Have you ever typed “skiis” and wondered whether you added one letter too many? You are not alone. The correct plural spelling is skis, while skiis is a misspelling in standard English.
The word ski can be used as both a noun and a verb. When you are talking about more than one piece of equipment, the standard plural is skis. Major English dictionaries, including Cambridge Dictionary, list skis as the plural form of ski.
In this guide, you will learn why skis is correct, why skiis is incorrect, how to use the word in real sentences, and how to avoid this spelling mistake.
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Is “Skis” or “Skiis” Correct?
Skis is the correct spelling. Skiis is incorrect in standard English.
The singular form is ski, and its plural form is skis.
| Singular | Plural | Correct? |
|---|---|---|
| ski | skis | ✅ Yes |
| ski | skiis | ❌ No |
For example:
- I bought a new ski.
- I bought two new skis.
- The skis are ready for the mountain.
- She cleaned her skis after skiing.
Cambridge Dictionary specifically gives skis as the plural of ski.
Why “Skis” Is the Correct Form
The mistake usually happens because people think the final i should be doubled before adding -s.
However, English does not require doubling the final i in ski. Simply add -s:
ski + s = skis
Therefore:
One ski → two skis
Not:
One ski → two skiis
Is “Skiis” a Word?
In standard modern English, skiis is not the normal plural spelling of ski. If you are writing an article, school assignment, email, product description, or other formal text, use skis.
You may occasionally encounter unusual spellings online, but that does not make skiis the accepted standard plural.
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What Does “Ski” Mean?
A ski is a long, narrow piece of equipment designed to help a person move across snow. A skier generally uses a pair of skis attached to their boots.
Cambridge defines a ski as one of a pair of long, narrow pieces that are used to move over snow.
Ski as a Noun
As a noun, ski refers to the equipment itself.
Examples:
- I lost one ski on the slope.
- This ski is too long for me.
- He repaired his broken ski.
When there is more than one, use skis:
- I bought two new skis.
- Her skis are in the garage.
- The instructor checked our skis.
Ski as a Verb
Ski can also function as a verb meaning to move over snow using skis.
For example:
- I love to ski.
- They ski every winter.
- We skied down the mountain.
Notice that the verb forms are different from the plural noun:
Noun: ski → skis
Verb: ski → skis / skiing / skied
Cambridge also lists skis as the present-tense third-person singular form of the verb and skied as the past tense.
Skis or Skiis: The Simple Spelling Rule
If you remember only one thing from this article, remember this:
To make “ski” plural, add -s. Do not add another i.
The Correct Pattern
The spelling works like this:
ski + s = skis
There is no spelling change to the original word.
For example:
- ski → skis
- book → books
- chair → chairs
- mountain → mountains
The same basic plural idea applies: when the noun takes a regular plural -s, you add the ending directly.
Common Mistake: Doubling the “i”
People sometimes write skiis because the pronunciation can make the spelling feel unusual.
However, pronunciation is not a reason to insert another letter.
Compare:
Correct: skis
Incorrect: skiis
The correct spelling has only one i before the final s.
Easy Memory Trick
Think of the word as:
SKI + S = SKIS
If you can remember this short formula, you will rarely make the mistake again.
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Skis or Skiis in Real Sentences
Seeing the word in context makes the spelling rule easier to remember.
Correct Examples With “Skis”
Here are some natural examples:
- My skis are ready for the trip.
- She bought a new pair of skis.
- The children left their skis near the door.
- His skis are designed for deep snow.
- We carried our skis to the ski lift.
- The instructor checked everyone’s skis.
- These skis are lighter than my old pair.
All of these sentences use the standard plural spelling skis.
Incorrect Examples to Avoid
These sentences contain the common spelling mistake:
- ❌ I bought two skiis.
- ❌ Her skiis are in the car.
- ❌ The shop sells racing skiis.
Correct them by replacing skiis with skis:
- ✅ I bought two skis.
- ✅ Her skis are in the car.
- ✅ The shop sells racing skis.
A Quick Comparison
| Incorrect | Correct |
|---|---|
| skiis | skis |
| two skiis | two skis |
| pair of skiis | pair of skis |
| racing skiis | racing skis |
| new skiis | new skis |
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Why Does “Skiis” Look Like It Could Be Correct?
The spelling skiis can look logical at first glance, especially if you are not familiar with the word’s standard plural form.
The Double-Vowel Confusion
When people see ski, they may think that adding -s creates an awkward-looking ending:
ski + s → skis
Because the final i is already pronounced as a long vowel sound, some writers incorrectly add another i.
But English spelling does not work that way here.
The accepted form remains:
skis
Similar Spelling Questions
English contains many words whose plural forms do not look exactly how beginners might expect.
For example:
- key → keys
- boy → boys
- toy → toys
- day → days
- ski → skis
The important point is that ski does not need an extra letter before the plural ending.
Why the Correct Spelling Matters
Using skis rather than skiis helps your writing look accurate and professional.
This can matter when writing:
- Blog posts
- School assignments
- Product descriptions
- Travel guides
- Skiing articles
- Social media posts
- Emails
- Business content
A simple spelling mistake can make otherwise good writing look less polished.
Real-Life Example: A Beginner Choosing the Correct Spelling
Imagine that a beginner skier is preparing for a winter vacation. She writes a packing list on her phone:
“Jacket, gloves, boots, goggles, skiis.”
She pauses because skiis looks slightly strange. She checks an English dictionary and finds that the plural of ski is skis. She changes the list to:
“Jacket, gloves, boots, goggles, skis.”
That small correction illustrates an important writing habit: when a word looks unusual, checking a reliable dictionary is better than relying on what visually “looks right.”
The same issue can appear when someone writes a travel blog. For example, a sentence such as “Make sure your skiis are packed before leaving” contains a spelling error.
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Changing it to “Make sure your skis are packed before leaving” immediately makes the sentence standard English.
This matters because ski is commonly used in several contexts. A person might write about ski equipment, ski resorts, ski boots, ski slopes, or skiing trips.
When the writer needs to refer to multiple pieces of equipment, skis is the appropriate plural.
The lesson is simple: you do not need to memorize a complicated exception. Just remember that the plural is formed by adding -s directly to ski.
Skis in 2025–2026: Why the Word Still Matters
The word skis is not merely a dictionary example. It remains an important term in modern discussions about winter sports and ski resorts.
The National Ski Areas Association reported that U.S. ski areas recorded an estimated 53.1 million skiers and riders visits during the 2025–26 season after final numbers were calculated in August 2026. The preliminary figure had been 52.6 million before the final update.
2025–26 Ski Industry Data
According to the National Ski Areas Association:
- 53.1 million estimated skier and rider visits were recorded in the U.S. during 2025–26.
- National snowfall averaged 112 inches.
- The 10-year snowfall average was 169 inches.
- U.S. ski areas reported $569.3 million in capital expenditures.
- Season passes accounted for 49% of visits nationally.
These figures show the continuing relevance of skiing and ski equipment in everyday language.
Importantly, a visit is not the same thing as a unique individual skier. NSAA explains that a snowsports visit is counted each time an individual uses a lift ticket or pass at a ski area.
So, while these statistics describe the ski industry rather than spelling directly, they provide current context for why terms such as ski, skis, skier, and skiing continue to appear frequently in modern English.
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Skis vs. Skiis: Quick Reference Guide
If you are still unsure, use this quick checklist.
Check the Word Before Publishing
Ask yourself:
- Am I talking about one piece of equipment?
- Use ski.
- Am I talking about more than one?
- Use skis.
- Did I write skiis?
- Change it to skis.
- Am I talking about the activity?
- Use skiing.
- Am I talking about a person?
- Use skier.
Word Family
| Word | Meaning | Example |
|---|---|---|
| ski | One piece of equipment / verb | I have one ski. |
| skis | More than one ski | My skis are new. |
| skiing | The activity | I enjoy skiing. |
| skier | A person who skis | The skier reached the finish line. |
| skied | Past tense of ski | We skied yesterday. |
This simple word-family chart can help prevent confusion between related forms.
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Mini Quiz: Skis or Skiis?
Test yourself with these quick, easy questions about the correct spelling of skis. Each answer is given right after the question so you can learn as you go.
1. Quick Spelling Check 🎿
Which spelling is correct?
Answer: Skis ✅
2. One or More?
What is the plural of ski?
Answer: Skis ✅
3. Spot the Mistake
Which word is incorrect: skis or skiis?
Answer: Skiis is incorrect. ❌
4. Fill the Gap
Complete this sentence: “I bought two new ___.”
Answer: Skis ✅
5. Easy Grammar Pick
Which is correct?
A. Two ski
B. Two skis
C. Two skiis
Answer: B. Two skis ✅
6. Remember the Rule
What do you add to ski to make it plural?
Answer: Add -s. ✅
7. Count It Right
One ski becomes what when there are two?
Answer: Two skis ✅
8. Sentence Check
Which sentence is correct?
A. My skiis are ready.
B. My skis are ready.
Answer: B. My skis are ready. ✅
9. Double “I” Trap
Does ski need another “i” before the plural ending?
Answer: No. Just add -s. ✅
10. Choose the Correct Phrase
Which phrase is right?
A. A pair of skiis
B. A pair of skis
Answer: A pair of skis ✅
11. Word Family Fun
Which word means the activity of moving over snow on skis?
Answer: Skiing ✅
12. Noun or Activity?
In “My skis are new,” does skis refer to equipment or an activity?
Answer: Equipment ✅
13. Fix the Sentence
Correct this: “She packed her skiis.”
Answer: “She packed her skis.” ✅
14. Memory Challenge
Complete the rule:
Ski + ___ = Skis
Answer: S ✅
15. Final Mini Challenge 🏆
Which sentence is completely correct?
A. We packed our skiis.
B. We packed our skis.
C. We packed our ski.
Answer: B. We packed our skis. ✅
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FAQs
1. Is “skis” the correct spelling?
Yes. Skis is the standard plural form of ski. Cambridge Dictionary lists skis as the plural noun form.
2. Is “skiis” a correct word?
No. Skiis is not the standard plural spelling of ski. In normal English writing, use skis.
3. What is the plural of ski?
The plural of ski is skis.
Example:
One ski → two skis.
4. Why isn’t the plural “skiis”?
You do not need to double the final i when making ski plural. Simply add -s:
ski + s = skis
5. How do you use “skis” in a sentence?
You can say:
My skis are ready for the weekend.
Here, skis refers to more than one ski.
6. Is “skiing” the plural of “ski”?
No. Skiing is the name of the activity or the present participle of the verb ski. The plural noun is skis.
For example:
- I bought new skis.
- I enjoy skiing.
Conclusion:
So, skis is the correct spelling, while skiis is a common misspelling.
The rule is extremely simple:
ski + s = skis
When you mean more than one ski, always write skis. You do not need to add a second i.
Whether you are writing a school assignment, blog post, travel guide, product description, or everyday message, choosing the correct spelling makes your writing clearer and more professional.
If you ever hesitate between skis or skiis, remember the easy formula: one ski, two skis.
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Hi, I’m Bilal Khalid, the founder of Gramixo. I’m passionate about helping people improve their English through clear, practical, and easy-to-follow grammar content. By combining my experience in SEO with a focus on creating helpful educational resources, I publish guides that simplify Grammar rules, explain common mistakes, and improve writing skills. Whether you’re a student, a professional, or an English learner, my goal is to make learning grammar easier, more enjoyable, and genuinely useful in everyday life.
