Not a big deal vs Such a little thing

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

Not a big deal

InformalTop 2,000 (common)

Such a little thing

InformalBeyond 10,000 (less common)
Most common: Not a big deal
 Not a big dealSuch a little thing
Pronunciation🇬🇧 //nɒt ə bɪɡ diːl//🇺🇸 //nɑt ə bɪɡ dil//🇬🇧 //sʌtʃ ə ˈlɪt(ə)l θɪŋ//🇺🇸 //sʌtʃ ə ˈlɪt(əl) θɪŋ//
MeaningNot important or serious.a small or unimportant matter
ExampleWhen I spilled my drink, I just said, 'It's not a big deal.'Don't worry about it, it's just such a little thing.
RegisterInformalInformal
How commonTop 2,000 (common)Beyond 10,000 (less common)
Collocationsit's not a big deal, not a big deal to me, make it not a big dealfocus on such a little thing, worry about such a little thing, make a fuss over such a little thing
Common mistakesSaying 'not big deal' without 'a'., Using it in formal writing., Confusing with 'not important' which can sound harsher.Used in formal writing contexts, Confused with 'such small things', Misplaced emphasis can change the meaning
Usage notesUsed in casual conversations to downplay a situation. Avoid in formal contexts or serious discussions.Use this phrase in casual conversations to minimize the importance of an issue. It is not suitable for formal contexts.

See it in real clips

Not a big deal
Such a little thing

Frequently asked questions: Not a big deal vs Such a little thing

What's the difference between Not a big deal and Such a little thing?

Not a big deal: Not important or serious. Such a little thing: a small or unimportant matter

Which is more common: Not a big deal and Such a little thing?

Not a big deal is the most common in everyday English.

Can you show an example of each?

Not a big deal: When I spilled my drink, I just said, 'It's not a big deal.' Such a little thing: Don't worry about it, it's just such a little thing.

Can I use Not a big deal and Such a little thing interchangeably?

Not always. Not a big deal and Such a little thing 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.