Let me settle the argument right at the top: both are correct.
If you say tomayto, you’re right. If you say tomahto, you’re also right. Nobody is winning this one, because there is no wrong answer. It’s just two accents landing on the same word.
But that’s the boring part. The fun part is why one little vegetable ended up with two pronunciations while its best friend, the potato, only ever gets said one way.
Here’s the whole story.
The quick version
Tomayto is the American way. Tomahto is the modern British way.
You’ll also hear tomahto in places that picked up British English, like Australia and parts of Ireland. Canada is a bit of a mix.
That’s really all you need if you just came for the answer. Say it however feels natural. Stick around if you want the reason, because it’s genuinely a good one.
Where the word even comes from
The tomato didn’t start in Europe, and neither did its name.
It came from the Aztec word tomatl. Spanish explorers turned that into tomate when the tomato started out in Mexico and made its way across the ocean. English speakers then borrowed tomate and shaped it into “tomato.”
Here’s the key detail: English picked up the word pretty late, somewhere around the mid-1700s. That timing matters more than you’d think.
Why the pronunciation split in two
English went through a huge sound change called the Great Vowel Shift. It ran for about 300 years, roughly from the 1400s to the 1700s. During that stretch, the way English speakers said their vowels slowly changed across the board.
Tomato showed up too late to catch the main event. By the mid-1700s that big shift was basically done.
But something smaller happened after. Around 18th-century London, a mini shift pushed certain “a” sounds toward a broader “ah.” That’s the change that gave Britain “tomahto.”
America had already split off by then. So American English never picked up that London “ah.” It kept the flatter “ay” sound instead.
Two branches of the same language. One caught a late vowel change, the other didn’t. That’s the split.
So why isn’t it potayto and potahto?
This is my favorite part, because it exposes the whole thing.
Potato came into English earlier than tomato, back in the 1500s. That means potato was around for the Great Vowel Shift. It rode the wave with every other English word and came out the other side as “potayto” for everyone.
By the time that little London “ah” shift happened later on, potato was already locked in. It didn’t get pulled along.
Tomato, arriving a couple centuries after potato, missed the big shift but caught the small one. Potato caught the big one and skipped the small one.
Same rhyme, totally different timing. That’s why “potahto” isn’t a real thing anyone says.
Which makes one famous song kind of a cheat.
The song that made it famous
If this whole debate rings a bell, it’s probably because of the Gershwins.
Back in 1937, George and Ira Gershwin wrote “Let’s Call the Whole Thing Off.” Fred Astaire and Ginger Rogers sang it. The lyric goes, “You say tomayto, I say tomahto,” and then it does the same with potato: “You say potayto, I say potahto.”
Except, like I just explained, nobody actually says potahto. The songwriters made that one up so it would rhyme.
So the song that taught the world about tomayto and tomahto also quietly invented a pronunciation to match. I think that’s hilarious.
Is one of them fancier?
A little, and only because of history.
After the American Revolution, saying tomayto turned into a small badge of being American, a way of not sounding British on purpose. Meanwhile tomahto picked up a slightly posh, proper reputation in some ears.
You’ll still see this today. An American who says tomahto sometimes gets teased for sounding fussy. A Brit who says tomayto might get a funny look. None of it means anything. It’s just habit and accent.
If it were me, I wouldn’t overthink it. Say the version your family says. That’s the one that’s “right” for you.
The bottom line
Tomayto and tomahto are the same word wearing two different accents. American English kept an older, flatter vowel. British English later slid toward “ah.” Potato dodged the split because it arrived on the scene a couple hundred years sooner.
Funny how one tiny fruit can carry that much history. And yes, I said fruit, which opens a whole other can of worms. If you’ve ever gotten stuck in the fruit-or-vegetable fight, that one has a surprisingly clear winner. And if it’s the spelling rather than the sound that trips you up, we settled tomatoes vs tomatos too.
Curious about the rest? We dig into other tomato questions we get asked a lot over in the Common Questions section.