The main differences between American and British English are spelling (color vs. colour), vocabulary (apartment vs. flat), a few grammar habits (the team is vs. the team are), quotation-mark punctuation, and date formats. Neither variety is more correct. The real rule is to pick one and use it consistently.
American and British English are the same language with different house rules. A reader in Chicago and a reader in London will both understand “colour,” “lift,” and “at the weekend,” but each will notice when you’ve switched teams.
This guide uses American English as the home base, since that’s what GrammarVista.com USA teaches. You’ll find spelling patterns first (the biggest source of inconsistency), then vocabulary, grammar, punctuation, and dates, plus the settings that keep your spell-checker on your side.
Key Takeaways
- Six spelling patterns cover most differences: -or, -er, -ize, -yze, -ense, and -og in American English.
- American English treats collective nouns as singular and uses gotten as a standard past participle.
- American style uses double quotation marks and always puts periods and commas inside them.
- Americans write dates month first: October 16, 2026, or 10/16/2026.
- Mixing varieties in one document looks careless; set your spell-checker to English (United States).
Spelling Patterns: The Big Six
Most American spellings come from a few predictable patterns. Learn the pattern and you’ve learned hundreds of words.
| Pattern | American | British |
|---|---|---|
| -or / -our | color, honor, favorite, neighbor | colour, honour, favourite, neighbour |
| -er / -re | center, theater, meter, fiber | centre, theatre, metre, fibre |
| -ize / -ise | organize, realize, apologize | organise, realise, apologise (or -ize) |
| -yze / -yse | analyze, paralyze | analyse, paralyse |
| -ense / -ence | defense, offense, license | defence, offence, licence (noun) |
| -og / -ogue | catalog, analog | catalogue, analogue |
Notes on the patterns
- -ize vs. -ise: American English uses -ize. British English accepts both, and Oxford University Press famously prefers -ize. Some words end in -ise everywhere: advertise, exercise, surprise, compromise, supervise.
- -er vs. -re: A few words keep -re in American English too: acre, massacre, mediocre, ogre. You’ll also see “Theatre” in the names of some US venues; that’s branding, not standard spelling.
- -ense vs. -ence: In British English, licence and practice are nouns, while license and practise are verbs. American English uses license and practice for both.
- -og vs. -ogue: Americans write catalog and analog, but dialogue is still the usual American spelling for conversation. Dialog shows up mainly in software (“dialog box”).
Quick rule: If a word ends in -our, -re, or -ise and you’re writing for Americans, check whether it has a shorter US form.
Doubled Letters and One-Off Spellings
The doubled L
When adding -ed, -ing, or -er to a verb ending in l, British English doubles the l even when the stress isn’t on the last syllable. American English usually doesn’t.
| American | British |
|---|---|
| traveled, traveling, traveler | travelled, travelling, traveller |
| canceled, canceling | cancelled, cancelling |
| labeled, modeling | labelled, modelling |
| jewelry | jewellery |
But watch the reversal: American English often uses two l’s where British uses one. Americans write enroll, fulfill, skillful, installment; Brits write enrol, fulfil, skilful, instalment.
You’ll still see cancellation (double l) in American English, even though canceled has one. Merriam-Webster lists both canceled and cancelled; canceled is the more common US form.
Words to memorize
| American | British |
|---|---|
| gray | grey |
| check (bank) | cheque |
| tire (on a car) | tyre |
| aluminum | aluminium |
| program | programme (but program for computer code) |
| curb | kerb |
| plow | plough |
| mold | mould |
| pajamas | pyjamas |
| airplane | aeroplane |
| mom | mum |
Memory trick: Gray is American; grey is English.
Spelling pairs aren’t the only words that trip writers up. Our guide to commonly confused words covers look-alikes such as affect and effect.
Vocabulary: Same Thing, Different Word
Spelling differences rarely cause confusion. Vocabulary differences can, especially when the same word means different things.
| American | British |
|---|---|
| apartment | flat |
| elevator | lift |
| fall | autumn |
| cookie | biscuit |
| truck | lorry |
| sidewalk | pavement |
| vacation | holiday |
| line (of people) | queue |
| gas / gasoline | petrol |
| trunk (of a car) | boot |
| hood (of a car) | bonnet |
| French fries | chips |
| chips | crisps |
| cell phone | mobile phone |
| zip code | postcode |
| parking lot | car park |
| restroom / bathroom | toilet / loo |
| trash / garbage | rubbish |
| résumé | CV |
| eraser | rubber |
False friends
These words exist in both varieties but don’t mean the same thing:
- Pants: In the US, trousers. In the UK, underwear.
- First floor: In the US, the floor at street level. In the UK, that’s the ground floor, and the first floor is one level up.
- Biscuit: In the US, a soft, bread-like side dish. In the UK, a cookie or cracker.
- Holiday: Americans use it for specific days (Thanksgiving, July 4) and vacation for time off. Brits use holiday for both.
Informal vocabulary differs too. American texting shorthand has its own set of abbreviations, collected in our guide to text slang meanings.
Grammar Differences
The grammar gap is smaller than the vocabulary gap, but a few patterns stand out.
Collective nouns
American English treats most collective nouns as singular. British English often treats them as plural when the focus is on the members.
- American: The team is playing well. The government has announced a plan.
- British: The team are playing well. The government have announced a plan.
Band and company names follow the same pattern: an American writes “Apple is releasing,” while a Brit may write “Apple are releasing.” Our Grammar Rules section covers subject-verb agreement in more depth.
Got vs. gotten
American English uses gotten as a past participle of get when it means “obtained” or “become.” It uses got for possession (have got).
- American: She’s gotten much better at chess. (improved)
- American: I’ve got two tickets. (I have two tickets.)
- British: She’s got much better at chess.
Present perfect
British English tends to use the present perfect for recent actions with just, already, and yet. American English accepts the present perfect, but the simple past is common and fully standard, especially in speech.
- British: I’ve just eaten. Have you finished yet?
- American: I just ate. Did you finish yet? (Both forms are correct in the US.)
Prepositions
| American | British |
|---|---|
| on the weekend | at the weekend |
| Monday through Friday | Monday to Friday |
| different from / different than | different from / different to |
| in the hospital | in hospital |
| write me / write to me | write to me |
| protest the decision | protest against the decision |
Different from is safe everywhere. Different than is common and accepted in American English, especially before a clause (The city is different than I remember). Different to reads as British.
Shall
In American English, shall is mostly limited to legal and formal documents (The tenant shall pay rent monthly) and polite suggestions (Shall we go?). For the future tense, Americans use will.
Punctuation Differences
Quotation marks
This is the punctuation difference American readers notice most.
- American: Use double quotation marks, with single marks for a quote inside a quote. Periods and commas always go inside the closing quotation mark.
- British: Single quotation marks are common, and punctuation usually goes inside only if it belongs to the quoted material.
American: She called the plan “ambitious,” but she said it would “probably work.”
British: She called the plan ‘ambitious’, but she said it would ‘probably work’.
In American style, colons and semicolons go outside the quotation marks. Question marks and exclamation points go inside only if they belong to the quote: He asked, “Are you ready?” but Did she really say “no”?
Abbreviated titles
American English puts a period after Mr., Mrs., Ms., and Dr. British English usually drops the period when the abbreviation ends with the word’s last letter: Mr Smith, Dr Patel.
The serial comma
The serial (Oxford) comma is the comma before and in a list of three or more: red, white, and blue. The Chicago Manual of Style recommends it, and it’s common in American books and academic writing. AP style, used by most US newsrooms, omits it unless needed for clarity. British usage is mixed but generally leaves it out.
Read more in our post on the Oxford comma and our full guide to American punctuation rules.
Dates, Times, and Numbers
Dates
| Format | American | British |
|---|---|---|
| Written out | October 16, 2026 | 16 October 2026 |
| Numeric | 10/16/2026 (MM/DD/YYYY) | 16/10/2026 (DD/MM/YYYY) |
| Spoken | “October sixteenth” | “the sixteenth of October” |
In American running text, put a comma after the year when the date falls mid-sentence: On October 16, 2026, the office will close early. Our step-by-step guide on how to write dates in American English covers ordinals, decades, and numeric formats in detail.
Quick rule: For international readers, spell out the month. “03/04/2026” could be March 4 or April 3; “March 4, 2026” can’t be misread.
Times
Americans usually use the 12-hour clock with a.m. and p.m. (lowercase with periods in AP and Chicago style): The meeting starts at 9:30 a.m. The 24-hour clock (“military time”) is mostly used in the military, hospitals, and some technical fields.
British writing uses both the 12-hour and 24-hour clocks and often writes the time with a period: 9.30am.
Numbers and measurements
- “And” in numbers: Americans often say “one hundred five”; Brits say “one hundred and five.” Both are understood.
- Units: The US uses customary units (miles, pounds, Fahrenheit) in everyday life, and the National Institute of Standards and Technology’s unit conversion resources show how they map to metric. The UK uses metric for most things but still uses miles for road distances and pints for beer and milk.
- Decimals and thousands: Both use a period for decimals and a comma for thousands: $1,250.75.
How to Choose and Stay Consistent
Neither variety is “more correct.” What looks careless is mixing them in one document, like color in paragraph one and colour in paragraph three.
- Pick based on your audience. Writing for US customers, schools, or employers? Use American English. Publishing in the UK? Use British.
- Follow your organization’s style guide. If your company uses AP or Chicago, you’re using American conventions.
- Don’t “correct” quotations or proper nouns. Keep Royal Opera House and Pearl Harbor as they’re officially spelled.
- Watch the sneaky ones. Spelling is easy to catch. Quotation punctuation, collective nouns, and dates are where mixed styles slip through.
- Keep word choice consistent too. Don’t write apartment and flat in the same piece.
Setting Your Spell-Checker to American English
Your spell-checker can only help if it knows which variety you’re using.
Microsoft Word
- Select all text (Ctrl+A on Windows, Cmd+A on Mac).
- Go to Review > Language > Set Proofing Language (on some versions: Language > Language Preferences).
- Choose English (United States).
- To make it the default for new documents, click Set As Default.
Google Docs
- Go to File > Language.
- Choose English (United States).
Spelling suggestions in Google Docs follow the document language, so set it once per document. If you paste text from a British source into Word, re-check the language setting for the pasted section, since pasted text can bring its own language tag.
Quick Checklist
Before you publish for a US audience, run through this GrammarVista.com USA checklist:
- Spelling: -or, -er, -ize, -yze, -ense, single l in traveled.
- One-offs: gray, check, tire, aluminum, program.
- Vocabulary: apartment, elevator, fall, vacation, sidewalk.
- Grammar: Singular collective nouns (the team is), gotten, on the weekend.
- Quotes: Double quotation marks; periods and commas inside.
- Titles: Mr., Mrs., Dr. with periods.
- Dates: October 16, 2026, with a comma after the year mid-sentence.
- Settings: Document language set to English (United States).
- Consistency: One variety per document, start to finish.
The Bottom Line
American and British English differ in predictable ways, and most of those differences fit into a few patterns you can learn in an afternoon. The harder part is consistency: one variety, one style guide, one set of spellings per document.
For more side-by-side comparisons, explore the US vs UK English section or browse GrammarVista.com USA’s guides to everyday American English.
Frequently Asked Questions
Is British English more correct than American English?
No. Both are standard, fully correct varieties of English, each with its own dictionaries and style guides. Neither is a corrupted version of the other. The right choice depends on your audience and your organization’s style guide, not on which variety is older. What readers notice is inconsistency, so pick one and stick with it.
Is “-ize” American and “-ise” British?
Mostly, but not strictly. American English uses -ize, while British English accepts both, and some British publishers, including Oxford University Press, prefer -ize. Words like advertise, exercise, and surprise end in -ise in both varieties, so a blanket find-and-replace from -ise to -ize can introduce errors rather than fix them.
Which English should I use for an international audience?
Pick the variety your organization or main readers use and apply it consistently. Many global companies default to American English, but consistency matters more than the choice itself. For dates, spell out the month so readers in either system can’t misread them, and avoid slang or idioms that only one audience will recognize.
Is “gotten” a real word?
Yes. Gotten is standard in American English as a past participle of get, as in “She has gotten better.” It means obtained or become. British English generally uses got instead, though gotten survives in a few British phrases such as “ill-gotten gains.” Americans still use have got for possession, as in “I’ve got two tickets.”