Have you ever hesitated while writing a date or position and wondered whether to use “13rd” or “13th”? It’s a very common confusion, especially when ordinal numbers come into play.
Don’t worry—this guide will make it super simple. By the end, you’ll clearly understand the correct form, why it works, and how to avoid this mistake forever.
Quick Answer: 13rd vs 13th
- ✅ 13th is the correct form
- ❌ 13rd is incorrect
Example:
✔️ Today is the 13th of April.
❌ Today is the 13rd of April.
What Does “13th” Mean?
The word 13th is an ordinal number, which shows position or order in a sequence.
Common uses of “13th”:
- Dates (April 13th)
- Rankings (13th place)
- Events (the 13th edition)
Examples in sentences:
- My birthday is on the 13th.
- She finished in 13th place in the race.
- The meeting is scheduled for the 13th of June.
Is “13rd” a Real Word?
No, “13rd” is not correct in English.
It’s a mistake that happens when people incorrectly apply the “rd” ending (used for 3rd) to other numbers like 13.
Why “13th” Is Correct (The Rule Explained)
Ordinal numbers follow a specific pattern in English:
- Numbers ending in 1 → st (1st, 21st)
- Numbers ending in 2 → nd (2nd, 22nd)
- Numbers ending in 3 → rd (3rd, 23rd)
- Most others → th
⚠️ Exception Rule (Very Important):
Numbers ending in 11, 12, and 13 always use “th”, not st/nd/rd.
👉 That’s why:
- 11 → 11th
- 12 → 12th
- 13 → 13th ✅
Ordinal Number Rule (Quick Visual)
1^{st},\ 2^{nd},\ 3^{rd},\ 4^{th},\ \dots,\ 11^{th},\ 12^{th},\ 13^{th}
13rd vs 13th: Key Differences Table
| Feature | 13rd ❌ | 13th ✅ |
|---|---|---|
| Correct form | No | Yes |
| Grammar type | Incorrect ordinal | Correct ordinal |
| Usage | Never used | Standard English |
| Example | ❌ 13rd day | ✔️ 13th day |
Common Mistakes to Avoid
Here are mistakes many people make:
❌ Using “rd” just because of the number 3
- Incorrect: 13rd
- Correct: 13th
❌ Forgetting the exception rule (11–13)
- Incorrect: 11st, 12nd, 13rd
- Correct: 11th, 12th, 13th
❌ Mixing ordinal patterns
- Always check if the number ends in 11, 12, or 13
How to Remember the Correct Form
Here’s an easy memory trick:
👉 “11, 12, 13 break the pattern—they always use ‘th’.”
No matter what, if you see 13 → think 13th.
When Should You Use “13th”?
Use 13th in all situations involving order or sequence:
📅 Dates
- 13th April
- June 13th
🏆 Rankings
- 13th position
- 13th winner
📚 General order
- 13th chapter
- 13th attempt
Examples in Everyday Context
- The event will take place on the 13th.
- He came 13th in the competition.
- This is the 13th time I’ve tried this recipe.
American vs British English Differences
There is no difference in spelling:
- 🇺🇸 American English: 13th
- 🇬🇧 British English: 13th
📌 Small formatting difference:
- US: April 13th
- UK: 13th April
Why Correct Usage Matters
Using the correct form 13th helps you:
- Write professionally
- Avoid grammar mistakes
- Improve clarity
- Build trust in academic and online writing
Even small errors like “13rd” can reduce the quality of your content.
FAQs About 13rd vs 13th
1. Is “13rd” ever correct?
No, “13rd” is always incorrect. The correct form is “13th.”
2. Why is it 13th and not 13rd?
Because numbers ending in 11, 12, and 13 always use “th.”
3. What are ordinal numbers?
They show position or order, like 1st, 2nd, 3rd, 4th.
4. Is 23rd correct?
Yes, because it doesn’t fall under the 11–13 exception.
5. How do I remember the rule easily?
Just remember: 11, 12, and 13 always take “th.”
6. Can I use “13th” in formal writing?
Yes, it’s standard in both formal and informal contexts.
7. Are there other tricky ordinal numbers?
Yes, especially 11th, 12th, and 13th due to the exception rule.
Final Summary
The confusion between 13rd vs 13th comes from misunderstanding ordinal number rules. While “rd” is used for numbers like 3rd and 23rd, it does not apply to 13. Due to a special exception in English, numbers ending in 11, 12, and 13 always use “th.”
Once you understand this simple rule, the confusion disappears. “13th” is the only correct form, and “13rd” should never be used in writing.
Actionable Takeaway
Next time you write a date or ranking, remember: 13 always ends with “th.” Practice using “13th” in sentences, and keep the exception rule in mind to avoid mistakes.
