I can't believe I said that vs That's unbelievable

When to use each in English, with meaning, register, and examples.

I can't believe I said that

Top 5,000 (fairly common)

That's unbelievable

Top 2,000 (common)
Most common: That's unbelievable
 I can't believe I said thatThat's unbelievable
Pronunciation🇬🇧 //aɪ kɑːnt bɪˈliːv aɪ sæd ðæt//🇺🇸 //aɪ kænt bɪˈliv aɪ sæd ðæt//🇬🇧 //ðæts ˌʌnˈbiːləvəbl//🇺🇸 //ðæts ˌʌnˈbiːləvəbəl//
MeaningA phrase used to express shock or disbelief about something you said.It's hard to believe; it's shocking.
ExampleI can't believe I said that during the meeting!When she won the lottery, I thought, 'That's unbelievable!'
RegisterNeutralNeutral
How commonTop 5,000 (fairly common)Top 2,000 (common)
Collocationscan't believe, I said that, believe it, said it out loud, incredibly shockedThat's unbelievable news, That's unbelievable behavior, That's unbelievable luck
Common mistakesUsing it in overly formal situations., Misplacing 'that'; it should follow 'said', not precede it., Not using appropriate tone; it can sound sarcastic.Used in negative situations instead of positive ones., Saying 'This is unbelievable' instead of 'That's unbelievable' in conversations., Confusing with 'That's incredible' which has a more positive connotation.
Usage notesUse this phrase in informal contexts when you are surprised or regret what you just said. It expresses disbelief or frustration and may not be suitable for formal occasions.Commonly used in casual conversation to express surprise or disbelief. Avoid in overly formal settings.

See it in real clips

I can't believe I said that
That's unbelievable

Frequently asked questions: I can't believe I said that vs That's unbelievable

What's the difference between I can't believe I said that and That's unbelievable?

I can't believe I said that: A phrase used to express shock or disbelief about something you said. That's unbelievable: It's hard to believe; it's shocking.

Which is more common: I can't believe I said that and That's unbelievable?

That's unbelievable is the most common in everyday English.

Can you show an example of each?

I can't believe I said that: I can't believe I said that during the meeting! That's unbelievable: When she won the lottery, I thought, 'That's unbelievable!'

Can I use I can't believe I said that and That's unbelievable interchangeably?

Not always. I can't believe I said that and That's unbelievable are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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