Don't matter though vs It doesn't matter vs No big deal

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

Don't matter though

InformalTop 3,000 (common)

It doesn't matter

Top 1,000 (very common)

No big deal

InformalTop 2,000 (common)
Most formal: It doesn't matterMost common: It doesn't matter
 Don't matter thoughIt doesn't matterNo big deal
Pronunciation🇬🇧 //dəʊnt ˈmætə ðəʊ//🇺🇸 //doʊnt ˈmæɾər ðoʊ//🇬🇧 //ɪt ˈdʌzənt ˈmætə//🇺🇸 //ɪt ˈdʌzənt ˈmætər//🇬🇧 //nəʊ bɪg diːl//🇺🇸 //noʊ bɪɡ diːl//
MeaningIt doesn't matter, anyway.It is not important.Not important or serious.
ExampleI didn't pass the test, but it don't matter though.I forgot my book, but that’s okay; it doesn’t matter.When she apologized for being late, I said, 'It's no big deal.'
RegisterInformalNeutralInformal
How commonTop 3,000 (common)Top 1,000 (very common)Top 2,000 (common)
Collocationsit don't matter though, doesn't matter though, but it don't matter thoughdoesn't matter what, it doesn't matter if, doesn't matter anymoremake it no big deal, say no big deal, treat as no big deal
Antonymsmatters a lot, important, significantit matters, is important-
Common mistakesUsing 'doesn't' instead of 'don't' in informal contexts., Forgetting to use 'though' at the end., Overusing it in contexts needing formality.Confused with 'it matters', Using in overly formal situations, Incorrectly applying in serious contextsUsed in formal contexts where seriousness is expected., Confused with 'no big idea' which has a different meaning., Mispronounced or used too seriously.
Usage notesCommonly used in casual conversation to downplay significance. Avoid in formal writing or settings.Used to indicate that something is not significant or does not affect the outcome. Appropriate in both casual and formal contexts, but can sound dismissive if overused.Commonly used in casual conversations to downplay a situation. Avoid in formal contexts.

See it in real clips

Don't matter though
It doesn't matter
No big deal

Frequently asked questions: Don't matter though vs It doesn't matter vs No big deal

What's the difference between Don't matter though, It doesn't matter, and No big deal?

Don't matter though: It doesn't matter, anyway. It doesn't matter: It is not important. No big deal: Not important or serious.

Which is more formal: Don't matter though, It doesn't matter, and No big deal?

It doesn't matter is the most formal of these.

Which is more common: Don't matter though, It doesn't matter, and No big deal?

It doesn't matter is the most common in everyday English.

Can you show an example of each?

Don't matter though: I didn't pass the test, but it don't matter though. It doesn't matter: I forgot my book, but that’s okay; it doesn’t matter. No big deal: When she apologized for being late, I said, 'It's no big deal.'

Can I use Don't matter though, It doesn't matter, and No big deal interchangeably?

Not always. Don't matter though, It doesn't matter, and No big deal 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.