Commitment vs Promise

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

Commitment

Top 2,000 (common) B2 noun

Promise

Top 1,000 (very common) A2 verb

Most common: Promise

	Commitment	Promise
Pronunciation	🇬🇧 /["/kəˈmɪtmənt/"]/ 🇺🇸 /["/kəˈmɪtmənt/"]/	🇬🇧 /["/ˈprɒmɪs/","/ˈprɒmɪsɪz/","/ˈprɒmɪst/","/ˈprɒmɪsɪŋ/"]/ 🇺🇸 /["/ˈprɑːmɪs/","/ˈprɑːmɪsɪz/","/ˈprɑːmɪst/","/ˈprɑːmɪsɪŋ/"]/
Meaning	A promise to do something or stay loyal.	A commitment to do something or not do something.
Example	His commitment to the project ensured its success.	I promise to help you with your homework.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 1,000 (very common)
CEFR level	B2	A2
Part of speech	noun	verb
Collocations	absolute, complete, full, degree, level, give, make, demonstrate, commitment on, commitment to, a lack of commitment, absolute, complete, full, degree, level, give, make, demonstrate, commitment on, commitment to, a lack of commitment, big, considerable, major, have, take on, fulfil/​fulfill, commitment on, heavy, time, commitment of	faithfully, solemnly, initially, can, cannot, seem to, to, as promised, I can’t promise anything
Antonyms	disloyalty, indifference	lie, break, betray
Common mistakes	Using 'commitment' without specifying what it's to., Confusing 'commitment' with 'commit' as a verb., 'Commitment' often misused in informal contexts.	Confusing 'promise' with 'vow' or 'pledge' in terms of strength., Using 'promise' without an object (e.g., 'I promise' should specify what)., Misusing in the past tense (e.g., 'I promised' without a follow-up).
Usage notes	Used when discussing promises or obligations in personal or professional contexts. It's generally appropriate in serious discussions and may not fit casual chatting.	Use 'promise' when you want to express a vow or assurance. Common in both spoken and written contexts, but avoid in formal legal documents.

See it in real clips

That's a pretty big commitment. Well, not if the Mob has their way.

Commitment

And one system shows promise.

and I always try to keep my promise.

And one system shows promise.

and I always try to keep my promise.

Promise

Frequently asked questions: Commitment vs Promise

What's the difference between Commitment and Promise?

Commitment: A promise to do something or stay loyal. Promise: A commitment to do something or not do something.

Which is more common: Commitment and Promise?

Promise is the most common in everyday English.

Which is more advanced: Commitment and Promise?

Commitment is the highest level, at B2, on the CEFR scale.

Are Commitment and Promise the same CEFR level?

Commitment: B2, Promise: A2 on the CEFR scale.

What part of speech are Commitment and Promise?

Commitment: noun, Promise: verb.

Can you show an example of each?

Commitment: His commitment to the project ensured its success. Promise: I promise to help you with your homework.

Can I use Commitment and Promise interchangeably?

Not always. Commitment and Promise 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.