You’re typing a message about your weekend plans. You reach the word for the gear on your feet, and you stop. One i or two? Autocorrect stays quiet, so you can’t be sure.
That small doubt is common, and it’s easy to understand. This guide settles skis or skiis in seconds. Then it covers the meaning, the origin, and the slips worth avoiding. You’ll also get real examples and a memory trick that sticks.
Skis or Skiis — Quick Answer
Skis is the correct spelling. It’s the plural of ski. One ski, two skis.
Skiis is a misspelling. Dictionaries treat it as a mistake, not a variant.
The rule: ski + s = skis. The second i belongs to skiing, not to the plural.
What Is “Skis”?
Skis are the long, narrow runners you attach to your boots to glide over snow. Merriam-Webster describes a ski as one of a pair of narrow strips of wood, metal, or plastic that curve up at the front. The word also covers the boards used in water skiing.
Merriam-Webster lists a second sense too. It’s a piece of material that works like a ski and serves as a runner on a vehicle. That’s why you’ll also hear about jet skis. In every case, the plural stays the same.
Skis is the plural noun. It follows the plainest rule in English: add an -s. Nothing doubles, and no extra vowel appears. Merriam-Webster and Oxford Learner’s Dictionaries both list the plural as skis.
Correct Usage Examples
- She waxed her skis before the first lift opened.
- Cross-country skis are narrower than downhill ones.
- We left our skis by the cabin door.
- He’s saving up for a new pair of powder skis.
- Water skis sit flat on the surface, not on snow.
Every sentence ends the word with a single s and keeps one i in the middle. That’s the whole pattern. Read them aloud once, and the shape of the word starts to feel natural.
Ski, Skis, Skied, Skiing: The Whole Word Family
Most spelling trouble around this word comes from its relatives. Here they are side by side.
| Form | What it is | Example |
| ski | Noun (one) or verb (base form) | “I ski every winter.” |
| skis | Noun (plural) or verb (he, she, it) | “She skis on Sundays.” |
| skied | Verb (past tense) | “We skied all morning.” |
| skiing | Verb (-ing form) or the sport | “Skiing is her favorite sport.” |
Only one of these has two i‘s: skiing. That’s worth remembering.
The verb form can trip people up too. “He skis” looks like the plural noun, but here it’s the third-person verb. It still takes just one s.
Is ski a sport? Not quite. The sport is called skiing. Ski names the gear and the action.
Can “Ski” Stay the Same in the Plural?
Sometimes. Merriam-Webster lists ski as an also-accepted plural. You might spot “a pair of ski” in older or specialist writing.
Still, skis is the standard choice and the safest one. So your two options are skis or, rarely, ski. A plural with two i‘s isn’t on the list.
What Is “Skiis”?
Skiis isn’t a word. Wiktionary and YourDictionary both label it a misspelling of skis. It has no meaning of its own.
The error sits one letter away from the right answer. That makes it easy to miss when you reread. Your eyes see ski, and your brain fills in the rest.
So when writers ask about skis or skiis, the answer never changes. The extra i is an easy slip. It’s still a slip.
Where You’ll See “Skiis” (Incorrectly)
You’ll mostly meet it in quick, unedited writing:
- Text messages and chat replies
- Fast social media captions
- Hurried product listings
- Forum threads and comment sections
- Handwritten notes and sign-up sheets
Usually it’s a typing slip, not a different word. A quick proofread catches it.
Why does it survive? Casual writing rarely gets a second read. Also, people copy what they see. If a friend’s caption says skiis, it can start to look normal. Seeing a mistake often doesn’t make it correct. It only makes it familiar.
Skis or Skiis — The Origin of the Confusion
The skis or skiis mix-up has a clear cause. It starts with how the word is built and where it came from.
The Word Comes from Old Norse
Ski entered English from Norwegian. Norwegian took it from Old Norse skíth, a word for a stick or billet of wood. Oxford dates the English use to the mid-18th century.
English kept the Norwegian spelling but changed the sound. We say “skee,” as in “sea.” Once the word settled in, English treated it like any other noun. It simply took an -s.
Some reference sources note that Norwegian still uses related words for split wood. That fits the original “stick of wood” idea. In English, the meaning narrowed to one very particular stick: the one you glide on.
Why People Add an Extra “I”
Three habits push writers toward skiis.
1. The word skiing. It has two i‘s. The first comes from ski. The second comes from the -ing ending. Your brain carries that double letter over to the plural.
2. A double-tap. Fingers sometimes press a key twice. On a small phone screen, the i is an easy letter to repeat.
3. A vowel ending that feels odd. Words ending in i can look like they need special handling. They don’t. Taxi becomes taxis. Bikini becomes bikinis. Kiwi becomes kiwis. Ski works the same way.
None of these habits comes from a real rule. They’re just patterns your brain borrows. Once you see where the pull comes from, it loses its grip.
How Do You Pronounce Skis?
Say ski so it rhymes with “sea.” For skis, add a “z” sound at the end, so it sounds like “skeez.” Oxford Learner’s Dictionaries shows the plural with that final “z.”
Merriam-Webster also notes that British speakers sometimes say “shee” for ski. That’s a pronunciation note, not a spelling one.
Here’s the catch. Pronunciation can’t settle skis or skiis, because the “z” sound is spelled with an s. Don’t let your ears talk you into a second i.
British English vs American English Spelling
Is this a regional split, like colour and color? No. British and American writers both use skis. Neither side uses skiis.
Comparison Table: British vs American English
| Feature | British English | American English |
| Plural of ski | skis | skis |
| “Skiis” accepted? | No | No |
| Spoken sound | Usually “skee,” sometimes “shee” | “skee” |
Which Spelling Should You Use?
Use skis. That’s true in a text to a friend, a school essay, or a shop listing.
When you’re weighing skis or skiis, remember that the choice is already made. One of them is a word. The other is a typo.
The only time an odd spelling is fine is in a brand name or username that someone chose on purpose. In your own writing, use skis.
Skis vs Skiis: Full Comparison Table
| Feature | Skis ✅ | Skiis ❌ |
| Correct plural of ski | Yes | No |
| Pattern | Regular: ski + s | Adds a letter the rule doesn’t need |
| Dictionary status | Standard plural | Labeled a misspelling |
| Fits formal writing | Yes | No |
| Fits casual writing | Yes | Reads as a typo |
| British and American use | Both | Neither |
An Easy Memory Trick
Let the ending decide the letter. Check what you’re adding to ski, then add only that.
- ski + ing = skiing (the second i comes from -ing)
- ski + ed = skied (the ending is -ed, so no extra i)
- ski + s = skis (the ending is just -s)
Plural means adding an -s. It never means adding another i. Here’s a rhyme you can hum on the lift: one ski, two skis, no extra i’s, please.
Next time you hesitate over skis or skiis, ask one question. What’s the ending? If it’s -s, you’re done.
Try it on these four. Pick the right form:
- She packed her (skis / skiis) in the trunk.
- Last winter, we (skied / skiied) every weekend.
- The (ski / skis) lift opens at nine.
- Two (skis / ski’s) leaned against the wall.
The answers are skis, skied, ski, and skis.
Common Mistakes with Skis or Skiis
Picture a rental counter on a busy Saturday. The sign reads “Skiis for rent, ski’s repaired.” That’s two slips in five words. Mistakes like to travel in groups, so here are the ones to watch.
Writing “Skiis” in a Plural Sentence
Wrong: We rented two pairs of skiis. Right: We rented two pairs of skis.
Notice that “pairs” already shows the plural. The word itself still stays skis.
Writing “Ski’s” for the Plural
An apostrophe signals ownership, not quantity.
- One ski, possessive: the ski’s tip
- Plural: two skis
- Plural, possessive: the skis’ edges
Wrong: She packed two ski’s. Right: She packed two skis.
Mixing Up “Skis” and “Skies”
Skies is the plural of sky. It rhymes with “eyes.” Skis rhymes with “keys.”
Wrong: I bought new skies for the trip. Right: I bought new skis for the trip.
Autocorrect can swap these two. Reread any sentence about snow gear before you hit send.
Writing “Skiied” Instead of “Skied”
The past tense of ski is skied. Merriam-Webster and Oxford both list it that way. The doubled i belongs only to the -ing form.
Wrong: We skiied the north slope. Right: We skied the north slope.
Using “Skis” Before Another Noun
When ski describes another noun, it stays singular. Oxford’s own examples include ski resort, ski boots, and ski mask.
Wrong: The skis resort opens Friday. Right: The ski resort opens Friday.
Use skis only when the gear itself is the subject. For example: “The skis are in the car.”
Skis or Skiis in Everyday Examples
Seeing the right spelling in real settings helps it stick. Here’s how skis looks in four common situations.
Emails
Write: “Please leave your skis in the rental shed by Friday evening.” Avoid: “Please leave your skiis in the rental shed by Friday evening.”
Write: “I’ve booked a tuning appointment for my skis on Tuesday.” Avoid: “I’ve booked a tuning appointment for my skiis on Tuesday.”
Email feels casual, but colleagues and clients still notice the slip.
News Writing
Write: “Race crews checked every pair of skis before the start.” Avoid: “Race crews checked every pair of skiis before the start.”
Write: “Volunteers carried hundreds of skis down to the lodge after the road closed.”
Editors catch skiis fast. It’s one of the first things a proofread removes.
Social Media
Write: “First day on my new skis. Wish me luck! 🎿” Avoid: “First day on my new skiis. Wish me luck! 🎿”
Write: “Fresh snow, warm gloves, and my favorite skis.”
Captions feel throwaway, yet they’re public. A tiny typo can overshadow a great photo.
Hashtags are even less forgiving. A tag spelled #skiis is a different string from #skis, so it won’t land with the posts you meant to join.
Formal Writing
Write: “Participants must bring their own skis, boots, and poles.” Avoid: “Participants must bring their own skiis, boots, and poles.”
Write: “All rental skis must be returned by 5 p.m. on the final day.”
In reports, rules, and applications, a misspelling can weaken an otherwise careful document.
Skis or Skiis — Google Trends & Usage Data
You don’t need a chart to settle this one. The reference books already agree. Merriam-Webster and Oxford Learner’s Dictionaries both list skis as the plural. Wiktionary and YourDictionary list skiis only to flag it as a misspelling.
Spellcheck tells the same story. Most tools underline skiis and suggest skis, although results can vary by app and device.
Want to see how people search for skis or skiis? Type both into Google Trends and compare the two lines yourself. Just remember that popularity doesn’t make a spelling correct. Plenty of misspellings get typed often.
Here are three checks you can run in under a minute:
- Look up ski in a dictionary and read the plural line.
- Type skiis into any spellchecker and see what it suggests.
- Compare both spellings in Google Trends.
Comparison Table: Skis vs Skiis at a Glance
| Category | Skis | Skiis |
| Dictionary status | Standard plural (Merriam-Webster, Oxford Learner’s) | Labeled a misspelling (Wiktionary, YourDictionary) |
| Spellcheck | Accepted | Usually flagged |
| Edited writing | Appropriate | Avoid |
| Grammar pattern | Regular -s plural | No rule supports it |
| Related forms | skied, skiing | None |
Related Spelling Pairs
If skis or skiis tripped you up, these look-alike pairs might too:
- Monkeys or Monkies
- Separate or Seperate
- Cocoon or Cacoon
Frequently Asked Questions
Is “skiis” ever correct?
No. Skiis is a misspelling in every context. The correct plural is skis.
What is the plural of ski?
The plural is skis. Merriam-Webster also lists an unchanged plural, ski. Still, skis is the standard form, and it works everywhere.
What is the past tense of ski?
The past tense is skied, with one i before the d. Don’t write skiied. The doubled i appears only in skiing.
How do you pronounce skis?
Say “skeez.” It rhymes with “keys.” The ski part sounds like “sea,” and the final s sounds like a “z.”
What is an easy way to remember the spelling?
Let the ending decide the letter. The -ing ending gives skiing its second i. The plural ending is just -s, so you get skis. One ski, two skis.
Conclusion
The answer to skis or skiis is simple. Skis is correct, and skiis is a slip. Dictionaries list skis as the plural of ski, and nothing in English grammar asks for a second i.
So when your fingers hover over the keys, remember the ending. The -ing in skiing brings the extra i. The plural brings only an -s. Type skis, hit send, and head for the slopes.
And if the doubt ever returns, you now have a simple rule to lean on. One ski, two skis, and a second i only when skiing needs it.
