Have you ever wondered whether occurring vs occuring is the correct spelling? You are not alone. These two forms look almost identical, but only one is accepted in standard English.
Occurring is the correct spelling, while occuring is a misspelling. The confusion usually happens because the base verb occur ends in one r, but the r is doubled when -ing is added: occur, occurring.
If you are writing an email, essay, report, academic paper, or professional document, knowing the difference can help you avoid a common spelling mistake.
Quick Answer
Occurring is correct.
Occuring is incorrect.
| Spelling | Status | Meaning |
|---|---|---|
| occurring | ✅ Correct | Happening, taking place, or being present |
| occuring | ❌ Incorrect | Misspelling of occurring |
Merriam-Webster lists occurred and occurring as forms of occur, while the Language Portal of Canada specifically confirms that occurred, occurrence, and occurring are spelled with a double r.
Correct: The problem is occurring again.
Incorrect: The problem is occuring again.
If you remember only one thing from this article, remember this:
occur + ing = occurring
What Does Occurring Mean?
Occurring is the present participle of the verb occur.
The word occur can have several meanings depending on context. It can mean:
- to happen
- to take place
- to exist or be present
- to be found somewhere
- to come to mind
Merriam-Webster gives these major senses of occur, including “to be found or met with,” “to come into existence,” and “to come to mind.”
Therefore, occurring can describe something that is:
- happening
- taking place
- developing
- arising
- existing
- being found or present
Examples
- Changes are occurring rapidly.
- Several problems are occurring at the same time.
- The reaction is occurring at a high temperature.
- This species is naturally occurring in the region.
- A strange thought was occurring to him.
The exact meaning depends on how the word is used in the sentence.
Why Is Occurring Spelled With Two Rs?
This is where the main spelling confusion begins.
The base verb is:
occur
Notice that occur itself ends with one r.
When -ing is added, the final consonant is doubled because the stress falls on the final syllable:
oc-CUR + ing → occurring
So:
occur → occurring
Not:
occur → occuring
The same spelling pattern appears in occurred:
occur → occurred
And in the noun:
occur → occurrence
The Language Portal of Canada confirms that occurred, occurrence, and occurring all use a double r.
The spelling pattern
Think of the word family this way:
occur → occurred → occurring → occurrence
Once you remember the double r in these forms, the spelling becomes much easier.
Occurring vs Occuring: What Is the Difference?
The difference is spelling, not meaning.
Occurring is the standard English form.
Occuring is a misspelling.
| Word | Correct? | Explanation |
|---|---|---|
| occurring | ✅ | Standard spelling |
| occuring | ❌ | Missing an r |
| occurred | ✅ | Past tense and past participle |
| occured | ❌ | Missing an r |
| occurrence | ✅ | Noun form |
| occurence | ❌ | Missing an r |
For example:
✅ The same error keeps occurring.
❌ The same error keeps occuring.
There is no separate meaning attached to occuring in standard English. It is simply an incorrect spelling of occurring.
Why Do People Spell Occurring as Occuring?
The mistake is easy to make because occur has an unusual visual pattern.
It contains:
o-c-c-u-r
When writers add -ing, they may instinctively write:
occur + ing = occuring
But the correct spelling requires the final r to be doubled:
occur + ing = occurring
Pronunciation can also contribute to the confusion. The two r letters do not mean that you pronounce two separate r sounds. As a result, the spelling contains information that may not be obvious from the sound alone.
There is also a broader spelling pattern at work. Verbs with stress on the final syllable can double their final consonant before endings such as -ing and -ed. Similar examples include:
- refer → referring
- prefer → preferring
- admit → admitting
- begin → beginning
- occur → occurring
The important point is not to memorize a complicated rule every time. For this word, the practical pattern is simply:
occur → occurring
Occurring vs Occurred vs Occurs
These three forms come from the same verb, but they have different grammatical functions.
Occur
Occur is the base form.
Problems can occur without warning.
Occurs
Occurs is the third-person singular present form.
The error often occurs after installation.
Occurred
Occurred is the past tense and past participle.
The error occurred yesterday.
Occurring
Occurring is the present participle.
The error is occurring again.
A simple comparison makes the difference clear:
- Problems occur unexpectedly.
- The problem occurs frequently.
- The problem occurred yesterday.
- The problem is occurring again.
Merriam-Webster lists occurred and occurring as inflected forms of occur.
Is Occuring Ever Correct?
No. Occuring is not the standard spelling of the present participle of occur.
The correct form is:
occurring
The incorrect form is:
occuring
You may still encounter occuring online, in informal writing, or in user-generated content. Its appearance does not make it an accepted spelling.
If you are proofreading a document and see occuring, replace it with occurring.
For example:
❌ A technical issue is occuring during installation.
✅ A technical issue is occurring during installation.
The Word Family of Occur
Learning related forms together is one of the best ways to remember the spelling.
| Word | Grammatical role | Example |
|---|---|---|
| occur | Base verb | Mistakes can occur. |
| occurs | Present tense | The problem occurs often. |
| occurred | Past tense | The problem occurred yesterday. |
| occurring | Present participle | The problem is occurring now. |
| occurrence | Noun | It was an unusual occurrence. |
| occurrences | Plural noun | Similar occurrences were reported. |
Notice the important spelling pattern:
occur → occurred → occurring → occurrence
The double r appears in the derived forms that often cause spelling mistakes.
The Language Portal of Canada specifically highlights occurred, occurrence, and occurring as words that retain the double r.
Occurring vs Occurrence
Because these words look similar, they are sometimes confused.
Occurring is a verb form.
Several changes are occurring.
Occurrence is a noun.
The event was a rare occurrence.
The easiest way to distinguish them is to ask what role the word plays.
If it describes something happening, you may need occurring.
If it names an event or instance, you may need occurrence.
Compare
- The problem is occurring again.
- This is an unusual occurrence.
Both words contain the important double r.
How to Remember the Spelling of Occurring
The simplest memory trick is to memorize the base word and its -ing form together:
occur → occurring
Then focus on the last part:
CUR → CURRING
You can also remember this sentence:
“Something occurring needs two Rs.”
Another useful chain is:
occur → occurred → occurring
If you remember that occurred has two r letters, you are more likely to remember the same pattern in occurring.
The easiest spelling check
When you hesitate, write:
O-C-C-U-R-R-I-N-G
That gives you:
occurring
Not:
O-C-C-U-R-I-N-G
Examples of Occurring in Sentences
Seeing the word in different contexts makes its usage clearer.
Everyday English
- The same mistake keeps occurring.
- Something strange is occurring outside.
- Several changes are occurring at once.
Academic Writing
- Researchers observed several reactions occurring during the experiment.
- The study examined how changes were occurring over time.
Business Writing
- Technical problems are occurring more frequently.
- Several changes are occurring within the organization.
Science
- The chemical reaction is occurring at a higher temperature.
- The species is naturally occurring in this environment.
Technology
- An unexpected error is occurring during installation.
- The issue keeps occurring after the update.
Formal Writing
- Several significant changes are occurring within the industry.
- The events occurring during this period were carefully documented.
Synonyms for Occurring
The best synonym depends on the context.
Common alternatives include:
- happening
- taking place
- arising
- developing
- unfolding
- emerging
- coming about
- appearing
- existing
- being present
For example:
A problem is occurring.
could sometimes become:
A problem is happening.
or:
A problem is arising.
However, these words are not always interchangeable. Occurring is often useful when referring neutrally to an event, process, condition, or phenomenon.
The Language Portal of Canada also notes that occur can sometimes be replaced by more precise words such as happen, take place, exist, or be, depending on context.
Is Occurring the Same in American and British English?
Yes.
There is no American-versus-British spelling difference between occurring and occuring.
Both varieties use:
occurring
The incorrect form remains:
occuring
So whether you are writing for an American, British, Canadian, or international audience, occurring is the spelling to use.
How Do You Pronounce Occurring?
Occurring is commonly pronounced approximately:
uh-KUR-ing
The stress falls on the middle part of the word:
oc-CUR-ring
The double r is primarily a spelling feature. You do not need to pronounce two separate r sounds simply because the word contains rr.
Merriam-Webster gives pronunciations for occur and identifies occurring as one of its inflected forms.
What Does Occur Mean?
Understanding occur makes occurring easier to use correctly.
The verb occur commonly has three broad meanings.
1. To happen
The accident occurred at midnight.
2. To be found or present
This plant occurs naturally in the region.
3. To come to mind
It suddenly occurred to me that I had forgotten my keys.
Merriam-Webster identifies these three major senses of occur.
This means occurring does not always simply mean “happening.” Context determines the precise meaning.
Common Spelling Mistakes With Occur
Once you learn occurring, it is useful to recognize other common errors from the same word family.
Occuring vs Occurring
❌ occuring
✅ occurring
Occured vs Occurred
❌ occured
✅ occurred
Occurence vs Occurrence
❌ occurence
✅ occurrence
Occurance vs Occurrence
❌ occurance
✅ occurrence
The safest approach is to remember the core spelling:
O-C-C-U-R
Then learn the common forms:
occur → occurred → occurring → occurrence
Quick Comparison: Occurring vs Occuring
| Feature | Occurring | Occuring |
|---|---|---|
| Correct spelling | ✅ Yes | ❌ No |
| Standard English | ✅ Yes | ❌ No |
| Present participle of occur | ✅ Yes | ❌ No |
| Double R | ✅ Yes | ❌ No |
| Used in American English | ✅ Yes | ❌ No |
| Used in British English | ✅ Yes | ❌ No |
| Meaning | Happening, taking place, etc. | No standard meaning |
The answer is therefore straightforward:
occurring = correct
occuring = incorrect
FAQs
1: Is it occurring or occuring?
Occurring is correct. Occuring is a misspelling.
2: Why does occurring have two Rs?
The base verb is occur. When -ing is added, the final consonant is doubled because the stress falls on the final syllable:
occur → occurring
3: Is occuring a word?
Occuring is not the standard spelling of the present participle of occur. Use occurring instead.
4: What does occurring mean?
Occurring generally means happening or taking place. Depending on context, it can also relate to something existing or being present.
5: How do you spell occurring?
Spell it:
O-C-C-U-R-R-I-N-G
The easiest shortcut is:
occur + ing = occurring
6: Is occurring used in American and British English?
Yes. Occurring is the standard spelling in both American and British English.
7: What is the difference between occurring and occurred?
Occurring describes an ongoing action or process, while occurred refers to something that happened in the past.
The problem is occurring now.
The problem occurred yesterday.
8: What is the noun form of occurring?
The related noun is occurrence.
The incident was an unusual occurrence.
9: What are synonyms for occurring?
Depending on context, synonyms include happening, taking place, arising, developing, unfolding, and coming about.
10: Does occur have one R or two?
The base verb occur ends with one r:
occur
When the -ing ending is added, the final r doubles:
occurring
That distinction is important because saying that occur already contains “rr” is incorrect.
Final Verdict:
When it comes to occurring vs occuring, occurring is the only correct spelling in standard English, while occuring is a misspelling.
The easiest way to remember the correct form is to start with the base verb occur and add -ing: occur → occurring.
The final r doubles before -ing, giving us O-C-C-U-R-R-I-N-G. You can also remember the related forms occur → occurred → occurring → occurrence, which all help reinforce the correct spelling pattern.
Whether you are writing an email, essay, report, academic assignment, website, or professional document, always choose occurring. When in doubt, remember: Two Cs. Two Rs. Occurring.
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Hi, I’m Olivia Bennett, a dedicated grammar writer at GrammarHQ.com.
I specialize in simplifying spelling differences, confusing words, and English grammar concepts, helping readers write with greater clarity, accuracy, and confidence.
