British vs American English: Spelling, Vocabulary, and Grammar

Overview: Two Varieties, One Language

British English (BrE) and American English (AmE) are the two most influential varieties of the English language. Despite their differences, they are mutually intelligible—speakers of each variety can understand the other without difficulty in the vast majority of situations. The differences, while numerous, are mostly superficial: spelling conventions, vocabulary choices, occasional grammar preferences, and pronunciation patterns.

These two varieties have diverged over roughly four centuries since English settlers first arrived in North America. The history of the English language shows that American English is not a corruption of British English but rather a parallel evolution—and in some cases, American English preserves older forms that British English has since abandoned.

Understanding these differences is important for anyone writing for an international audience, studying for language exams, or simply curious about the richness of English. This guide covers all the major differences with comprehensive tables and examples.

Spelling Differences

Spelling is the most visible difference between British and American English. Many of these differences can be traced to Noah Webster, whose American dictionary (published in 1828) deliberately simplified certain British spellings.

-our vs. -or

-ise vs. -ize

Note: Many British style guides (including Oxford) actually prefer -ize, making this less clear-cut than other differences.

-re vs. -er

-ence vs. -ense

Doubled Consonants

British English doubles the final consonant before a suffix when the consonant follows a vowel, even in unstressed syllables. American English only doubles in stressed syllables:

Other Spelling Differences

Vocabulary Differences

Vocabulary differences between British and American English are extensive. Many common everyday items have different names:

Transportation

Food and Drink

Everyday Life

Grammar Differences

Collective Nouns

British English often treats collective nouns as plural; American English treats them as singular:

• BrE: The team are playing well.
• AmE: The team is playing well.

Present Perfect vs. Simple Past

British English uses the present perfect for recent events more often than American English:

• BrE: I have just eaten lunch.
• AmE: I just ate lunch.

Got vs. Gotten

• BrE: She has got a new car. / Things have got worse.
• AmE: She has gotten a new car. / Things have gotten worse.

Shall vs. Will

British English uses "shall" for first-person future and offers; American English almost exclusively uses "will."

The Subjunctive Mood

American English preserves the mandative subjunctive; British English often uses "should" instead:

• AmE: I suggest that he be promoted.
• BrE: I suggest that he should be promoted.

Prepositions

Punctuation Differences

While most punctuation rules are the same, a few notable differences exist:

Quotation Marks

• BrE: Single quotes for primary quotations ('like this'), double for quotes within quotes.
• AmE: Double quotes for primary quotations ("like this"), single for quotes within quotes.

Periods in Abbreviations

• BrE: Mr, Mrs, Dr (no period when abbreviation ends with last letter of the word)
• AmE: Mr., Mrs., Dr. (period after all abbreviated titles)

Comma Before "And" in Lists (Oxford Comma)

• BrE: More variable; many publications omit it.
• AmE: More commonly used, especially in formal writing.

Pronunciation Differences

Pronunciation differences between BrE and AmE are extensive, but here are the most notable patterns:

• Rhoticity: Most American accents are rhotic (the "r" in "car" is pronounced). Standard British English (RP) is non-rhotic (the "r" is silent in "car").
• The "a" in "bath": BrE uses a long /ɑː/ (like "father"); AmE uses a short /æ/ (like "cat").
• The "t" in "water": AmE often "flaps" the t to sound like a d; BrE keeps a clearer t sound.
• Stress patterns: Some words are stressed differently: ADvertisement (BrE) vs. adVERtisement (AmE).

For more on pronunciation, see our guides to Received Pronunciation and the General American accent.

Date and Number Formats

Historical Background

Many of the differences between British and American English arose during the 18th and 19th centuries. Noah Webster, the American lexicographer, deliberately reformed American spellings to distinguish the new nation's language from British English. He simplified "-our" to "-or," "-re" to "-er," and made other systematic changes that became standard in American dictionaries.

Interestingly, some "American" forms are actually older. The word "gotten" (common in AmE, rare in BrE) was standard in British English for centuries before falling out of use in Britain. Similarly, "fall" for the season was common in England before "autumn" (borrowed from French) replaced it—but American English retained "fall."

Which Should You Use?

The choice between British and American English depends on your audience:

• Academic context: Match the variety used by your institution or publication.
• Business: Match your audience's location, or default to the variety your organization uses.
• International audience: Either variety is fine, but be consistent. Don't mix British and American spellings in the same document.
• Language exams: IELTS accepts both varieties (but be consistent); TOEFL leans toward American English.

The most important rule: be consistent. Don't write "colour" in one paragraph and "color" in the next.

Other English Varieties

British and American English are just two of many English dialects and varieties spoken worldwide. Other major varieties include:

• Australian English
• Canadian English
• South African English
• Indian English
• Singapore English
• Irish English

Each has its own distinctive vocabulary, grammar features, and pronunciation patterns, making English one of the most diverse languages in the world.

Summary and Key Takeaways

• Spelling: The most visible differences (-our/-or, -ise/-ize, -re/-er).
• Vocabulary: Many everyday items have different names (lift/elevator, boot/trunk).
• Grammar: Collective noun agreement, present perfect usage, and subjunctive form differ.
• Punctuation: Quotation mark styles and abbreviation periods differ.
• Pronunciation: Rhoticity, vowel quality, and stress patterns are the main differences.
• Consistency is more important than which variety you choose.