Capital Letters in English: The Rules Learners Actually Need

You can spell every word in a sentence correctly and still get it marked wrong, because of one small letter at the start of a word. "i went to london on monday" has no spelling mistakes in the usual sense. It has five capital letter mistakes, and to an English reader it looks careless, rushed, or like a text message from a teenager.

Capital letters are one of the first things English readers notice and one of the last things learners are taught properly. If your first language has no capital letters at all, as is true of Arabic, Chinese, Japanese, Korean, Hindi, Hebrew and many others, the whole idea may feel strange. If your first language does have them, its rules are probably different from English in a few important places, and those differences are exactly where the mistakes happen.

This guide gives you the rules that cover nearly every case you will meet, shows where English differs from other languages, and points out the small traps that catch even advanced writers.

Why capitals catch learners out

Learners usually make capital letter mistakes for one of two reasons.

The first is that their first language does not use them. Arabic, Hebrew, Hindi, Bengali, Thai, Chinese, Japanese and Korean, among many others, have no difference between capital and small letters. For speakers of these languages, capitals are an extra rule to remember on top of spelling, and in fast writing they are often the first thing to slip. The pronoun "i", names of cities and days of the week are the usual victims.

The second reason is that their first language has capitals but uses them differently. Spanish, French, Portuguese, Italian and Russian write the days of the week, the months and the names of languages with a small letter: Spanish "lunes", "enero", "español"; French "lundi", "janvier", "français". English capitalizes all three. German goes in the opposite direction and capitalizes every noun, so German speakers sometimes write "the Book" or "a Meeting". Each language gives you a slightly different set of habits to unlearn.

Knowing which group you are in tells you where to look. If your language has no capitals, check every sentence start, every "I" and every name. If your language has different rules, check days, months, languages and nationalities first.

The two rules that cover most capitals

Two rules account for a large share of the capital letters in ordinary English writing.

Capitalize the first word of every sentence. This includes sentences that begin after a question mark or an exclamation mark, and the first word of a quotation that is a full sentence: She said, "We start at nine."

Always write the pronoun "I" as a capital. This is true wherever it appears in the sentence and in its short forms: I'm, I've, I'll, I'd. English is unusual here. Most languages with capitals write their word for "I" with a small letter, so even German, French and Spanish speakers sometimes forget it. A small "i" is one of the mistakes English readers notice most quickly.

If you fix only these two rules, your writing will already look much more careful.

Names of people, places and organizations

The third big rule is that names, which grammarians call proper nouns, start with a capital letter. A proper noun names one particular person, place or thing, while a common noun names any member of a group.

So "city" is common, but "Chicago" is a name. "River" is common, but "the Nile" is a name. "Company" is common, but "Microsoft" is a name. When a common word becomes part of a name, it takes a capital too: "a river" but "the Mississippi River"; "a university" but "Harvard University"; "a street" but "Oxford Street".

The same applies to names of countries, states, cities, mountains, buildings, companies, schools, organizations, brands, ships and planets other than our own: Brazil, Texas, Mount Everest, the Eiffel Tower, the United Nations. Note that small words inside a name, such as "of", "the" and "and", usually stay small: the United States of America, the Bank of England.

Brand names follow the company's own choice. Some companies write their names with a capital in the middle or with no capital at all. In those cases, copy the company.

Days, months and holidays, but not seasons

In English, the days of the week and the months of the year always take capitals: Monday, Tuesday, January, February. So do the names of holidays and religious festivals: Christmas, Easter, Ramadan, Eid al-Fitr, Diwali, Hanukkah, Lunar New Year, Thanksgiving.

The seasons do not. Write "spring", "summer", "fall" or "autumn", and "winter" with small letters, unless the word starts a sentence or is part of a name, such as "the Winter Olympics".

This is one of the most common mistakes for speakers of Spanish, French, Portuguese, Italian and Russian, because their languages write days and months with small letters. If that is you, it is worth checking every date you write in English. For more on writing dates, numbers and addresses correctly, see how to spell numbers, dates and addresses.

Languages, nationalities and religions

English capitalizes the names of languages, nationalities and peoples, and the words made from them: English, Spanish, Arabic, Chinese; a Brazilian student, Japanese food, the French government, an Indian restaurant. Religions and their followers take capitals too: Islam, Christianity, Hinduism, Judaism, Buddhism; Muslim, Christian, Hindu, Jewish, Buddhist.

This leads to a useful pattern with school subjects. Language subjects are always capitalized, because they are names of languages: "I teach English and French". Other subjects are not, unless they are part of the name of a specific course: "she studies math and biology", but "she is taking Biology 101".

For speakers of Spanish, French and Russian, this is the second big trap after days and months. "I speak english" looks wrong to an English reader, even though "español" and "français" are correct in their own languages.

Titles and family words

A title before a name takes a capital: Doctor Patel, Professor Kim, President Lincoln, Aunt Maria. The same word used on its own, as a description, usually does not: "the doctor will see you now", "she is a professor", "the president spoke today". Style guides differ on some details here, especially for very senior offices, but this basic pattern is safe.

Family words follow a similar rule. When "mom", "dad", "grandma" or "uncle" is used as a name, it takes a capital: "Can you help me, Mom?" When it follows a word like "my" or "her", it is a description and stays small: "my mom is a nurse."

Job titles in a resume, an email signature or a business card are usually capitalized, as in "Senior Accountant" or "Head of Marketing", because they function as formal labels. In ordinary sentences, the same words are often small: "she works as an accountant".

Titles of books, films and headings

For titles of books, films, songs, articles and reports, English usually uses title case: you capitalize the first word, the last word and all the important words, and leave short words like "a", "the", "of", "in" and "and" small. "The Lord of the Rings", "Pride and Prejudice", "A Guide to English Spelling".

The exact rules differ between style guides. The Chicago Manual of Style, the Associated Press and the American Psychological Association each have slightly different lists of small words, and each publisher picks one. Many websites, including newspapers, now use sentence case for headlines, where only the first word and names are capitalized: "A guide to English spelling for learners". If you are writing for a school or an employer, follow their guide. If there is no guide, choose one style and use it consistently.

Here is a summary of the patterns in this guide, with the most common learner mistake for each.

Small traps that catch advanced writers

A few cases cause trouble even for people who know the main rules.

After a colon, American style usually keeps a small letter if what follows is not a full sentence, and style guides differ when it is. In British English, a small letter after a colon is usual. Points of the compass are small when they describe a direction, "drive north for ten miles", and capitalized when they name a region, "she grew up in the South".

Some words have changed over time. The Associated Press stylebook switched to a lowercase "internet" in 2016, and many writers and publishers have followed. Older texts you read may still write "the Internet". Both are understandable, but current usage favors the small letter.

Abbreviations made from the first letters of several words are usually written all in capitals: UN, USA, CEO, HR, NASA. This stays true in the middle of a sentence: "she works in HR", "a USB cable". A few common abbreviations have become ordinary words and lost their capitals, such as "laser" and "scuba", which began as abbreviations but are now written like any other noun. When you write the full form of an abbreviation that is a name, keep the capitals: the United Nations, the Chief Executive Officer of a named company. When the full form is just a description, it goes back to small letters: "every company needs a chief executive".

Finally, avoid writing whole words or sentences in capitals in emails and messages. In English online writing, all capitals are read as shouting. If you need emphasis, use bold or rewrite the sentence. And do not capitalize ordinary nouns because they feel important, such as "our Company" or "the Project". In English, importance does not earn a capital; only names do.

What to do next

Take a page of your own recent English writing and check it only for capitals, ignoring everything else. Look first at your weakest group: sentence starts and "I" if your language has no capitals, or days, months, languages and nationalities if it uses them differently. Mark every mistake and note which rule it breaks.

Most learners find that one or two rules cause nearly all their capital letter errors, and these are easy to fix once you know which ones they are. Capitals are only one part of writing correctly, of course. For the spelling of the words themselves, see the complete guide to English spelling for ESL learners, and if your errors come from your first language, why English spelling is so hard for non-native speakers explains the patterns behind them.

Questions people ask

Do days of the week and months need capital letters in English?

Yes. In English, the days of the week and the months of the year always start with a capital letter, as in Monday and January. This is different from Spanish, French, Portuguese, Italian and Russian, which write them with small letters. The seasons, such as spring and winter, are not capitalized in English.

Why is the word I always capitalized in English?

In English, the pronoun "I" is always written as a capital letter, wherever it appears in a sentence and in short forms like I'm and I'll. The habit became fixed in written English several hundred years ago, and most other European languages do not share it. Writing a small "i" is one of the capital letter mistakes English readers notice most quickly.

Do you capitalize languages and nationalities in English?

Yes. Names of languages and nationalities always start with a capital letter in English, as in English, Arabic, Spanish, Chinese food and a Brazilian student. Religions and their followers are capitalized too, such as Islam, Muslim, Christianity and Christian. Many other languages use small letters for these words, so learners often need to check them.

Should job titles be capitalized in English?

A job title is capitalized when it comes directly before a name, as in Doctor Patel or President Lincoln, and when it is used as a formal label in a resume or email signature. When it is used as an ordinary description in a sentence, it is usually small, as in "she works as an accountant". Style guides differ on some details, so follow your employer's guide if there is one.

Is it internet or Internet?

Both appear in writing, but current style favors a small letter. The Associated Press stylebook changed to "internet" in 2016, and many publishers and writers now follow that choice. Older texts often use the capitalized form.

What is the difference between title case and sentence case?

In title case, the first word, the last word and all important words of a title are capitalized, while short words such as "a", "of" and "the" stay small, as in "Pride and Prejudice". In sentence case, only the first word and any names are capitalized, as in an ordinary sentence. Book titles usually use title case, and many websites and newspapers now use sentence case for headlines.

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