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Choosing 'a' or 'an' depends on sound, not spelling. Below are clear rules, quick memory tricks, many corrected sentences you can copy, and reusable rewrites for work, school, and casual writing.

Quick answer

Use 'an' before words that begin with a vowel sound and 'a' before words that begin with a consonant sound. Pronounce the next word in your head - that sound decides the article.

Sound matters, not the first letter: a university (yoo- sound) vs. an hour (silent h).
Acronyms follow how you say them: an FBI agent (eff-B-I) but a URL (you-are-ell).
When unsure, reword (use the, expand the acronym, or restructure the sentence).

Core explanation: sound over spelling

Ask: what is the first sound of the next word? If it starts with a vowel sound (a, e, i, o, u vowel sounds), use 'an'. If it starts with a consonant sound (including y or w sounds), use 'a'.

Say the word aloud or read it the way you would speak it. That will reveal the correct article.

Vowel-sound examples: an apple, an hour, an M.A.
Consonant-sound examples: a banana, a university, a U-turn (you-turn).

Memory tricks that work under pressure

Say the next word by itself. If it begins with a vowel sound → use 'an'. If not → use 'a'.
For letters and initialisms, say the letter name: if the name starts with a vowel sound (F = "eff") use 'an'; if it starts with a consonant sound (U = "you") use 'a'.
If still unsure, replace the article with 'the' or rephrase to avoid ambiguity.

Think "an M" (em) but "a Y" (why).
Treat uni- words like consonants: a university, a unique idea (yoo- sound).
Silent h → an honest mistake; pronounced h → a helpful tip.

H and other silent letters

If the initial h is silent, use 'an' (an hour, an heir). If the h is pronounced, use 'a' (a hotel, a historical record).

Pronunciation varies by dialect. Choose the form your readers expect or rewrite to avoid the choice.

Silent h: an hour, an honest opinion.
Pronounced h: a hotel, a helpful comment.
Older or regional usage may prefer an historic; modern American usage often uses a historic.

Acronyms, letters, and initialisms - decide by pronunciation

Read the abbreviation aloud. If you say separate letter names and the first letter-name starts with a vowel sound, use 'an' (an F, an FBI). If the first letter-name starts with a consonant sound, use 'a' (a URL).

If the acronym is pronounced as a word (NASA), treat it like any regular word: a NASA project.

an FBI agent (F = eff)
an MRI scan (M = em)
a URL link (U = you)
a NASA engineer (NASA pronounced as a word)

Try your own sentence

Test the whole sentence, not just the phrase. Context often clarifies the natural pronunciation and choice.

Real usage: copy-ready sentences for work, school, and casual messages

Pick a sentence that matches your context and tweak the noun as needed.

Work: Please review an attached spreadsheet with the Q2 figures.
Work: We need a user guide before the rollout.
Work: She is an HR specialist leading the hiring round.
School: Write an essay comparing two primary sources.
School: He is a university student in the economics program.
School: Turn in an 11-page draft by Tuesday.
Casual: I'll be there in an hour - running late.
Casual: Got a one-day pass to the event.
Casual: That's an unusual idea - tell me more.

Wrong → Right pairs (fast scan to fix sentences)

Wrong: I have a apple.
Right: I have an apple.
Wrong: She's a honest person.
Right: She's an honest person.
Wrong: I scheduled a MRI for next week.
Right: I scheduled an MRI for next week.
Wrong: He got an university scholarship.
Right: He got a university scholarship.
Wrong: We booked an hotel downtown.
Right: We booked a hotel downtown.
Wrong: Send a URL to the team.
Right: Send a URL to the team. (pronounce "you" → a URL)

Fix your sentence: diagnostic steps and reusable rewrites

Say the next word aloud and listen to its first sound.
Choose 'an' for vowel sounds and 'a' for consonant sounds.
If uncertain, rephrase: use 'the', expand the acronym, or restructure the clause.

Reusable rewrite templates:

Template: Replace a/an + noun with the + noun when the noun is specific. Example: "a report" → "the report."
Template: Expand the abbreviation. Example: "an FBI agent" → "an agent from the FBI."
Template: Use a clause or gerund to avoid the article. Example: "a rare problem" → "this rare problem" or "experiencing rare problems."

Hyphenation, spacing, and small grammar traps

The article follows the first spoken element of a hyphenated phrase. Always use one space between the article and the noun.

Hyphenated: a one-off opportunity (one = "w" sound → a); an X-ray (X = "eks" → an).
Numbers: an 18-wheeler (eighteen begins with a vowel sound); a 1-hour task (one begins with a consonant-like w sound → a).
Spacing: use a single space after the article: "a word", "an item".
While fixing articles, scan for related errors: your/you're and their/there/they're - they often occur together.

Correct: an X-ray image.
Correct: a one-time exception.

FAQ

When do I use 'a' vs 'an' before words starting with h?

Use 'an' when the h is silent (an hour, an heir). Use 'a' when the h is pronounced (a hotel, a historic meeting). Follow the pronunciation your audience expects and be consistent within a document.

Is it 'a university' or 'an university'?

It's a university because university begins with a consonant yoo sound. The rule depends on sound, not the letter 'u'.

Should I write 'an historic' or 'a historic'?

Most modern American usage prefers a historic because the h is pronounced. 'An historic' appears in older or some British styles. Choose one and remain consistent.

How do I handle acronyms like 'FBI' or 'MBA'?

Decide by how you say them: F = "eff" → an FBI agent. M = "em" → an MBA. U = "you" → a URL. If the acronym is spoken as a word (NASA), treat it like a regular word: a NASA mission.

What's the fastest way to check an article in a sentence?

Say the word after the article out loud and listen to its first sound. If unsure, rephrase to eliminate the choice (use 'the', expand the acronym, or restructure the sentence).

Need a quick check?

Read the sentence aloud, run the three-step diagnostic from the Rewrite Help section, or paste the sentence into a grammar checker. Keep a short list of tricky words (honest, hour, university, unique) and a couple of rewrite templates to speed up edits under pressure.