If you have ever typed “skiis” and then stopped to wonder whether it looks right, you are not alone. The spelling can be confusing because the word ski already ends in i, while related forms such as skiing contain two consecutive i’s.
So, is it skis or skiis?
The answer is simple: skis is correct, while skiis is a misspelling in standard English. Major dictionaries, including Cambridge and Oxford, list skis as the plural of ski.
In this guide, you will learn why skis is correct, why people sometimes write skiis, how to use the word in sentences, and how to remember the spelling permanently.
Skis or Skiis: Which Spelling Is Correct?
Skis is the correct spelling
Skis is the standard plural form of ski.
The rule is straightforward:
ski + s = skis
When you are talking about more than one ski, use skis.
For example:
- I bought a new ski.
- I bought two skis.
- She left her skis beside the door.
- The instructor checked everyone’s skis.
- We rented skis at the resort.
Cambridge Dictionary specifically gives skis as the plural form of ski, while Oxford Advanced Learner’s Dictionary also lists skis as the plural.
Is “skiis” correct?
No. Skiis is not the standard plural spelling of ski.
The extra i is unnecessary.
Compare:
| Form | Correct? | Meaning |
|---|---|---|
| ski | ✅ Yes | One ski / base verb |
| skis | ✅ Yes | More than one ski / third-person verb |
| skiing | ✅ Yes | The activity or present participle |
| skied | ✅ Yes | Past tense and past participle |
| skiis | ❌ No | Common misspelling |
Therefore, if you are writing a school assignment, article, product description, travel guide, or professional message, choose skis, not skiis.
The easiest rule to remember
Think of the word as:
One ski → two skis
You simply add s.
There is no need to insert another i.
Why Is “Skis” Spelled With One I?
English simply adds “-s”
The main reason is grammatical rather than complicated.
Ski is a countable noun. Its ordinary plural is formed by adding -s:
- ski → skis
- car → cars
- book → books
- chair → chairs
- shoe → shoes
Although ski ends in the letter i, that does not mean English needs to duplicate the vowel before adding the plural ending.
So:
ski + s = skis
not:
ski + is = skiis
This is why the spelling remains short.
Why people add the extra “i”
The mistake is understandable.
One reason is that English contains the related word skiing, which really does contain two consecutive i’s:
ski + ing = skiing
A writer who has recently seen or written skiing may accidentally transfer that spelling pattern to the plural noun.
For example:
- Correct: skiing
- Correct: skis
- Incorrect: skiis
The two words look similar at first glance, but they are formed differently.
The word’s history does not change the modern spelling
The word ski entered English from Norwegian and ultimately traces back to Old Norse. Oxford gives the word origin as Norwegian, from Old Norse skíth, referring to a billet or snowshoe.
However, you do not need to understand the historical origin to spell the modern plural correctly.
Modern English uses:
ski → skis
That is the form you should use in contemporary writing.
How to Use “Skis” Correctly
“Skis” as a plural noun
The most common use of skis is as the plural of ski.
A ski is one piece of equipment used for moving across snow. When you mean more than one, use skis.
Examples:
- My skis are in the garage.
- We packed our skis before leaving.
- The rental shop has hundreds of skis.
- Her skis are too long for her.
- The children carried their skis to the lift.
- His new skis performed well on the powder.
Notice that the spelling never becomes skiis.
“Skis” can also be a verb
There is another interesting point: skis is not only a plural noun.
It can also be the third-person singular present form of the verb ski.
For example:
Maria skis every winter.
Here, skis is a verb, not a noun.
Compare the following forms:
| Verb form | Example |
|---|---|
| ski | I ski every winter. |
| skis | She skis every winter. |
| skiing | They are skiing today. |
| skied | We skied yesterday. |
Dictionary sources also list skis as the present-tense third-person singular form of ski.
“Skiing” is different from “skis”
This distinction explains a lot of the spelling confusion.
Skiing means the activity of moving over snow on skis, or it functions as the present participle of ski. Cambridge lists skiing separately from the plural noun skis.
Examples:
- Skiing is popular in the mountains.
- We are skiing this weekend.
- She bought new skis.
- His skis are in the car.
The double i belongs in skiing, but not in skis.
Skis vs. Skiis: Common Mistakes and Easy Fixes
Common spelling mistakes
Here are some mistakes you may encounter:
❌ I packed my skiis for the trip.
✅ I packed my skis for the trip.
❌ The shop sells professional skiis.
✅ The shop sells professional skis.
❌ Her skiis were covered in snow.
✅ Her skis were covered in snow.
❌ We need to rent two pairs of skiis.
✅ We need to rent two pairs of skis.
The incorrect form often looks plausible because the writer expects the second i to behave like the one in skiing. But standard English does not use that pattern for the plural noun.
Don’t confuse “skis” with “skies”
Another spelling that can cause confusion is skies.
Although skis and skies sound similar, they have completely different meanings.
Skis = plural of ski
My skis are ready.
Skies = plural of sky
The evening skies were bright orange.
This distinction is especially important when writing about weather and winter sports.
Consider:
The skies above the mountain were cloudy, so we packed our skis away.
Both words are correct, but they refer to completely different things.
Don’t use “ski’s” for the plural
Another common mistake is adding an apostrophe:
❌ ski’s
For an ordinary plural, the correct form is:
✅ skis
An apostrophe normally indicates possession or a contraction, not a regular plural.
For example:
The ski’s edge was damaged.
This can mean the edge belonging to one ski, although the ski’s edge is clearer.
But:
We cleaned the skis.
Here, skis simply means more than one ski.
A Simple Guide to Ski, Skis, Skiing, and Skied
The four forms you should know
If you want to avoid spelling mistakes, it helps to learn the common forms together.
| Word | Function | Example |
|---|---|---|
| ski | Singular noun / base verb | I bought one ski. |
| skis | Plural noun / third-person verb | She skis every winter. |
| skiing | Activity / present participle | We enjoy skiing. |
| skied | Past tense / past participle | They skied yesterday. |
This table makes one important point clear: skiis does not belong in the standard word family.
A quick memory trick
Use this simple formula:
One ski → two skis → skiing → skied
If you remember those four forms together, it becomes much easier to avoid the extra i.
You can also remember:
The plural gets S, not another I.
So when you see more than one:
ski → skis
Step-by-step spelling check
When you are unsure, use this three-step check:
- Start with the singular: ski
- Ask whether you mean more than one: yes
- Add -s: skis
That’s all you need.
For example:
I have one ski.
Becomes:
I have two skis.
Not:
I have two skiis.
Real-Life Example: Why Correct Spelling Matters
Imagine a ski rental business preparing its website for the winter season. The business wants to advertise equipment for beginners and experienced visitors.
Its original product page says:
“Rent high-quality skiis for your next mountain adventure.”
A visitor may understand the meaning immediately, but the spelling still looks unprofessional. A corrected version would say:
“Rent high-quality skis for your next mountain adventure.”
The difference is only one letter, yet the second version looks cleaner and more trustworthy.
This matters because words on websites are part of a company’s public presentation. A spelling error in a product listing, travel article, resort brochure, school assignment, or promotional email can make the writing appear less carefully edited.
Now imagine a student writing:
“The athletes placed their skiis beside the slope.”
A teacher familiar with English spelling would expect:
“The athletes placed their skis beside the slope.”
The meaning has not changed, but the corrected version follows standard English usage.
The same principle applies to everyday communication. If you are writing about a winter vacation, you might say:
“We packed our skis, ski boots, helmets, and goggles before leaving for the resort.”
Every form in that sentence is natural and correctly spelled.
The lesson is simple: small spelling decisions can influence how polished your writing appears. Using skis consistently is an easy way to make your writing more accurate.
What Current Data Says About Skiing and “Skis”
Recent participation data
The spelling question is linguistic, but the word itself belongs to a very active sports vocabulary.
The National Ski Areas Association reported that the 2024–25 U.S. ski season produced 61.5 million skier visits, making it the second-highest season on record at that time. The association’s industry statistics track skier and snowboarder visits and participant information.
More recent 2025–26 data shows how much conditions can affect the industry. Preliminary figures reported by NSAA in May 2026 estimated 52.6 million snowsports visits for the 2025–26 season, with the final figure later updated by the association.
What these numbers mean
A skier visit is not necessarily one unique skier. The industry commonly counts visits based on people using a ski area’s facilities, so one person visiting several times can contribute multiple visits.
This distinction is useful when reading skiing statistics. Participation numbers, skier visits, and individual skiers are not interchangeable.
The broader point is that skiing remains a significant winter-sports activity, which means words such as ski, skis, skiing, skier, and ski resort continue to appear frequently in travel, sports, retail, and recreational writing.
Why accurate spelling still matters in 2026
With skiing content appearing in:
- Travel websites
- Resort websites
- Equipment stores
- Sports journalism
- School assignments
- Social media
- Product descriptions
- Tourism brochures
- Instructional material
there are plenty of situations where writers need to use the word correctly.
Recent dictionary entries continue to recognize skis as the standard plural form. Cambridge and Oxford both explicitly list it.
Skis in American and British English
Is “skis” used in both varieties?
Yes.
Skis is the standard plural spelling in both American and British English.
You do not need to change the spelling depending on whether you are writing for a U.S. or U.K. audience.
For example:
American English:
The skier waxed his skis before the race.
British English:
The skier waxed his skis before the race.
The spelling remains skis.
What about pronunciation?
The word ski is generally pronounced /skiː/, and the plural skis adds the normal plural sound.
The spelling does not require another written i simply because the ending may sound like a separate syllable or because related words contain two i’s.
The important distinction is between pronunciation and spelling. A sound pattern does not automatically tell you to duplicate a letter.
International use
The word ski is widely used in English-language writing about winter sports. Dictionaries such as Cambridge and Oxford treat it as an established English word and give skis as its plural.
Therefore, whether you are writing for readers in the United States, United Kingdom, Canada, Australia, or elsewhere, skis is the safe standard form.
Mini Quiz:Skis or Skiis
1. Which spelling is correct?
A) Skiis
B) Skis
C) Skies
D) Ski’s
Answer: B) Skis
2. What is the plural of “ski”?
A) Skiis
B) Skies
C) Skis
D) Ski’s
Answer: C) Skis
3. Which sentence is correct?
A) I bought two skiis.
B) I bought two skis.
C) I bought two skies.
D) I bought two ski’s.
Answer: B) I bought two skis.
4. Is “skiis” the standard spelling?
A) Yes
B) No
Answer: B) No
5. Complete the sentence: “My ___ are in the garage.”
A) skiis
B) skies
C) skis
D) ski’s
Answer: C) skis
6. Which word means more than one ski?
A) Ski
B) Skis
C) Skiing
D) Skied
Answer: B) Skis
7. Which spelling is correct for the activity?
A) Skiis
B) Skis
C) Skiing
D) Skiingg
Answer: C) Skiing
8. Which sentence is correct?
A) She skiis every winter.
B) She skis every winter.
C) She skies every winter.
D) She ski’s every winter.
Answer: B) She skis every winter.
9. What is wrong with “skiis”?
A) It has an unnecessary second i.
B) It needs an apostrophe.
C) It needs an e.
D) Nothing is wrong with it.
Answer: A) It has an unnecessary second i.
10. Which is the correct plural?
A) Ski’s
B) Skiis
C) Skies
D) Skis
Answer: D) Skis
11. Complete the sentence: “We rented two pairs of ___.”
A) skiis
B) skis
C) skies
D) ski’s
Answer: B) skis
12. Which word is the plural of “sky”?
A) Skis
B) Skiis
C) Skies
D) Ski’s
Answer: C) Skies
13. Which sentence uses “skies” correctly?
A) I packed my skies for skiing.
B) The evening skies were beautiful.
C) My skies are in the ski shop.
D) She waxed her skies.
Answer: B) The evening skies were beautiful.
14. Which sentence uses “skis” correctly?
A) The skies are beside the door.
B) I left my skis at the resort.
C) The skiis are new.
D) I bought three ski’s.
Answer: B) I left my skis at the resort.
15. Is this sentence correct? “He bought new skis.”
A) Yes
B) No
Answer: A) Yes
16. Is this sentence correct? “He bought new skiis.”
A) Yes
B) No
Answer: B) No
17. Which form is the past tense of “ski”?
A) Skis
B) Skiing
C) Skied
D) Skiis
Answer: C) Skied
18. Which sentence is correctly spelled?
A) They skied yesterday.
B) They skiied yesterday.
C) They skiis yesterday.
D) They skies yesterday.
Answer: A) They skied yesterday.
19. Why do some people mistakenly write “skiis”?
A) Because “skiing” contains two i’s.
B) Because “ski” has two syllables.
C) Because all plurals need two vowels.
D) Because “skies” is another spelling of “skis.”
Answer: A) Because “skiing” contains two i’s.
20. Which rule correctly forms the plural of “ski”?
A) Add -is
B) Add -ies
C) Add -s
D) Add an apostrophe
Answer: C) Add -s
21. Complete the sentence: “The children carried their ___ to the lift.”
A) skiis
B) skis
C) skies
D) ski’s
Answer: B) skis
22. Which word can be both a plural noun and a verb?
A) Skis
B) Skiing
C) Skied
D) Skiis
Answer: A) Skis
23. Which sentence correctly uses “skis” as a verb?
A) Maria skis every weekend.
B) Maria skiis every weekend.
C) Maria skies every weekend.
D) Maria ski’s every weekend.
Answer: A) Maria skis every weekend.
24. Which sentence is completely correct?
A) We packed our skis before skiing.
B) We packed our skiis before skiing.
C) We packed our skis before skiied.
D) We packed our ski’s before skiing.
Answer: A) We packed our skis before skiing.
25. What is the easiest way to remember the correct spelling?
A) One ski, two skiis
B) One ski, two skies
C) One ski, two skis
D) One ski, two ski’s
Answer: C) One ski, two skis
Frequently Asked Questions About Skis or Skiis
Q1:Is “skiis” a correct spelling?
No. Skiis is a misspelling in standard English. The correct plural of ski is skis. Cambridge and Oxford both list skis as the plural form.
Q2:What is the plural of “ski”?
The plural is skis.
One ski → two skis
For example:
We put our skis in the car.
Q3:Why isn’t it spelled “skiis”?
Because the plural is formed by adding -s to ski.
The correct formation is:
ski + s = skis
There is no need to add another i.
Q4:Is “skis” also a verb?
Yes. Skis can be the third-person singular present form of the verb ski.
For example:
James skis every weekend.
Dictionary.com lists skis as the present-tense third-person singular form of ski.
Q5:What is the difference between “skis” and “skies”?
Skis is the plural of ski:
Her skis are new.
Skies is the plural of sky:
The skies were clear.
The two words sound similar but have different meanings and spellings.
Q6:Is “ski’s” the plural of “ski”?
No.
Ski’s usually indicates possession involving one ski or can appear in certain constructions where an apostrophe is grammatically required. It is not the ordinary plural.
For more than one ski, write:
skis
Q7:Is “skis” correct in American English?
Yes. Skis is standard in American English.
It is also standard in British English, so there is no American-versus-British spelling difference here.
Q8:How can I remember the correct spelling?
Use the simplest rule:
One ski, two skis.
Add s, not another i.
If you remember ski → skis, you will avoid the common skiis error.
Quick Reference Checklist
Before publishing or submitting your writing, check the following:
- ✅ ski = one
- ✅ skis = more than one
- ✅ skiing = the activity / present participle
- ✅ skied = past tense
- ❌ skiis = misspelling
- ❌ ski’s = not the normal plural
- ✅ skies = plural of sky
Examples to remember
Correct:
I bought new skis.
Incorrect:
I bought new skiis.
Correct:
She skis every winter.
Incorrect:
She skiis every winter.
Correct:
We went skiing yesterday.
Incorrect:
We went skiis yesterday.
Final Conclusion: Skis or Skiis?
When choosing between skis or skiis, there is a clear winner: skis.
Skis is the correct standard spelling for the plural of ski. Major dictionaries, including Cambridge and Oxford, confirm this form.
The rule is simple:
ski → skis
You do not need to add another i.
Remember that skiing is correctly spelled with two i’s, which may explain why skiis sometimes looks tempting. However, these are different forms with different endings.
So the next time you write about winter sports, ski equipment, or a mountain adventure, remember:
One ski, two skis.
Using the correct spelling makes your writing clearer, more professional, and easier to trust.
Explore more easy grammar lessons and improve your English with Grammar Expertise
References
Cambridge Dictionary — Ski
Cambridge Grammar — Spelling and Plurals
Maimoona Mughal is an English grammar enthusiast dedicated to simplifying confusing words, grammar rules, and vocabulary through clear, accurate, and learner-friendly content that helps readers write and communicate with confidence.
