Before anything else, remember this simple rule: "tomorrow" is always correct, while "tommorrow" is always a misspelling. It seems like a tiny mistake, but it's one that catches millions of English speakers every day. Because "tomorrow" is such a common word, even experienced writers occasionally hesitate, wondering if it needs two ms or two rs. The answer is straightforward: one m, two rs.
Tomorrow or Tommorrow? The One-Letter Mistake Everyone Makes
Some words are surprisingly difficult to spell, not because they're long or complicated, but because they're so familiar. "Tomorrow" is a perfect example. You probably use it in emails, text messages, work documents, and everyday conversations without thinking twice. Yet when it's time to type it, many people instinctively add an extra m, producing "tommorrow."
Although it's a common mistake, it has never been an accepted spelling. Whether you're writing formally or casually, tomorrow is the only correct version.
The Correct Spelling
Let's settle the confusion once and for all:
Tomorrow
Tommorrow
Tomorow
Tommorow
Tomarrow
English dictionaries recognize only tomorrow. There are no American or British variations, and no informal spelling that changes the word.
Because the word appears so frequently in everyday writing, spelling it correctly helps your writing look more polished and professional.
How "Tomorrow" Works in a Sentence
One reason the spelling can feel confusing is that the word serves more than one grammatical purpose.
As a noun:
Tomorrow will be a busy day.
I'm looking forward to tomorrow.
As an adverb:
I'll call you tomorrow.
We're leaving tomorrow morning.
Although its function changes, the spelling never does.
Why So Many People Write "Tommorrow"
The mistake usually happens because of pronunciation.
When people say the word aloud, the middle sound receives noticeable emphasis. That often tricks the brain into believing the m should be doubled. English contains many words with double consonants, so our brains naturally try to apply those familiar spelling patterns.
Fast typing also contributes to the problem. Since many people type quickly without consciously thinking about each letter, it's easy to repeat the m by accident before noticing the error.
The result is one of the most common spelling mistakes in English.
The History Behind the Word
Understanding where the word comes from makes its spelling much easier to remember.
"Tomorrow" developed from two older English words:
to
morrow
The first part contributes the single m, while morrow already contains the double r. Over centuries, the two words gradually merged into the single word we use today.
The word morrow once meant "the following morning" or "the next day." Although it rarely appears in modern conversation, it survives in older expressions like "good morrow."
Knowing this history explains why the word contains only one m but keeps both rs.
Easy Ways to Remember the Correct Spelling
Instead of trying to memorize the entire word, break it into smaller parts.
Think of it as:
to + morrow
This simple division makes the letter pattern much easier to remember.
Another useful trick is to compare it with familiar words such as:
sorrow
borrow
They all share the same -orrow ending with two rs.
You can also practice writing complete sentences rather than memorizing the word by itself. Repetition in real writing helps build lasting muscle memory.
Why Correct Spelling Matters
Some people dismiss spelling mistakes as minor errors, but common words receive more attention than uncommon ones.
Misspelling "tomorrow" in:
professional emails,
school assignments,
resumes,
reports,
blog posts,
can create an impression of carelessness, even when the mistake is accidental.
Fortunately, this is one error that's easy to eliminate once you recognize the correct pattern.
Don't Depend Entirely on Spell Check
Modern writing tools often detect "tommorrow," but they're not perfect.
Autocorrect may occasionally miss mistakes depending on the application you're using, and some text fields provide little or no spelling support. That's why it's helpful to proofread important documents instead of relying entirely on software.
The better you know the correct spelling yourself, the less you'll depend on technology to catch simple mistakes.
Final Thoughts
The confusion between tomorrow and tommorrow comes from pronunciation, typing habits, and familiar English spelling patterns. However, there is only one correct spelling: tomorrow.
Remember the word's history—to + morrow—and you'll naturally remember that it contains one m and two rs. After a little practice, the correct spelling becomes automatic, and you'll never have to stop and wonder whether you've added one letter too many.