British vs American English: the spelling, words and grammar that differ

You arrange to meet a friend on the first floor.

You wait by the front door. Your friend waits upstairs. Neither of you is wrong. In British English, the first floor is the one above the ground floor. In American English, the first floor is the ground floor.

That is British vs American English in one small story. The two are the same language, with nearly all the same grammar and words. Here and there they part ways, and each of those places is easy to handle once you know it.

Here they are: the spelling, the everyday words, the grammar, and the few habits of writing that show which side of the Atlantic a sentence comes from.

British vs American spelling

Spelling is where the difference shows most on the page. The good news: most of it follows a handful of patterns. Learn them and most of the differences take care of themselves.

Many American spellings go back to one man. Noah Webster, the American dictionary-maker, argued for simpler spellings in the early 1800s, and his American Dictionary of the English Language (1828) used color, center and defense. His spellings became the American standard. British English kept the older forms.

-our and -or

British English writes colour, flavour, honour, humour, neighbour and favourite. American English drops the u: color, flavor, honor.

One honest note. The British u sometimes disappears too, when an ending is added. Humour gives humorous, and honour gives honorary, in British English as well. But colourful and honourable keep it. When in doubt, check a dictionary.

-re and -er

British centre, theatre, fibre, litre and metre become American center, theater, fiber, liter and meter. In British English a metre is a length and a meter is a device that measures, like a gas meter.

-ise and -ize

This is the one people argue about. American English uses -ize: organize, realize, recognize. British English accepts both. In the UK, -ise is the more common choice (organise, realise), but Oxford University Press uses -ize, a style called Oxford spelling, so you will see organize in British books too. Neither is wrong in the UK. Pick one and keep to it.

Two cases are settled. Words ending in -yse are always -yse in British English: analyse, paralyse, against American analyze, paralyze. And some words take -ise everywhere, because the ending isn’t the same suffix: advertise, advise, exercise, surprise, compromise and supervise.

Double l, single l

When a word ends in a single vowel and l, like travel, and takes -ed or -ing, British English doubles the l: travelled, cancelled, modelling. American English usually doesn’t: traveled, canceled, modeling. The same goes for jewellery and jewelry.

A few words go the other way. British fulfil, enrol, skilful and instalment have one l where American fulfill, enroll, skillful and installment have two.

-ce and -se

British English writes defence, offence and licence; American English writes defense, offense and license.

British English also uses the spelling to tell a noun from a verb. Practice and licence are nouns; practise and license are verbs. So you go to football practice, but you practise your accent. American English uses practice and license for both.

Other spellings to know

A computer program is spelt that way in British English too. Only a television or theatre programme keeps the longer spelling.

Everyday words that differ

The second big difference is vocabulary: everyday things that have one name in London and another in New York.

Some of these words are shared, just with a different first choice. An American knows what autumn means, and many British people say apartment for a smart flat. The table shows the word each side reaches for first.

Words that change meaning

The words above are easy: you either know them or you don’t. These are harder, because they exist on both sides and mean something different on each.

• Chips. In the UK, hot fried potato, as in fish and chips. In the US, the thin crunchy kind from a bag, which the British call crisps.
• Pants. In the UK, underwear. In the US, trousers, which is also the word to use in the UK.
• Biscuit. In the UK, something sweet you have with tea. In the US, a soft, savoury bread, a little like a scone.
• Rubber. In the UK, the thing that removes pencil marks, which Americans call an eraser.
• First floor. As at the start: one floor up in the UK, the ground floor in the US.
• Football. In the UK, the game Americans call soccer. In the US, American football.

British vs American grammar

The grammar is almost entirely shared. The differences are habits, not rules, and you can be understood either way. But they are the details that make a sentence sound British.

The team are, the team is

British English often treats a group as the people in it, and uses a plural verb: “The team are playing well”, “The government have decided”. American English treats the group as one thing: “The team is playing well”. Both are correct in British English; the singular is the usual choice in American.

Got and gotten

American English uses gotten as a past participle: “It’s gotten colder.” British English uses got: “It’s got colder.” The old form survives in Britain in phrases like ill-gotten gains.

British English also likes have got for owning something: “Have you got a pen?” An American is more likely to ask “Do you have a pen?”, which is also fine in British English.

Just, already and yet

With just, already and yet, British English prefers the present perfect: “I’ve just eaten”, “Have you finished yet?”. American English often uses the simple past: “I just ate”, “Did you finish yet?”.

Small words

• British people do things at the weekend; Americans do them on the weekend.
• A British shop is open Monday to Friday; an American one is open Monday through Friday.
• British English says different from or different to; American English says different from or different than.
• British English uses shall for offers and suggestions: “Shall I open the window?” American English more often says “Should I”.

Dates and punctuation

Two last details give a piece of writing away at a glance.

Dates. British English puts the day first: 18 October 2026, or 18/10/2026. American English puts the month first: October 18, 2026, or 10/18/2026. So 3/4 is the third of April in London and March the fourth in New York.

Punctuation. British writing often uses single quotation marks, and usually puts a full stop or comma inside them only when it belongs to the quotation. American writing uses double quotation marks and puts commas and full stops inside, always. British English usually writes Mr and Dr with no full stop, where American English writes Mr. and Dr. with one. And what the British call a full stop, Americans call a period.

How British and American English sound

Everything so far happens on the page. Out loud, the difference is the accent, and you can hear it in a single word.

In Modern RP, the standard British accent, an r is only pronounced when a vowel sound follows it. So water has no r at all, and its t stays crisp:

In sorry, the r comes back, because a vowel follows it. What changes is the vowel before it: Modern RP uses the short, rounded vowel of hot.

And some words take a long “ah” in Modern RP where American English has the short a of cat. Banana is one.

The same long “ah” is in bath, grass, after and can’t, and that difference has a name: the trap–bath split. For all eight sound differences, with how to say each one, read British vs American accent.

Spelling and vocabulary you can look up. An accent you have to hear and practise. If you want your English to sound British as well as read British, the accent to learn is Modern RP, the voice of a BBC newsreader today.

Which one should you use?

The one that fits your life. Neither is better, and neither is more correct.

If you live, work or study in the UK, or write for British readers, use British English. If your world is American, use American English. If neither applies, choose the one you like and hear most.

Then keep to it. What readers notice is a mix: colour in one line and color in the next looks like a mistake, even though each is correct somewhere. Set your spellchecker to English (UK) or English (US), and it will catch most of the slips for you.

And if you choose British English, take the accent with it. Start with Received Pronunciation, the accent most people mean by “a British accent”, then follow the steps in how to do a British accent. Sterling is your AI-powered accent coach that teaches you how to speak English with a British accent confidently and clearly. Curious where your accent stands today? Take the free accent test and find out in a minute.