If you’ve ever hesitated between 13rd vs 13th, you’re not alone. The confusion makes sense because 3rd, 23rd, and 33rd all use the -rd ending. So why doesn’t 13 follow the same pattern?The answer is simple: 13th is correct, while 13rd is incorrect in standard English.The correct ordinal form of 13 is 13th, and its full written form is thirteenth.
You use it when you describe position, order, dates, sequences, rankings, or anything that comes in the If you’ve ever wondered whether 13rd or 13th is correct, you’re not alone. Ordinal numbers can be surprisingly tricky, especially when you’re writing dates, rankings, or numbered lists. The correct form is 13th, not 13rd.
This is because numbers ending in 3 usually take the -rd ending, such as 3rd and 23rd, but 13 is an important exception. Numbers from 11 to 13 follow the -th pattern, so we write 11th, 12th, and 13th. For example, you’d write “June 13th” or “She finished in 13th place.” Understanding this small rule can help you avoid a common spelling and grammar mistake. Once you know the pattern, choosing between 13rd vs 13th becomes quick and easy.
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13rd vs 13th: The Quick Answer
The correct form is 13th.
13rd is not a standard English ordinal form. It results from incorrectly applying the ending used by numbers such as 3rd and 23rd.
| Form | Correct? | Meaning |
| 13 | Yes | Cardinal number |
| thirteen | Yes | Cardinal number written out |
| 13th | Yes | Ordinal number |
| thirteenth | Yes | Ordinal number written out |
| 13rd | No | Incorrect ordinal form |
A useful way to remember this is to look at the last two digits, not just the final digit.
Compare these examples:
- 3rd
- 13th
- 23rd
- 33rd
- 43rd
- 53rd
Although several of these numbers end in 3, they don’t all take -rd.
The number 13 belongs to the special group of numbers ending in 13. Those numbers use -th.
Why Is 13th Correct?
The English ordinal number for 13 is thirteenth.
Its abbreviated form is 13th.
The distinction becomes clearer when you compare cardinal and ordinal numbers. A cardinal number tells you how many things exist. An ordinal number tells you the position of something in a sequence.
For example:
- 13 students attended the class.
- The 13th student arrived late.
In the first sentence, 13 tells you the quantity. In the second, 13th tells you the student’s position.
The same principle appears throughout English:
| Cardinal | Ordinal | Written Ordinal |
| 1 | 1st | first |
| 2 | 2nd | second |
| 3 | 3rd | third |
| 4 | 4th | fourth |
| 12 | 12th | twelfth |
| 13 | 13th | thirteenth |
| 14 | 14th | fourteenth |
| 20 | 20th | twentieth |
| 21 | 21st | twenty-first |
| 23 | 23rd | twenty-third |
The key point is that 13 doesn’t become 13rd simply because it ends in 3.
English treats 13 as part of the -th group.
Why Is 13rd Incorrect?
The mistake usually comes from a simple pattern.
You may already know:
- 1st
- 2nd
- 3rd
- 4th
- 21st
- 22nd
- 23rd
That pattern can make 13rd look reasonable at first glance.
However, English ordinal endings don’t always depend on the final digit alone.
The final two digits matter for numbers ending in 11, 12, and 13.
That’s why these forms are correct:
- 11th
- 12th
- 13th
Even though 21 ends in 1, 22 ends in 2, and 23 ends in 3, they return to the familiar endings:
- 21st
- 22nd
- 23rd
So the shortcut “numbers ending in 3 always use -rd” isn’t reliable.
A better rule is:
Numbers ending in 13 use -th.
That rule continues to work with larger numbers.
The Rule for Ordinal Numbers Ending in 13
Here’s the most useful rule to remember:
Any number whose final two digits are 13 takes the ordinal ending -th.
For example:
- 13th
- 113th
- 213th
- 313th
- 413th
- 1,013th
- 2,013th
Notice the pattern. Each number ends with 13, so each one takes -th.
Now compare them with numbers that don’t end in 13:
- 103rd
- 203rd
- 303rd
- 403rd
- 1,003rd
- 2,003rd
The difference becomes obvious when you focus on the final two digits.
Why the Last Two Digits Matter
Consider these four numbers:
- 3rd
- 13th
- 23rd
- 33rd
Their final digits look similar. Their ordinal endings don’t.
The number 13 is special because of the complete 13 ending.
This same pattern applies to 11 and 12:
- 11th
- 12th
- 13th
- 21st
- 22nd
- 23rd
That’s why checking only the final digit can lead you into trouble.
13th vs Other Ordinal Numbers
Understanding 13th becomes much easier when you compare it with nearby forms.
12th, 13th, and 14th
The sequence is:
12th → 13th → 14th
In words:
twelfth → thirteenth → fourteenth
All three use the -th ending in their abbreviated forms.
Examples include:
- the 12th chapter
- the 13th chapter
- the 14th chapter
You wouldn’t write 12st, 13rd, or 14rd.
The correct forms are determined by English ordinal rules.
13th, 23rd, and 33rd
This comparison causes many mistakes.
| Number | Correct Ordinal | Written Form |
| 3 | third | 3rd |
| 13 | thirteenth | 13th |
| 23 | twenty-third | 23rd |
| 33 | thirty-third | 33rd |
| 43 | forty-third | 43rd |
| 113 | one hundred thirteenth | 113th |
The important distinction is 13 versus 23, 33, 43, and similar numbers.
The number 13 has its own ordinal form: thirteenth.
Cardinal vs. Ordinal: 13 vs. 13th
A lot of confusion disappears once you understand the difference between 13 and 13th.
A cardinal number answers a question such as:
How many?
An ordinal number answers:
Which one in the sequence?
For example:
There are 13 books on the shelf.
Here, 13 tells you the quantity.
Now consider:
The 13th book is my favorite.
Here, 13th tells you the position.
The difference is small in appearance but important in meaning.
| Sentence | Number Type | Meaning |
| I bought 13 books. | Cardinal | Quantity |
| I bought the 13th book in the series. | Ordinal | Position |
| She has 13 tickets. | Cardinal | Quantity |
| She used the 13th ticket first. | Ordinal | Sequence |
This distinction applies to dates, rankings, chapters, floors, editions, attempts, and many other contexts.
How to Write 13th in Words
The full written form of 13th is thirteenth.
The relationship looks like this:
13 → thirteen → 13th → thirteenth
Be careful because thirteen and thirteenth aren’t interchangeable.
- thirteen = cardinal number
- thirteenth = ordinal number
For example:
Thirteen students attended the meeting.
But:
The thirteenth student arrived late.
The second sentence describes position rather than quantity.
Common Spelling Mistakes
Because thirteenth is longer than thirteen, writers sometimes misspell it.
The correct spelling is:
thirteenth
Not:
- thirteenthh
- thirteeth
- thirteenth
- thirteenth
The safest approach is to remember the base word thirteen and add the ordinal ending appropriately.
How to Use 13th in Dates
One of the most common uses of 13th involves dates.
For example:
- May 13th
- June 13th
- August 13th
- December 13th
You can also write the date using the full ordinal word:
- May thirteenth
- June thirteenth
- August thirteenth
In everyday American English, both the numeral form and the spelled-out form can appear depending on the context and style.
For example:
The meeting is scheduled for May 13th.
Or:
The meeting is scheduled for May thirteenth.
In formal documents, however, many style systems prefer simpler numeric date formats such as May 13. The exact choice depends on the publication or organization’s style rules.
The crucial point remains unchanged:
13th is correct. 13rd is not.
Is 13th Correct in Dates?
Yes.
You can use 13th when expressing the ordinal day of a month.
Examples:
- The package arrived on the 13th.
- The conference begins on May 13th.
- Her birthday is June 13th.
- The deadline falls on the 13th.
If you use the full written form, write thirteenth.
How to Use 13th in Rankings
The ordinal form 13th also appears when describing rankings.
For example:
The runner finished 13th in the marathon.
The number doesn’t describe how many runners participated. It describes the runner’s position.
Other examples include:
- The team finished 13th overall.
- She ranked 13th in the national competition.
- The player placed 13th after the final round.
- The company ranked 13th among the listed firms.
Compare:
Thirteen athletes competed.
with:
One athlete finished 13th.
The first sentence gives a quantity. The second gives a position.
How to Use 13th for Sequences and Order
Whenever you identify something as number thirteen in a sequence, 13th is usually the appropriate ordinal form.
You might see it in phrases such as:
- 13th chapter
- 13th episode
- 13th attempt
- 13th edition
- 13th anniversary
- 13th question
- 13th floor
- 13th row
- 13th position
- 13th round
Here are some natural examples:
Read the 13th chapter before starting the assignment.
This is her 13th attempt at the certification exam.
The show returned for its 13th season.
Their office is located on the 13th floor.
Writing 13rd in these sentences would be incorrect.
13th in Formal and Academic Writing
In formal writing, 13th and thirteenth can both be grammatically correct.
The choice often depends on the style rules being followed.
For example:
The 13th chapter discusses the research findings.
You could also write:
The thirteenth chapter discusses the research findings.
Neither sentence changes the underlying grammatical meaning.
However, consistency matters. If a document uses numerals for similar ordinal numbers, switching randomly between forms can make the writing look untidy.
For example, a document might choose:
- 11th
- 12th
- 13th
- 14th
Or it might spell them out:
- eleventh
- twelfth
- thirteenth
- fourteenth
The important thing is to follow the relevant style requirements consistently.
When Should You Spell Out Thirteenth?
Spelling out thirteenth can work well in prose when the surrounding style uses words for smaller numbers.
For example:
The thirteenth chapter provides the strongest evidence.
Using 13th may look cleaner in technical material, tables, lists, or compact references:
See 13th Chapter for additional details.
The context should guide the choice.
13th in Addresses, Names, and Titles
You may also encounter 13th as part of a street name, avenue, organization, unit, or official designation.
Examples include:
- 13th Street
- 13th Avenue
- 13th Amendment
- 13th Regiment
- 13th District
- 13th Battalion
In these contexts, 13th functions as part of a name or designation.
For example:
The restaurant is located on 13th Street.
Or:
The 13th Amendment abolished slavery in the United States.
The ordinal ending remains -th.
Writing 13rd Street would not be the standard form.
13rd vs 13th: Common Mistakes
The biggest mistake is straightforward: writing 13rd because the number ends in 3.
Mistake: 13rd
Incorrect:
The meeting is on the 13rd.
Correct:
The meeting is on the 13th.
Mistake: Treating Every Number Ending in 3 the Same
This shortcut causes problems.
You might correctly write:
- 3rd
- 23rd
- 33rd
Then assume 13rd follows the same pattern.
It doesn’t.
The correct sequence is:
- 3rd
- 13th
- 23rd
- 33rd
Mistake: Confusing 13 With 13th
Consider:
The course has 13 lessons.
That’s correct because 13 describes quantity.
Now:
The 13th lesson covers verb tenses.
That’s also correct because 13th describes position.
Replacing one with the other can change the meaning.
Mistake: Assuming the Final Digit Always Controls the Ending
The final digit helps with many ordinal numbers, but it isn’t enough by itself.
Compare:
- 1st
- 11th
- 21st
- 31st
The number 11 breaks the simple final-digit pattern.
The same happens with 2 and 12, as well as 3 and 13.
That’s why the final two digits provide a safer shortcut.
13rd vs 13th Examples
The easiest way to understand the distinction is to see it in real sentences.
| Incorrect | Correct |
| The event starts on the 13rd. | The event starts on the 13th. |
| She finished 13rd in the race. | She finished 13th in the race. |
| Read the 13rd chapter. | Read the 13th chapter. |
| He lives on 13rd Street. | He lives on 13th Street. |
| This is our 13rd meeting. | This is our 13th meeting. |
| The company released its 13rd edition. | The company released its 13th edition. |
| She made her 13rd attempt. | She made her 13th attempt. |
| They reached the 13rd position. | They reached the 13th position. |
More Examples With 13th
Dates
The appointment is scheduled for the 13th.
Rankings
Our team finished 13th in the tournament.
Chapters
The answer appears in the 13th chapter.
Attempts
He passed on his 13th attempt.
Editions
The publisher released the 13th edition.
Anniversaries
They celebrated their 13th anniversary.
Floors
The office is on the 13th floor.
Questions
The answer to the 13th question is C.
In every example, 13th identifies position or order.
A Simple Rule for 13th
Here’s the easiest memory trick:
13 always takes -th
Think of the sequence:
11th → 12th → 13th → 14th
That makes the correct ending easier to remember.
For larger numbers, check the final two digits.
| Number | Ending | Correct Ordinal |
| 3 | 3 | 3rd |
| 13 | 13 | 13th |
| 23 | 23 | 23rd |
| 33 | 33 | 33rd |
| 103 | 03 | 103rd |
| 113 | 13 | 113th |
| 123 | 23 | 123rd |
| 213 | 13 | 213th |
| 223 | 23 | 223rd |
This table reveals the real pattern.
13 gets -th because its final two digits are 13.
A Closer Look at 11th, 12th, and 13th
The three numbers from 11 through 13 deserve special attention.
Their ordinal forms are:
- 11th — eleventh
- 12th — twelfth
- 13th — thirteenth
Notice that all three use -th in their abbreviated forms.
Then the pattern changes:
- 21st — twenty-first
- 22nd — twenty-second
- 23rd — twenty-third
This is why ordinal numbers shouldn’t be formed by looking only at the final digit.
The endings 11, 12, and 13 override the usual 1st, 2nd, and 3rd pattern.
13th vs 113th vs 1,013th
The same rule continues with larger numbers.
Consider:
- 13th
- 113th
- 1,013th
- 2,013th
All four end in 13.
Therefore, all four take -th.
Now compare:
- 23rd
- 123rd
- 1,023rd
- 2,023rd
These end in 23, so they take -rd.
This gives you a reliable way to handle unfamiliar large numbers.
The Practical Test
When you’re unsure about an ordinal ending:
Look at the final two digits.
If they are:
- 11 → -th
- 12 → -th
- 13 → -th
Otherwise, the final digit usually determines the ending:
- 1 → -st
- 2 → -nd
- 3 → -rd
- 0, 4–9 → -th
For example:
- 31st
- 42nd
- 53rd
- 64th
- 75th
- 86th
- 97th
- 101st
- 112th
- 113th
- 122nd
- 123rd
This is a useful general rule for English ordinal abbreviations.
Case Study: Why 13rd Looks Right at First
Imagine you’re writing a sentence about a race.
You know that 3rd is correct. You also know that 23rd is correct.
Then you write:
She finished 13rd.
At first glance, the form looks logical.
The mistake comes from treating the final 3 as the only relevant part of the number.
Now look at the complete number:
13
Its written ordinal form is:
thirteenth
That immediately gives you:
13th
This is a good example of why grammar shortcuts can sometimes backfire. A pattern that works in one situation doesn’t necessarily work everywhere.
Is 13th Correct for Dates?
Yes. 13th is a correct ordinal form for the thirteenth day of a month.
Examples:
- January 13th
- February 13th
- March 13th
- April 13th
- May 13th
- June 13th
- July 13th
- August 13th
- September 13th
- October 13th
- November 13th
- December 13th
However, don’t assume every formal date format requires an ordinal suffix.
For example, a style guide may prefer:
August 13, 2026
instead of:
August 13th, 2026
Both forms can appear in English, but specific writing contexts may favor one over the other.
The grammar question itself is straightforward: if you use an ordinal abbreviation for 13, it is 13th, never 13rd.
Is 13th or Thirteenth Better?
Both forms represent the same ordinal number.
13th is the abbreviated form.
Thirteenth is the full written form.
Choose based on context and consistency.
Use 13th When:
- Space matters.
- You’re writing a table.
- You’re listing rankings.
- You’re labeling a chapter or section.
- You’re using a compact date style.
- You’re working with technical information.
Use thirteenth When:
- The surrounding text spells out numbers.
- The writing style favors words.
- You want a more literary or formal sentence.
- The number appears naturally in prose.
For example:
She finished 13th in the competition.
Or:
She finished thirteenth in the competition.
Both communicate the same position.
FAQS
Is 13rd correct?
No. 13rd is incorrect in standard English. The correct ordinal abbreviation is 13th.
Is it 13rd or 13th?
It is 13th. The full form is thirteenth.
Why isn’t 13rd correct?
Because the ordinal form of 13 is thirteenth. Numbers ending in 13 use the -th ending.
How do you write 13th in words?
You write 13th as thirteenth.
Is 13th correct for dates?
Yes. 13th can identify the thirteenth day of a month.
For example:
The appointment is on June 13th.
Some formal styles instead prefer June 13.
What is the ordinal number for 13?
The ordinal number is 13th, written out as thirteenth.
Is 113rd correct?
No. 113th is correct because the final two digits are 13.
Is 123rd correct?
Yes. 123rd is correct because the final two digits are 23.
Why is 23rd correct but 13th isn’t?
Because 23 ends in 23, while 13 ends in 13. Numbers ending in 13 use -th.
Is 13th Street correct?
Yes. 13th Street is the standard ordinal form when the street is designated as thirteenth.
Conclusion
The correct form is always 13th, while 13rd is incorrect in standard English. Although numbers ending in 3 often use -rd, the number 13 is an exception because it belongs to the 11th, 12th, 13th group. So, whenever you write the ordinal form of 13, use 13th. Whether you’re writing a date, ranking, age, or position, 13th is the safe and grammatically correct choice.
