Guarantee vs Promise me

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

Guarantee

Top 2,000 (common)B2verb

Promise me

Top 2,000 (common)
 GuaranteePromise me
Pronunciation🇬🇧 /["/ˌɡærənˈtiː/","/ˌɡærənˈtiːz/","/ˌɡærənˈtiːd/","/ˌɡærənˈtiːɪŋ/"]/🇺🇸 /["/ˌɡærənˈtiː/","/ˌɡærənˈtiːz/","/ˌɡærənˈtiːd/","/ˌɡærənˈtiːɪŋ/"]/🇬🇧 //ˈprɒmɪs miː//🇺🇸 //ˈprɑːmɪs mi//
MeaningA promise that something will happen or be done.Say you'll do something or keep a secret.
ExampleI can guarantee that you will enjoy this movie.Please, promise me you'll be there tomorrow.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelB2-
Part of speechverb
Collocationsabsolutely, personally, constitutionally, be able to, can, be fully guaranteed, absolutely, almost, practicallymake a promise, keep a promise, broken promise, if you promise, promise to
Antonymsdoubt, uncertainty, dispute-
Common mistakesConfused with 'ensure' — 'guarantee' implies a stronger promise., Incorrectly using 'guarantee' without a direct object — always specify what is guaranteed., Mixing up 'guaranteed' as an adjective instead of a past participle.Confused about who can promise - both people can make a promise., Using it without a specific object or context., Overusing it in casual conversations.
Usage notesUse 'guarantee' when you want to express certainty about an outcome. It's suitable for both written and spoken English, but avoid in casual conversations where simpler words like 'promise' may suffice.Typically used in informal contexts. Avoid in overly formal situations.

See it in real clips

Guarantee
Promise me

Frequently asked questions: Guarantee vs Promise me

What's the difference between Guarantee and Promise me?

Guarantee: A promise that something will happen or be done. Promise me: Say you'll do something or keep a secret.

Can you show an example of each?

Guarantee: I can guarantee that you will enjoy this movie. Promise me: Please, promise me you'll be there tomorrow.

Can I use Guarantee and Promise me interchangeably?

Not always. Guarantee and Promise me 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.

Related comparisons