English UsageComparison guide

Aluminum vs. Aluminium

Cambridge labels “aluminum” US and “aluminium” UK; IUPAC’s English periodic-table spelling uses “aluminium.”

Quick answer

Use “aluminum” in US English and “aluminium” in UK English; IUPAC uses “aluminium” in its English periodic table.

Key details

Confusion Familyregional-spelling
Rule Familyregional-orthography
Termsaluminum, aluminium
Variant ScopeCambridge labels “aluminum” US and “aluminium” UK; IUPAC’s English periodic-table spelling uses “aluminium.”

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.

  1. Aluminum — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · US spelling of aluminium
  2. Aluminium — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · UK aluminium form and US aluminum counterpart
  3. Periodic Table — IUPAC (opens in a new tab)IUPAC · IUPAC English element spellings include sulfur and aluminium

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