Aluminum vs. Aluminium
Cambridge labels “aluminum” US and “aluminium” UK; IUPAC’s English periodic-table spelling uses “aluminium.”
Use “aluminum” in US English and “aluminium” in UK English; IUPAC uses “aluminium” in its English periodic table.
Key details
Choose the right form
| Audience / authority | Preferred spelling | Reason |
|---|---|---|
| US English | aluminum | Cambridge labels this as the US spelling. |
| UK English | aluminium | Cambridge labels this as the UK spelling. |
| IUPAC English periodic-table context | aluminium | IUPAC uses “aluminium” in its English periodic table. |
| Quoted brand, title, or official text | preserve source spelling | Do not silently regionalize proper or quoted wording. |
Quick tests
Regional-style test
Is the document following US English?
If yes: Use “aluminum.”
If no: Use “aluminium” for UK English or where the governing scientific/house style specifies it.
Caveat: The spellings name the same chemical element; the difference here is regional/style convention, not a different substance.
Examples
US style: The frame is made of aluminum.
“Aluminum” matches US usage.
UK style: The frame is made of aluminium.
“Aluminium” matches UK usage.
IUPAC’s English periodic table uses aluminium.
This follows the reviewed IUPAC spelling.
Further guidance
Core difference
Use “aluminum” in US English and “aluminium” in UK English; scientific organizations or house styles may specify one form.
Fast Test
Match the form to the intended meaning, regional convention, or required house style, then keep that choice consistent.
Variant Boundary
Both forms refer to the same chemical element; the difference is naming/spelling convention, not a different substance.
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.
- Aluminum — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · US spelling of aluminium
- Aluminium — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · UK aluminium form and US aluminum counterpart
- Periodic Table — IUPAC (opens in a new tab)IUPAC · IUPAC English element spellings include sulfur and aluminium