit or Fitted? Difference Explained (Helpful Examples)

The past tense of “fit” is a little confusing because it’s an irregular verb form. It comes with two different past tense types, and we need to know how both work before we can use it correctly in a sentence. This article will help you with those forms.

Fit or Fitted: Which Is Correct?

“Fit” and “fitted” are both correct. Incidentally, both work as the simple past tense or the past participle, but it mostly comes down to whether using American or British English. Typically, “fit” is the simple past tense, while “fitted” is the past participle.

Fit or Fitted: Which Is Correct?

These examples will show you what the key differences between the tenses are:

  • I fit/fitted into my clothes last weekend, which was lucky.
  • You have fitted/fit into those for years! It’s time for an upgrade!

Unlike some other irregular past tense verbs, it seems like “fit” is the same form depending on which language you write with.

PastFit / Fitted
Past ParticipleFit / Fitted

When Is “Fit” Correct?

“Fit” is correct as the simple past tense and the past participle. We can use it on its own (i.e., “I fit in with them”) or with an auxiliary verb (i.e., “I have fit the pieces together”).

Typically, American English uses “fit” as the only acceptable verb form. They will use it as both the simple past tense and the past participle.

British English tends to use “fit” and “fitted” as the simple past tense, though “fit” is more common. However, “fitted” is much more popular in British English as the past participle.

Example Sentences Using “Fit”

Since “fit” can apply to do different verb forms, we’ll include examples covering them both.

  1. I’m sure I fit into this the other weekend!
  2. We fit together a long time ago.
  3. You fit into this group long before me.
  4. We had fit the screws into the system before the day ended.
  5. You have fit in well with the group, as I knew you would.
  6. I will have fit these shelves into the wall by the end of the day if you give me time.

“Fit” is the simple past tense and past participle of the present tense verb “fit.” You mostly use it as the simple past tense in British English, but in American English, it can also extend to be the past participle (i.e., “have fit”).

When Is “Fitted” Correct?

“Fitted” is also correct in both forms. It’s much more common in British English as both a simple past tense form and a past participle form, but we want to focus on the present tenses here.

“Fitted” is correct when an auxiliary verb is present in the sentence. We can use a verb like “have” to demonstrate this, with the phrase “have fitted” being the present perfect tense. “I fitted” or “you fitted” are common constructs in the simple past tense as well.

“Fitted” is the past participle of the verb “to fit.” We can use it with an auxiliary verb to turn it into a correct tense. However, unlike some other past participle forms, “fitted” is also capable of having meaning on its own in a sentence.

You should do one of the following to create one of the three perfect tenses:

  • Past perfect: Had fitted
  • Present perfect: Have fitted
  • Future perfect: Will have fitted

We could also use it in the following ways as the simple past tense (though these are mostly for British English users).

  • I fitted
  • She fitted
  • He fitted

Example sentences using “Fitted”

There are four different sections we could walk you through here, so we’ll do just that.

Simple Past Tense

  1. We fitted the machine with a device that will help us to detect more problems in the future.
  2. You fitted the products together, which was very impressive.

“Fitted” works as the simple past tense to talk about “fitting” something in the past. It’s often used to reminisce about something happening previously, with nothing more to impact it in the present.

Past Perfect

  1. I had fitted into this dress once, but that was a long time ago.
  2. You had fitted into this group a long time before I ever came close!

“Had fitted” is the past perfect tense. We use it to talk about something “fitting” in the past, but that is no longer affected by anything in the present. Typically, we refer to an order of how things happened, using words like “before” in the past perfect.

Present Perfect

  1. I have fitted the boxes together as you asked me to.
  2. We have fitted in with every social group we’ve been introduced to so far!

“Have fitted” is the present perfect tense. We use it to talk about “fitting” in the past but continuing the action or finishing it up in the present. It can refer to something that happened merely a few seconds ago if the context allows it.

Future Perfect

  1. I will have fitted into this dress for the third time in a row if I keep on top of this diet!
  2. You will have fitted the screws by the end of the day if you just read the instructions!

“Will have fitted” is the future perfect tense. We use it to talk about a future scenario that has yet to happen, but there is some kind of guarantee in place that makes it likely to happen. We typically include an “if” clause in the same way to demonstrate it.

“Have Fit” Vs. “Have Fitted”

Since both “fit” and “fitted” are the past participle forms of the verb “to fit,” we’re left with an interesting choice.

“Have fit” and “have fitted” are both correct. Generally, “have fit” is more common in American English, while “have fitted” is more common in British English. However, both forms are correct in both languages.

  • Correct: I have fit in well with the group, just like I knew I would.
  • Correct: You have fitted in well for as long as I can remember.

Final Thoughts

Unlike most past tense forms of irregular verbs, “fit” and “fitted” are interchangeable. Both are the simple past tense and the past participle, with “fit” being the most popular choice for both cases in American English. British English values both, with “fit” as the simple and “fitted” as the participle.

You may also like: Drew or Drawn: Which Is Correct? (Helpful Examples)