British vs American English: The Complete Difference Guide

Spelling Differences

The most obvious differences are in spelling. Here are the main patterns.

-our vs -or: British English uses colour, honour, favour, behaviour, neighbour. American English drops the u: color, honor, favor, behavior, neighbor.

-ise vs -ize: British prefers organise, recognise, realise, apologise. American uses organize, recognize, realize, apologize. Both forms are technically acceptable in British English, but -ise is strongly preferred in UK academic writing and publishing.

-re vs -er: Centre, theatre, metre, fibre in British. Center, theater, meter, fiber in American.

-ence vs -ense: Defence, licence (noun), offence in British. Defense, license, offense in American.

Double consonants: British English doubles them more often. Travelling, cancelled, jewellery. American keeps it single: traveling, canceled, jewelry.

Grammar Differences

Collective Nouns

This trips people up constantly. In British English, "the team are playing well" treats the team as multiple individuals. In American English, "the team is playing well" treats it as a single unit. Both are correct in their context.

Past Tense Preferences

British English leans toward "I've just eaten" and "Have you finished?" American English often uses "I just ate" and "Did you finish?" The British version uses present perfect; the American uses simple past.

Prepositions

British: "at the weekend," "in hospital," "different from." American: "on the weekend," "in the hospital," "different than." These small differences can make a text feel foreign to readers from the other side of the Atlantic.

Vocabulary

Some words are completely different. Lift vs elevator. Boot vs trunk. Petrol vs gas. Pavement vs sidewalk. Torch vs flashlight. Queue vs line. Post vs mail. These aren't right or wrong. They're just different conventions.

Why Consistency Matters

Pick one variant and stick with it throughout your document. Mixing "colour" and "organize" in the same essay looks sloppy. It signals you haven't proofread carefully.

Our Grammar Checker supports both British and American English. Select your preferred variant and it flags any inconsistencies. If you've chosen British English, it'll flag "color" as an error.