British vs American English: The Main Differences in Spelling, Vocabulary and Pronunciation

British and American English are the same language with small, predictable differences in spelling, vocabulary and pronunciation, plus a few differences in grammar and in how dates are written. British English writes colour, centre and travelled; American English writes color, center and traveled. A British flat is an American apartment. Most American speakers pronounce the r in car and water, while most speakers of standard southern British English do not. Speakers of the two varieties understand each other easily, and major exams such as IELTS and Cambridge English accept either variety. This guide sets out the main differences in tables, with dictionary sources, and explains which variety to learn and how to stay consistent in an exam.

How different are they really?

Less than many learners fear. Cambridge's grammar reference puts it like this: "Most of the differences between the English of the UK (which we shall call BrE) and the English of North America (which we shall call AmE) are vocabulary differences and differences in pronunciation and spelling." It adds that almost all grammar structures are used in both varieties, that the differences are often about how common a structure is, and that "there are fewer differences in writing than in speaking."

In practice, that means:

• Spelling follows a handful of patterns you can learn in an afternoon.
• Vocabulary differs for a few hundred everyday words, mostly about food, transport, housing and clothes. A few cause real confusion.
• Pronunciation is where you will notice the difference most, but it rarely blocks understanding once you are used to both.
• Grammar differences are small and mostly about preference, not right and wrong.

Remember too that neither variety is one single accent or dialect. Scotland, Liverpool, Texas and New York all sound different. In this guide, "British" and "American" mean the standard forms you find in dictionaries and teaching materials.

Spelling differences: the main patterns

Most spelling differences follow a few regular patterns. Learn the pattern and you can spell hundreds of words correctly in either variety.

Pattern	British English	American English	Notes
-our / -or	colour, favour, neighbour, behaviour	color, favor, neighbor, behavior	Merriam-Webster labels colour "chiefly British spelling of color"
-re / -er	centre, metre, theatre	center, meter, theater	Merriam-Webster labels centre "chiefly British spelling of center"
-ise / -ize	organise or organize, realise or realize	organize, realize	Both are correct in British English. Cambridge marks organize "UK usually organise"
-yse / -yze	analyse, paralyse	analyze, paralyze	British English uses -yse only
-ence / -ense	defence, offence, licence (noun)	defense, offense, license	Merriam-Webster labels defence "chiefly British"
Double l before an ending	travelled, travelling, cancelled	traveled, traveling, canceled	Merriam-Webster: traveled is typical in the US, travelled dominant everywhere else
-ogue / -og	catalogue, dialogue	catalog, dialog (catalogue also used)	Merriam-Webster gives catalog as the main US form, with catalogue as a variant
Noun -ce / verb -se	practice (noun), practise (verb)	practice (noun and verb)	British English keeps the noun and verb spellings separate

Sources: Merriam-Webster entries for colour, centre, defence, organise, travel and catalogue; Cambridge Dictionary entry for organize; all read 9 November 2026.

A few common words have their own individual spellings rather than a pattern: British programme (a TV or radio show) and American program; British cheque (for paying) and American check; British tyre and American tire; British grey and American gray; British aluminium and American aluminum. Note that British English also uses program for computer programs.

Cambridge Grammar also notes that British English can use either -ed or -t for the past of verbs such as learn, dream, spell and spill (learned or learnt, spilled or spilt), while American English prefers -ed.

Vocabulary differences: everyday word pairs

These are the pairs you are most likely to meet when travelling, working or watching series. Most are easy to understand from context. The second table lists the ones that really do cause misunderstandings.

British English	American English	Topic
flat	apartment	Home
lift	elevator	Home
rubbish	garbage, trash	Home
lorry	truck	Transport
petrol	gas, gasoline	Transport
car park	parking lot	Transport
the underground (in London, the Tube)	subway	Transport
pavement	sidewalk	Street
queue	line	Street
postcode	zip code	Street
chips	French fries	Food
crisps	chips, potato chips	Food
biscuit	cookie	Food
trousers	pants	Clothes
holiday	vacation	Free time
film	movie	Free time
autumn	fall (autumn is also used)	Time
mobile (phone)	cell phone	Technology
CV	résumé	Work
timetable	schedule	Work and travel

False friends: same word, different meaning

These are the words worth learning first, because using the wrong one can confuse people or cause embarrassment.

Word	Meaning in British English	Meaning in American English
pants	underwear (Cambridge: "a piece of underwear covering the area between the waist and the tops of the legs")	trousers
the first floor	"the level of a building that is one level above the street"	"the level of a building that is at the same level as the street" (British: the ground floor)
chips	long, thin pieces of fried potato, eaten hot (American: French fries)	thin, crisp slices sold in bags (British: crisps)
pavement	the path at the side of a road for people to walk on (American: sidewalk)	the surface of a road

Source: Cambridge Dictionary entries for pants, the first floor, chip, pavement, flat and lorry, read 9 November 2026.

The quickest way to check any word is to look it up in the Cambridge Dictionary, which labels region-specific meanings with UK or US and often gives the other variety's word in brackets. Its entry for flat, for example, is labelled UK with "US apartment".

Pronunciation differences, with examples

Pronunciation is where the two varieties sound most different. Three features explain most of what you hear:

• The r after a vowel. Standard American English pronounces the r in words like car, water, organize and park. Standard southern British English normally does not pronounce it unless a vowel follows. Cambridge shows this difference in its IPA: organize is /ˈɔː.ɡən.aɪz/ (UK) and /ˈɔːr.ɡən.aɪz/ (US).
• The t between vowels. In American English, a t between vowels often sounds like a quick, soft d, so water sounds close to "wadder". Cambridge marks this sound as /t̬/ in its US transcriptions.
• The vowel in words like bath, can't and dance. Standard southern British English uses a long /ɑː/ in many of these words; American English uses the short /æ/ of cat.

Word	UK (Cambridge IPA)	US (Cambridge IPA)	What changes
tomato	/təˈmɑː.təʊ/	/təˈmeɪ.t̬oʊ/	The stressed vowel, the t sound and the final vowel
schedule	/ˈʃedʒ.uːl/ or /ˈʃedjuːl/	/ˈskedʒ.uːl/	"sh" at the start in the UK, "sk" in the US
vitamin	/ˈvɪt.ə.mɪn/	/ˈvɑɪ·t̬ə·mɪn/	First vowel: "vit" in the UK, "vite" in the US
advertisement	/ədˈvɜː.tɪs.mənt/	/ˌæd.vɚˈtaɪz.mənt/	Stress moves from the second syllable (UK) to the third (US)
water	/ˈwɔː.tə(r)/	/ˈwɑː.t̬ɚ/	US flapped t and pronounced r; different first vowel
bath	/bɑːθ/	/bæθ/	Long "ah" in the UK, short "a" as in cat in the US
organize / organise	/ˈɔː.ɡən.aɪz/	/ˈɔːr.ɡən.aɪz/	US pronounces the r after the first vowel

Source: Cambridge Dictionary UK and US pronunciations for each word, read 9 November 2026. Cambridge writes the final r of the UK form of water as a small raised letter; we show it in brackets. It is only pronounced when the next word begins with a vowel. The US form of vitamin is from Cambridge's American dictionary.

The Cambridge Dictionary has audio for both pronunciations of almost every word, which is the easiest way to train your ear. If you want to work on your own pronunciation, our guide on how to improve your English speaking has practical exercises.

Grammar and date formats, briefly

Grammar differences are small, and both forms are usually understood everywhere. These are the ones Cambridge's grammar reference highlights that learners meet most often:

Point	More typical in British English	More typical in American English
Past participle of get	"It's got colder."	"It's gotten colder."
Possession	"I've got two cousins."	"I have two cousins."
Already and yet	"Have you had a reply yet?" (present perfect)	"Did they pick the team yet?" (past simple is common)
Weekends	at the weekend	on the weekend
Streets	"She lives in Walton Street."	"I used to live on Perot Street."
Time ranges	Monday to Friday	Monday through Friday
Past of fit	"The sweater fitted her perfectly."	"The clothes fit." (past simple fit)

Source: Cambridge Dictionary, English Grammar Today: British and American English, read 9 November 2026. Example sentences are adapted from that page.

Dates: the one that causes real mistakes

The most practical difference is the order of day and month when dates are written in numbers. In British usage, 9/11/2026 means 9 November 2026 (day first). In American usage, the same numbers mean September 11, 2026 (month first). In words, British style is usually "9 November 2026"; the GOV.UK style guide, for example, asks for "4 June 2017" with no ordinal and no comma. American style usually puts the month first: "November 9, 2026". For any document going to another country, write the month as a word to avoid confusion.

Which one should you learn?

There is no "better" English. Cambridge English says it directly: "There's no right or wrong type of English." The practical answer depends on your goals:

• Choose the variety of the place you will live, study or work. Moving to the UK, Ireland or Australia? British spelling will look natural to colleagues there. Working for a US company? American spelling will fit in.
• If you have no specific destination, follow your materials. If your coursebook, teacher and dictionary use British English, staying with British English is simpler than switching.
• Understand both, produce one. You will hear both in films, podcasts, meetings and exams, so train your ear for both. For your own writing, pick one variety and use it consistently.
• Do not try to change your accent to match one variety perfectly. Clear pronunciation, good word stress and natural intonation matter far more than whether you sound British or American.

Not sure what level you are at? Our free English level test describes each CEFR level in can-do terms, and our courses and free lessons can help you build both accuracy and listening range.

British or American English in IELTS and Cambridge exams

Both IELTS and Cambridge English Qualifications accept British and American English. The detail matters, because the two organisations phrase the consistency rule slightly differently.

Exam	What the official source says	What it means for you
IELTS	"Both British English (e.g., colour, organise, centre) and American English (e.g., color, organize, center) are 100% accepted and scored equally in Listening, Reading, and Writing. The golden rule is consistency within your writing tasks." The Listening test includes a mix of accents, and in Speaking "you are free to speak in any standard English accent".	Choose one spelling system and keep it through each Writing task. Expect to hear British, Australian, American, Canadian and New Zealand accents in Listening.
Cambridge English Qualifications	"In Cambridge English Writing tests, British or American spelling can be used. They can also be used together … However, once your child spells a word one way, they must continue to spell the word that way for the rest of the test." Listening tests "include a variety of accents", and in Speaking tests "learners don't need to have an English accent".	Cambridge allows a mix of varieties across different words, but each individual word must be spelt the same way throughout. Using one variety for everything is the simplest way to meet that rule.

Sources: British Council, British or American English in the IELTS test?; Cambridge English, Should my child learn American or British English?; both read 9 November 2026.

How to stay consistent on test day

1. Decide before you start studying for the exam, and use that variety in every practice essay.
2. Set your word processor to the same variety (English UK or English US) when you practise, so the spellchecker trains you instead of confusing you.
3. Make a short personal list of your "danger words", the ones you tend to switch: colour/color, organise/organize, travelled/traveled, programme/program.
4. In IELTS Listening, copy the spelling you know. Either variety is accepted, so do not waste time worrying about which one the speaker would use. Spell the word correctly in one system.
5. Check your final paragraph. Inconsistency usually appears at the end, when you are writing quickly.

If you are preparing for IELTS, our IELTS score calculator shows how section scores turn into an overall band. If you need IELTS for a UK visa, our guide to the UK visa B2 English requirement explains which test version you need.

What this article cannot tell you

• Every difference. There are many more vocabulary and spelling differences than we can list here. When in doubt, check a word in a dictionary that labels UK and US usage.
• Regional and personal variation. "British" and "American" each include many accents and dialects. The pronunciations shown are dictionary standards, not how every speaker talks.
• Other varieties. Australian, Canadian, Irish, Indian, South African and other Englishes have their own conventions, often mixing British and American forms.
• Future exam rules. The IELTS and Cambridge statements were checked on 9 November 2026. Test providers can update their guidance, so read the current official page before your exam. We have not covered other tests here.
• Style rules at your workplace or university. Many organisations have their own style guide that sets the variety you must use. Follow it where it applies.

This page is independent guidance from Oxford English Global. It contains no affiliate links, and we receive nothing from any dictionary publisher or exam board mentioned.