Tomorrow vs Tommorow: Which Spelling Is Correct?

Have you ever typed “Tomorrow vs Tommorow” and wondered whether it is actually correct? You are not alone. Tomorrow vs tommorow look almost identical, so it is easy to accidentally add an extra m when writing quickly.

The correct spelling is tomorrow with one m and two r’s.

Tommorow is a misspelling and should not be used in standard English. Major dictionaries, including Merriam-Webster and Cambridge Dictionary, list tomorrow as the standard form.

In this guide, you will learn the difference between tomorrow vs tommorow, why the mistake happens, how to remember the correct spelling, and how to use tomorrow naturally in sentences.

Tomorrow vs Tommorow: Which One Is Correct?

The answer is simple: tomorrow is correct, while tommorow is incorrect.

The Correct Spelling: Tomorrow

Tomorrow is spelled:

T-O-M-O-R-R-O-W

Notice the spelling pattern:

• One m
• Two r’s
• Ends with ow

The word tomorrow means the day after today. It can function as both an adverb and a noun. Cambridge Dictionary gives the same core meaning and provides examples such as doing something tomorrow or referring to tomorrow’s meeting.

Examples:

• I will call you tomorrow.
• We have an important meeting tomorrow.
• She is leaving tomorrow morning.
• Tomorrow is another day.

The Incorrect Spelling: Tommorow

Tommorow is incorrect because it contains two m’s:

T-O-M-M-O-R-O-W ❌

There is no standard English spelling tommorow.

Merriam-Webster specifically identifies tommorow and tommorrow, among other variants, as common misspellings of tomorrow.

Quick Comparison

Spelling	Correct?	Example
tomorrow	✅ Yes	I will see you tomorrow.
tommorow	❌ No	Incorrect spelling
tommorrow	❌ No	Incorrect spelling
tomorow	❌ No	Incorrect spelling
tomarrow	❌ No	Incorrect spelling

Easy answer: If you are choosing between tomorrow vs tommorow, always choose tomorrow.

Why Is Tomorrow Spelled With One M and Two R’s?

The spelling becomes easier to remember when you understand how the word is built.

Think of Tomorrow as “To + Morrow”

One useful way to remember tomorrow is to break it into:

to + morrow = tomorrow

The word morrow is an older English word associated with the morning or the following day. Merriam-Webster traces tomorrow back to Middle English to morgen, from Old English tō morgen, involving to and morrow/morning.

This explains why the word does not need a second m.

Instead, the important spelling pattern is:

TO + MORROW → TOMORROW

Remember “Morrow”

If you remember the spelling of morrow, the spelling of tomorrow becomes much easier.

Morrow:

M-O-R-R-O-W

Now add to:

TO + MORROW = TOMORROW

So you get:

One M + Two R’s = TOMORROW

A Simple Memory Trick

Try this:

Tomorrow has one M because “morrow” starts with one M.

Then remember:

One M, two R’s tomorrow is the right choice.

This is more reliable than simply trying to memorize all seven letters individually.

How to Use Tomorrow Correctly in a Sentence

The word tomorrow is usually used to talk about the day after today, but it can also refer more broadly to the future. Cambridge Dictionary lists both meanings.

Tomorrow as an Adverb

When tomorrow tells us when something will happen, it works as an adverb.

Examples:

• I will finish the project tomorrow.
• We are traveling tomorrow.
• She will call me tomorrow.
• They are arriving tomorrow evening.

Here, tomorrow tells us when the action happens.

Tomorrow as a Noun

Tomorrow can also function as a noun.

Examples:

• Tomorrow is a new day.
• We should prepare for tomorrow.
• I am looking forward to tomorrow.
• What are your plans for tomorrow?

In these examples, tomorrow refers to the day after today or, depending on context, the future.

Tomorrow in Possessive Expressions

You may also see tomorrow’s when something belongs to or is associated with tomorrow.

Examples:

• I am preparing for tomorrow’s meeting.
• Did you check tomorrow’s schedule?
• We need to discuss tomorrow’s event.
• She is organizing tomorrow’s lesson.

The spelling remains tomorrow before the apostrophe:

tomorrow’s ✅
tommorow’s ❌

Common Misspellings of Tomorrow

Tomorrow is a word people frequently spell incorrectly because its pronunciation does not make every letter obvious.

Tommorow

Tommorow is one of the most common mistakes.

❌ I will finish it tommorow.
✅ I will finish it tomorrow.

The problem is the extra m.

Tommorrow

Some writers add both an extra m and an extra r:

❌ tommorrow
✅ tomorrow

This version has too many letters in the middle.

Tomorow

Another common mistake is leaving out one of the two r’s:

❌ tomorow
✅ tomorrow

Remember that tomorrow has two r’s.

Tomarrow

Some people replace the o after tom with a:

❌ tomarrow
✅ tomorrow

The correct sequence is:

tom-or-row

not:

tom-ar-row

A 2026 Spelling Check: What Do Major Dictionaries Say?

When there is uncertainty about a spelling, authoritative dictionaries are among the best places to verify the standard form.

Current Dictionary Evidence

Merriam-Webster’s current dictionary entry defines tomorrow as the day after the present day and lists tomarrow, tommorow, tommorrow, and tomorow as common misspellings.

Merriam-Webster also published an updated Commonly Misspelled Words resource in February 2026 that specifically highlights tomorrow and explains the spelling through morrow.

Cambridge Dictionary likewise lists tomorrow as the standard English word meaning the day after today and provides examples of its use as both a noun and adverb.

What This Data Tells Us

The important takeaway from the 2026 reference data is not that English has competing spellings. Rather, major dictionary sources consistently recognize tomorrow as the standard spelling while treating forms such as tommorow as errors.

2025–2026 Reference Check	Finding
Merriam-Webster dictionary	tomorrow is the standard entry
Merriam-Webster 2026 misspelling guide	Identifies tommorow and other variants as misspellings
Cambridge Dictionary	Lists tomorrow as the standard English form
Standard spelling	One M + Two R’s

For grammar and spelling content, this kind of first-party dictionary evidence is more useful than relying on random spelling websites.

Case Study: Why People Write “Tommorow” Instead of “Tomorrow”

Imagine a student writing an email to a teacher:

“I will submit my assignment tommorow.”

At first glance, the sentence looks perfectly understandable. The reader will probably know that the student means tomorrow. However, the spelling is still incorrect.

Why did the mistake happen?

The student may have remembered that tomorrow contains a repeated sound in the middle and unconsciously added another m. This is a common type of spelling error: writers sometimes add letters because a word’s pronunciation or visual pattern makes the repetition feel natural.

Now consider the correction:

“I will submit my assignment tomorrow.”

The difference is only one letter, but the second version follows standard English spelling.

A useful strategy for the student would be to stop thinking of the word as one long sequence of letters. Instead, they can remember to + morrow. The word morrow contains one m and two r’s, giving the complete spelling tomorrow.

The same technique works outside school. A job applicant might write, “I will send the documents tommorow,” in a professional email. Although the recipient can understand the message, the spelling error may make the writing look less polished. In professional, academic, or published writing, using the standard form tomorrow is therefore the better choice.

The lesson is simple: when a word feels difficult to spell, breaking it into meaningful parts can be more effective than repeatedly memorizing the whole word.

How to Remember the Spelling of Tomorrow

If you regularly write tommorow, use one of these simple techniques.

Use the “One M, Two R’s” Rule

The easiest rule is:

Tomorrow = one M, two R’s.

Visualize the middle:

M O R R

Not:

M M O R

Connect It to “Morrow”

Remember:

TO + MORROW = TOMORROW

Since morrow has one m, you do not need to add another one.

Write It in Chunks

Instead of memorizing:

T-O-M-O-R-R-O-W

Try:

TO + MORROW

This makes the spelling pattern easier to recognize.

Use It in Sentences

Writing the correct form several times can reinforce the pattern:

• I will go tomorrow.
• See you tomorrow.
• Tomorrow will be busy.
• We have a test tomorrow.

The goal is not to repeat the word mindlessly. It is to become familiar with its correct visual pattern.

Tomorrow vs Tommorow: Quick Checklist

Before publishing an email, assignment, article, or social post, use this checklist:

• Is the word spelled tomorrow?
• Does it have only one M?
• Does it have two R’s?
• Did you avoid tommorow?
• Did you avoid tomorow?
• Did you avoid tommorrow?
• If using a possessive form, did you write tomorrow’s?

The Fastest Way to Check

If you are unsure, simply remember:

TOM + ORROW = TOMORROW

Or even shorter:

One M, two R’s.

FAQs

Q1: Is “tommorow” correct?

A: No. Tommorow is a misspelling. The correct spelling is tomorrow, with one m and two r’s. Merriam-Webster lists tommorow among common misspellings.

Q2: Is it “tomorrow” or “tommorow”?

A: The correct spelling is tomorrow.

✅ tomorrow
❌ tommorow

The incorrect version adds an unnecessary second m.

Q3: Does tomorrow have one M or two M’s?

A: Tomorrow has one M.

The correct spelling is:

T-O-M-O-R-R-O-W

So, it has one M and two R’s.

Q4: Does tomorrow have one R or two R’s?

A: Tomorrow has two R’s.

The middle of the word is:

ORR

not OR.

Q5: Why do people spell tomorrow as “tommorow”?

A: The error probably comes from the word’s pronunciation and visual pattern. Writers may unconsciously add another m or omit one of the r’s. Breaking the word into to + morrow can make its spelling easier to remember.

Q6: What is the correct plural or possessive form of tomorrow?

A: Tomorrow is generally used as an uncountable noun when referring to the day after today, so you normally do not need a plural form. For possession or association, use tomorrow’s:

Tomorrow’s meeting starts at 9 a.m.

Q7: Is “tomorrow” used in both American and British English?

A: Yes. Tomorrow is standard in both American and British English. Cambridge provides both UK and US pronunciations while retaining the same spelling.

Q8: Is “tomorrow” one word or two words?

A: Tomorrow is one word.

Correct:

See you tomorrow.

Incorrect:

See you to morrow.

The modern standard spelling is the single word tomorrow.

Final Answer:

If you are wondering “tomorrow vs tommorow: which spelling is correct?”, the answer is clear:

✅ Tomorrow — correct
❌ Tommorow — incorrect

The easiest rule to remember is one M and two R’s:

T-O-M-O-R-R-O-W

You can also remember the historical word morrow:

TO + MORROW = TOMORROW

So the next time you need to write about the day after today, choose tomorrow with confidence.

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