An hour is correct. A hour is incorrect because the h in hour is silent, so the word begins with a vowel sound.
Use an hour when referring to a period of 60 minutes.
Correct: I need an hour to finish this assignment.
Incorrect: I need a hour to finish this assignment.
The rule is simple: Choose a or an based on the first sound of the following word, not its first letter.
Quick Answer: An Hour or A Hour?
| Expression | Correct? | Reason |
|---|---|---|
| An hour | Yes | Hour begins with a vowel sound because its h is silent. |
| A hour | No | A is used before consonant sounds, not the vowel sound in hour. |
Remember: Always write an hour, never a hour, in standard English.
Why Is “An Hour” Correct?
The expression an hour is grammatically correct because the word hour begins with a vowel sound, /aʊ/, despite starting with the consonant letter h.
In English, the indefinite articles a and an are selected according to pronunciation rather than spelling.
Since the h in hour is silent, the word sounds like “our.” Therefore, it takes an.
Examples:
- We have an hour before the meeting.
- She waited for an hour outside the office.
- It takes about an hour to prepare dinner.
- I spent an hour studying for the exam.
- He will arrive in an hour.
In each sentence, an is necessary because hour starts with a vowel sound.
Why Is “A Hour” Incorrect?
A hour is incorrect in standard English because the article a normally comes before a consonant sound. However, hour begins with a vowel sound because its initial h is silent.
For example:
Incorrect: The journey takes a hour.
Correct: The journey takes an hour.
The same rule applies when an adjective comes between the article and the noun.
- Correct: We had an entire hour to complete the task.
- Correct: She needs an extra hour to get ready.
- Correct: It was an enjoyable hour.
The important point is that the article must match the first sound of the word immediately following it.
The Difference Between A and An
Both a and an are indefinite articles. They introduce a singular countable noun when referring to something nonspecific.
The difference is based on sound.
When to Use “A”
Use a before a word that begins with a consonant sound.
Examples:
- A book
- A house
- A teacher
- A university
- A European country
- A one-hour meeting
Notice that university, European, and one-hour begin with consonant sounds (/j/ or /w/), even though their first written letters are vowels.
When to Use “An”
Use an before a word that begins with a vowel sound.
Examples:
- An apple
- An orange
- An umbrella
- An honest person
- An hour
- An interesting idea
In honest and hour, the letter h is silent. This is why both words take an.
An Hour in Example Sentences
Understanding how an hour works in different sentences makes it easier to use the expression correctly.
- I will finish the project in an hour.
- The meeting lasted an hour.
- She spends an hour reading every evening.
- We waited for an hour at the station.
- He needs an hour to prepare for the interview.
- The doctor will see you in about an hour.
- It took us an hour to reach the airport.
- Give me an hour to organize these files.
- They completed the examination in an hour.
- I exercise for an hour every morning.
All these examples use an hour because hour begins with a vowel sound.
Common Mistakes With A Hour and An Hour
One common grammar mistake is choosing an article based on the first letter instead of the first sound.
Compare these examples:
| Incorrect | Correct |
|---|---|
| A hour | An hour |
| A honest person | An honest person |
| An university | A university |
| An European city | A European city |
| A umbrella | An umbrella |
| An one-hour meeting | A one-hour meeting |
The correct choice depends on pronunciation, not spelling.
Frequently Asked Questions
Is It “An Hour” or “A Hour”?
An hour is correct. The h in hour is silent, so the word begins with a vowel sound. Therefore, it requires an, not a.
Why Is There an N in “An Hour”?
The n is part of the indefinite article an. English uses an before vowel sounds to make pronunciation flow naturally between words.
Is the H Silent in Hour?
Yes. The h in hour is silent. The word is pronounced /aʊər/ in many varieties of American English, which is why it takes an.
Is It “An Hour Ago” or “A Hour Ago”?
An hour ago is correct. The word hour begins with a vowel sound, so it requires an.
Is “A One-Hour Meeting” Correct?
Yes. A one-hour meeting is correct because one begins with a /w/ sound, which is a consonant sound. The article agrees with one, not hour.
Is It “An Hour and a Half” or “A Hour and a Half”?
An hour and a half is correct. The first word after the article is hour, which begins with a vowel sound.
Can I Say “A Few Hours”?
Yes. A few hours is correct because few begins with the consonant sound /f/. The article applies to few, not directly to hours.
Final Verdict: An Hour vs. A Hour
An hour is the correct expression in standard English. A hour is incorrect because the h in hour is silent, making its first sound a vowel.
Use an hour whenever you refer to a period of 60 minutes.
Easy rule to remember: Choose a before consonant sounds and an before vowel sounds. The sound matters more than the first letter.
