After vs Upon

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

After

Top 1,000 (very common) A1 preposition

Upon

Formal Beyond 10,000 (less common) B1 preposition

Most formal: Upon Most common: After

	After	Upon
Pronunciation	🇬🇧 /["/ˈɑːftə(r)/"]/ 🇺🇸 /["/ˈæftər/"]/	🇬🇧 /["/əˈpɒn/"]/ 🇺🇸 /["/əˈpɑːn/"]/
Meaning	Later in time than something else.	on or at a particular time or place
Example	We will go to the park after lunch.	mile upon mile of dusty road
Register	Neutral	Formal
How common	Top 1,000 (very common)	Beyond 10,000 (less common)
CEFR level	A1	B1
Part of speech	preposition	preposition
Collocations	after school, after work, after dinner, after the event	upon arrival, upon request, upon reflection, upon hearing, upon completion
Antonyms	before	after, below, underneath
Common mistakes	Using 'after' with past tenses incorrectly, e.g., 'after I ate' should be linked with a past event., Confusing 'after' with 'before' in timeline contexts., Misplacing 'after' in a sentence, leading to unclear meaning.	Confused with 'on' in casual speech., Used inappropriately in informal settings., Misunderstood as a preposition that can replace any instance of 'on'.
Usage notes	Used to indicate time. Common in both spoken and written English. Avoid using in very formal contexts without a clear time reference.	Used in more formal contexts, often in writing. Not commonly used in everyday spoken English. Avoid in casual conversations.

See it in real clips

The Lord Of The Rings › The return of the king

I stood upon the brink.

when I lay My vengeance upon thee !"

The Lord Of The Rings › The Fellowship Of The Ring

All who look upon her...

The Lord Of The Rings › The return of the king

I stood upon the brink.

when I lay My vengeance upon thee !"

Upon

Frequently asked questions: After vs Upon

What's the difference between After and Upon?

After: Later in time than something else. Upon: on or at a particular time or place

Which is more formal: After and Upon?

Upon is the most formal of these.

Which is more common: After and Upon?

After is the most common in everyday English.

Which is more advanced: After and Upon?

Upon is the highest level, at B1, on the CEFR scale.

Are After and Upon the same CEFR level?

After: A1, Upon: B1 on the CEFR scale.

What part of speech are After and Upon?

After: preposition, Upon: preposition.

Can you show an example of each?

After: We will go to the park after lunch. Upon: mile upon mile of dusty road

Can I use After and Upon interchangeably?

Not always. After and Upon 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.