Ought vs Should

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

Ought

Formal Top 3,000 (common) B1

Should

Top 1,000 (very common) A1

Most formal: Ought Most common: Should

	Ought	Should
Pronunciation	🇬🇧 //ɔːt// 🇺🇸 //ɔt// Hear Ought	🇬🇧 /["/ʃəd//ʃʊd/","/ˈʃʊdnt/"]/ 🇺🇸 /["/ʃəd//ʃʊd/","/ˈʃʊdnt/"]/ Hear Should
Meaning	should or must do something	used to tell someone what is the right thing to do
Example	You ought to apologize for your mistake.	You should study for the exam to do well.
Register	Formal	Neutral
How common	Top 3,000 (common)	Top 1,000 (very common)
CEFR level	B1	A1
Collocations	ought to know, ought to be, ought to do	should do, should have, should not, should consider, should remember
Antonyms	ought not, should not	must not, shall not
Common mistakes	Confused with 'should' – they are similar but 'ought' sounds more formal., Using 'ought' without 'to', e.g., 'You ought study.' which is incorrect., Incorrectly using 'ought' in negative forms like 'oughtn't' in some dialects.	'Should' is often confused with 'must,' leading to weaker advice than intended., Forget to follow 'should' with the base form of the verb, e.g., saying 'should goes' instead of 'should go.', Using 'should' for past events instead of 'should have.'
Usage notes	Use 'ought' in advising or suggesting. It sounds more formal than 'should' and is less common in everyday conversation.	Use 'should' for advice, suggestions, or expectations. It's appropriate in both spoken and written English, but avoid it in very formal contexts where 'ought to' might be preferred.

Frequently asked questions: Ought vs Should

What's the difference between Ought and Should?

Ought: should or must do something Should: used to tell someone what is the right thing to do

Which is more formal: Ought and Should?

Ought is the most formal of these.

Which is more common: Ought and Should?

Should is the most common in everyday English.

Are Ought and Should the same CEFR level?

Ought: B1, Should: A1 on the CEFR scale.

Can I use Ought and Should interchangeably?

Not always. Ought and Should 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.