An hour is correct in standard US English. A hour is not the standard form.
The reason is simple: English chooses between a and an according to the sound that comes next, not simply the first written letter. Although hour begins with the consonant letter h, that h is silent. The word therefore begins with a vowel sound when spoken. an hour, just as we say an honest person. By contrast, we say a house because the h in house is pronounced.
Quick Answer
Use an hour, not a hour.
The correct sentence is:
“I waited an hour for the appointment.”
The rule depends on pronunciation. Use an before a vowel sound and a before a consonant sound. Since the h in hour is silent, the first sound is a vowel sound. ct?**
In standard American English, an hour is the correct form.
A hour may seem logical because hour begins with the letter h, but article choice is not based only on spelling. What matters is how the following word begins when pronounced.
Hour begins with the same opening sound heard in our. Because that is a vowel sound, it takes an.
So you would write:
“The drive takes an hour.”
Not:
“The drive takes a hour.”
The Core Grammar Rule
English has two forms of the indefinite article: a and an.
Use a before a consonant sound, as in a car, a house, and a university. Use an before a vowel sound, as in an apple, an idea, and an hour. Merriam-Webster, Cambridge, and Purdue all describe the distinction as sound-based. here is sound.
A word can begin with a consonant letter but still require an if that consonant is silent. Likewise, a word can begin with a vowel letter but require a when its first sound is consonant-like.
This is why an hour and a university are both correct.
When Each Form Is Correct
| Form or Pattern | Best Use | Why |
|---|---|---|
| an hour | Standard US English | Hour begins with a vowel sound because the h is silent |
| a hour | Not standard in ordinary US English | It incorrectly treats the written h as a pronounced consonant |
| an hourly wage | Standard | Hourly also begins with the vowel sound of hour |
| an hour-long meeting | Standard | The word immediately after the article is hour-long |
| a one-hour meeting | Standard | One begins with a consonant w sound |
The last two examples show an important detail. The article matches the first sound immediately after it.
Therefore, we say an hour-long meeting, but a one-hour meeting. Purdue’s article guidance confirms that modifiers between an article and noun can determine whether a or an is required. correct or Less Natural**
A hour is incorrect in standard edited US English because the usual pronunciation of hour does not begin with an h sound.
A common mistake is to look only at the first letter:
“Hour begins with h, so I should use a.”
That shortcut fails because a/an follows pronunciation.
Compare:
“I need an hour to finish.”
“I bought a house last year.”
Both nouns begin with h in writing, but they begin with different sounds when spoken.
Merriam-Webster notes that forms such as a hour can occur in some dialectal speech, but an is the usual form before a vowel sound and is the standard choice expected here. cture, or Emphasis Differences**
There is no useful meaning difference between an hour and a hour. The issue is grammatical correctness in standard usage.
Both a and an are forms of the indefinite article. Changing from one to the other does not make hour mean something different.
The choice simply makes the article fit the sound that follows.
For example:
“We have an hour before the store closes.”
Here, an introduces the singular countable noun hour. The form a hour does not create a different meaning; it creates a nonstandard article combination.
Real-World Examples
“I’ll call you back in an hour.”
“The meeting lasted almost an hour.”
“She lives about an hour from downtown.”
“We waited for an hour before our table was ready.”
“He earns a fixed amount based on an hourly rate.”
“Our team has an hour-long training session this afternoon.”
“It was an hour before the power came back on.”
“We scheduled a one-hour appointment for Monday.”
These examples work in everyday conversation, workplace writing, school writing, and other standard US-English contexts.
Common Mistakes (and Quick Fixes)
The most common mistake is choosing a because hour starts with the letter h. Fix it by listening to the first sound instead: hour starts with a vowel sound, so use an.
Another mistake is assuming the same article must always appear somewhere near the word hour. The words before hour can change the answer.
For example, an hour-long class is correct because the article comes directly before hour-long. However, a one-hour class is correct because the article comes before one, which begins with a w sound.
The sound immediately following the article controls the choice.
Grammar Rule Details
Rule
Use an before a vowel sound and a before a consonant sound.
Because the initial h in hour is silent, an hour follows the normal rule. It is not a special exception to the sound-based system. e**
Write an hour whenever the article comes directly before hour in its normal pronunciation.
Examples include an hour ago, for an hour, in an hour, and about an hour.
The same sound pattern gives us an hourly wage and an hour-long delay.
Incorrect or Less Natural Usage
A hour is not standard in ordinary American English.
The error usually happens because a writer sees the consonant letter h and automatically chooses a. That method works only when the first written letter matches the first spoken sound.
With hour, it does not.
Examples
“The repair should take an hour.”
“We arrived an hour early.”
“She spent an hour preparing the presentation.”
“The company charges an hourly fee.”
“There was an hour-long delay at the airport.”
Common Mistakes
Do not memorize the oversimplified rule “use a before consonant letters and an before vowel letters.”
Instead, base the choice on pronunciation.
That single distinction explains why English uses an hour but a house, and an hour-long appointment but a one-hour appointment.
Exceptions
There is no meaningful exception for hour in standard modern US English: use an hour.
Some dialectal pronunciations or nonstandard speech may produce different forms, but they do not change the normal choice expected in standard American writing.
- Say the next word aloud.
- If its first sound is a vowel sound, choose an.
- If its first sound is a consonant sound, choose a.
Say hour aloud. The h disappears, so choose an.
Usage Notes
Always check the word immediately following the article.
Use an hour-long lesson because hour-long begins with a vowel sound.
Use a one-hour lesson because one begins with a consonant w sound.
This principle is more reliable than checking whether the next word begins with the written letters a, e, i, o, u, or a consonant. Is it an hour or a hour?**
An hour is correct in standard US English. The h in hour is silent, so the word begins with a vowel sound. English uses an before vowel sounds.
Why do we say an hour instead of a hour?
The choice between a and an depends on pronunciation, not simply spelling. Although hour starts with the letter h, that letter is not pronounced. The first spoken sound is therefore a vowel sound.
Is the H silent in hour?
Yes. In the standard pronunciation of hour, the initial h is silent. Cambridge’s pronunciation and examples reflect this pronunciation and use forms such as an hour. wage correct?**
Yes. An hourly wage is correct because hourly begins with the same vowel sound as hour. The silent h means an is the appropriate article.
Why is it an hour but a house?
The h in hour is silent, so use an. The h in house is pronounced, creating a consonant sound, so use a.
Is it an hour-long meeting or a one-hour meeting?
Both are correct. Use an hour-long meeting because hour-long begins with a vowel sound. Use a one-hour meeting because one begins with a w sound.
FAQ
Is it “an hour” or “a hour”?
An hour is correct in standard English. Although hour begins with the letter h, the h is silent. Because the word starts with a vowel sound when spoken, it takes an, not a.
Why do we say “an hour” instead of “a hour”?
English chooses between a and an based on pronunciation rather than spelling. Since hour sounds as though it begins with a vowel, we say an hour. The written letter h does not control the article choice.
Is the H silent in “hour”?
Yes. The h in hour is silent in standard American English. That is why hour begins with a vowel sound and uses an. Similar examples include an honest person and an honorable decision.
Is “a hour” ever correct?
In standard American English, a hour is not considered correct. The normal form is an hour. You may occasionally hear nonstandard or dialectal variations, but formal, academic, professional, and everyday standard writing should use an hour.
Is it “an hourly rate” or “a hourly rate”?
The correct phrase is an hourly rate. The word hourly begins with the same vowel sound as hour because the h remains silent. For example: “The contractor charges an hourly rate.”
Why is it “an hour” but “a one-hour meeting”?
The article depends on the sound immediately after it. In an hour, hour begins with a vowel sound. In a one-hour meeting, one begins with a w sound, which is a consonant sound. Therefore, both expressions are grammatically correct.
Conclusion
Use an hour, not a hour, in standard American English.
The easiest rule to remember is based on sound: use an before a vowel sound and a before a consonant sound. Since the h in hour is silent, hour begins with a vowel sound when spoken.
Once you focus on pronunciation rather than the first written letter, the choice becomes simple: an hour, an hourly rate, and an hour-long meeting—but a one-hour meeting.
