Fulfill vs. Fulfil
“Fulfill” and “fulfil” are regional base-form spellings of the same verb. Cambridge identifies fulfill as US and fulfil as mainly UK, while also showing doubled-l inflected forms such as fulfilled.
Use “fulfill” in US English and “fulfil” in UK-oriented English; inflected forms such as “fulfilled” still double the final l.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| US base form | fulfill | Use “fulfill” in US English. |
| mainly UK base form | fulfil | Use “fulfil” in UK-oriented English. |
| inflected forms | fulfilled / fulfilling | Do not infer that every inflected form keeps a single final l. |
Quick tests
Meaning / construction test
Are you choosing the base form for a regional variety?
If yes: Use “fulfill” in US English and “fulfil” in mainly UK usage.
If no: For inflected forms, use the documented doubled-l forms such as “fulfilled” and “fulfilling.”
Caveat: This is a regional base-spelling distinction; the inflected forms should be checked separately rather than generated mechanically.
Examples
We aim to fulfill every requirement.
“Fulfill” is the US base spelling.
The programme must fulfil its stated purpose.
“Fulfil” is mainly UK for the same verb.
The team fulfilled the contract on time.
The inflected form uses doubled l.
Further guidance
Core difference
“Fulfill” is the standard US spelling and “fulfil” is mainly UK for the same verb.
Fast Test
Use the base spelling required by the intended variety and keep that convention consistent.
Variant Boundary
The distinction concerns the base spelling; the cited fulfil entry also shows “fulfilled” and “fulfilling,” so do not infer a one-l rule for every inflected form.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- FULFILL — Cambridge Dictionary (opens in a new tab)Cambridge University Press · US spelling of fulfil
- FULFIL — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Mainly UK fulfil; US usually fulfill