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Are "that's it" and "that's all" interchangeable? Is there any specific case where I should use one instead of the other?

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Can you provide some example sentences so we have a broader context for these expressions? – Kristina Lopez Feb 12 '13 at 18:34
What about "That's all it is?" – FumbleFingers Feb 13 '13 at 16:42

That's it is an expression that means:

1 that is the main point or difficulty: “Is she going?” “That's just it—she can't make up her mind.” 2 that is enough or the end: okay, that's it, you've cried long enough.

Ref: The OED


  1. used to say that something has ended Well, that's it, we've finished - we can go home now. That's it! I'm not putting up with any more of her rudeness.
  2. used to say that something is correct You switch the computer on at the back. That's it.


That's all doesn't seem to be an expression all by itself, but means that there's nothing more to it, that's all you have to do, etc.

So in some cases, as in the second example from the Cambridge Dictionary, they could be used the same way with a slight difference in meaning.

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"That's all doesn't seem to be an expression all by itself" -- You forget the Merrie Melodies Porky Pig signoff: "That's all, folks!" youtube.com/watch?v=aNEd0_rm6kU – Alex Chaffee Feb 12 '13 at 19:54
What about "Well, that's all, we've finished"? Isn't that sentence correct? – Ayozint Feb 12 '13 at 20:38
Or, "is that all?" "Yes, that's all." – Kristina Lopez Feb 12 '13 at 21:10

They are more or less interchangeable when they indicate the peremptory end of a discussion. On most other occasions, they are not.

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