Do You Capitalize This In A Title

Capitalization rules for titles can feel like navigating a minefield. The confusion stems from the fact that there is no single, universal law governing title case; instead, major style guides—AP, Chicago, MLA, and APA—each have their own distinct preferences. Even so, one moment you are confidently capitalizing every word, and the next you are second-guessing whether in, the, or with deserves that uppercase letter. Understanding these nuances is essential for students, professional writers, marketers, and anyone publishing content online. This guide breaks down exactly how to handle capitalization in titles, covering the core rules, the major style guide differences, and the specific words that cause the most hesitation.

The Fundamental Principle: Title Case vs. Sentence Case

Before diving into specific words, you must determine which capitalization style your project requires. The two dominant standards are Title Case (often called Headline Style) and Sentence Case.

Title Case is the standard for book titles, article headlines, blog posts, movie titles, and academic papers in many disciplines. In this style, you capitalize the first and last words of the title, along with all "major" words in between. Major words typically include nouns, pronouns, verbs, adjectives, adverbs, and some conjunctions Nothing fancy..

Sentence Case is simpler: you capitalize only the first word of the title, the first word after a colon (subtitle), and any proper nouns. This style is standard in APA reference lists, many scientific journals, and newspaper sub-headlines.

If you are writing a blog post headline or a book title, you almost certainly need Title Case. If you are formatting a reference list for a psychology paper, you likely need Sentence Case.

The Core Rules of Title Case (What to Always Capitalize)

Regardless of which style guide you follow (AP, Chicago, MLA), the following categories of words are always capitalized in Title Case:

1. The First and Last Word: This rule is absolute. Even if the last word is a, the, or in, it gets capitalized.
   • Example: "The End of An Era"
2. Nouns: Dog, City, Happiness, Data.
3. Pronouns: He, She, It, They, We, Who, That, This.
   • Note: It is a pronoun, so it is always capitalized ("Where It Ends"). This is a common error because it is short.
4. Verbs: Run, Is, Are, Be, Has, Write.
   • Crucial Note: Is, Are, Was, Were, Be, Am are verbs (linking verbs). They are always capitalized. Do not lowercase them just because they are short.
5. Adjectives: Blue, Quick, Silent, Beautiful.
6. Adverbs: Quickly, Silently, Very, Well, Not.
   • Note: Not is an adverb. It is always capitalized ("Do Not Go Gentle").
7. Subordinating Conjunctions: Because, Although, Since, If, When, While, Until.
   • Chicago and MLA style: Capitalize these.
   • AP style: Capitalize subordinating conjunctions of four letters or more (Because, Since), but lowercase short ones (If, As)—though AP recently updated to capitalize all verbs and subordinating conjunctions regardless of length. Always check the current edition.

The "Small Words" Dilemma: What to Lowercase

The biggest source of confusion lies in short words—prepositions, articles, and coordinating conjunctions. In Title Case, these are generally lowercased (unless they are the first or last word).

1. Articles (Always Lowercase)

• a, an, the
• Example: "The Cat in the Hat"

2. Coordinating Conjunctions (Almost Always Lowercase)

The acronym FANBOYS helps remember these: For, And, Nor, But, Or, Yet, So Easy to understand, harder to ignore..

• Example: "War and Peace," "Gone with the Wind" (With is a preposition here, see below).
• Exception: Yet and So can function as adverbs. If they modify an adjective/verb ("So Ready for Summer"), they are capitalized. If they connect clauses ("Ready, so I Left"), they are conjunctions and lowercased (in Chicago/MLA).

3. Prepositions (The Gray Area)

This is where style guides diverge most sharply. The general rule is to lowercase prepositions, but the definition of "short" varies.

• Chicago Manual of Style (CMOS) & MLA: Lowercase all prepositions, regardless of length (between, throughout, underneath, across).
• AP Style: Lowercase prepositions of three letters or fewer (in, on, at, to, by, for, of, off, up, out). Capitalize prepositions of four letters or more (With, From, Into, Over, Under, Between, Through).
• APA Style (for paper titles, not references): Uses Title Case. Capitalize prepositions of four letters or more.

Common Prepositions & Their Treatment:

Example Title: "Walking Through the Valley"

• Chicago/MLA: Walking through the Valley
• AP/APA: Walking Through the Valley

Special Cases That Trip Up Writers

Hyphenated Compounds

Hyphenated words in titles follow specific logic.

• Chicago/MLA: Capitalize the first element. Capitalize subsequent elements unless they are articles, prepositions, or coordinating conjunctions. However, if the first element is a prefix that cannot stand alone (like Anti-, Pre-, Co-), the second element is capitalized.
  • Examples: "Self-Report," "Anti-Inflammatory," "Twentieth-Century," "Run-of-the-Mill" (lowercase of, the inside hyphen).
• AP: Capitalize the first element and any subsequent element that is a noun, verb, adjective, or adverb. Lowercase articles, prepositions (3 letters or fewer), and coordinating conjunctions.
  • Examples: "Self-report" (AP often lowercases second element if not a noun/verb), "Anti-inflammatory."

Phrasal Verbs and Particles

Words like in, on, up, down, out, off act as adverbs (particles) in phrasal verbs, not prepositions. They must be capitalized.

• Correct: "Log In to Your Account" (In is part of the verb Log In).
• Incorrect: "Log in to Your Account."
• Correct: "Hold On Tight."
• Correct: "The Up Side of Down."

The Word "As"

As functions as a preposition (*"

The Word “As” – A Double‑Edged Function

As is one of those versatile words that can act as a preposition, a conjunction, or even a subordinating adverb. Its case‑treatment therefore varies depending on how it functions in a title.

Key takeaway: In virtually every scenario, as stays lowercase under Chicago/MLM, AP, and APA title‑case rules. The only time you might see it capitalized is when it forms part of a hyphenated compound where the first element is a prefix that cannot stand alone (e.g., Pre‑as‑signed). Even then, most style guides recommend Pre‑as‑signed rather than Pre‑As‑signed.

Other Frequently Mis‑categorized Words