Plural of Mouse Explained: Why It’s Not Mouses
Quick Answer
The plural of mouse is mice. One mouse, two mice. Do not add -s — “mouses” is not correct.
Mouse and Mice — See the Pattern
Look at these sentences. Can you see when we use mouse and when we use mice?
- A small mouse ran across the kitchen floor.
- We saw three mice hiding behind the fridge.
- The cat caught a mouse last night.
- There are mice living in the old barn.
Did you see the pattern? We use mouse for one, and mice for two or more. The word changes completely — we do not just add -s.
| Singular (one) | Plural (more than one) |
|---|---|
| mouse | mice |
When to Use Mouse and When to Use Mice
The rule is simple:
- Use mouse when you talk about one — “I saw a mouse.”
- Use mice when you talk about two or more — “I saw two mice.”
- Do NOT add -s. “Mouses” is not correct in English.
This is called an irregular plural. Most English words add -s to become plural (cat → cats, dog → dogs). But “mouse” does not follow that rule. The whole middle of the word changes: the “ou” sound becomes an “i” sound.
Easy way to remember: Think of the word “ice.” M + ice = mice. If you can say “ice,” you can say “mice.”
The Rule in One Line: One mouse, two mice — change the -ouse to -ice.
How to Use Mouse and Mice in Everyday English
- I think there is a mouse in the kitchen. (= one small animal)
- Are you scared of mice? (= mice in general)
- The pet shop has five mice in that cage. (= a specific number)
- My cat loves to chase mice in the garden. (= more than one)
- We need to catch the mouse before it eats our food. (= one specific animal)
You are doing great. Now let us look at the mistakes many learners make.
The Most Common Mistake With Mouse and Mice
Many English learners add -s and say “mouses” — this is completely normal. Even native speakers’ children say “mouses” when they are learning to talk. So if you make this mistake, you are not alone.
✗ I saw three mouses in the garden.
✓ I saw three mice in the garden.
✗ There are mouses in the attic.
✓ There are mice in the attic.
How to remember: Mice rhymes with ice, rice, and nice. Say it out loud: “mice, ice, rice, nice.” That sound will stick in your head.
Other words that change like this: goose → geese, man → men, woman → women, tooth → teeth, foot → feet. These are all irregular plurals — the word changes instead of adding -s.
Test Yourself: Mouse or Mice?
Choose the correct answer for each sentence. Click Check to see if you are right.
1. I saw a _______ run under the bed.
2. There are three _______ living in our shed.
3. The cat caught a _______ in the garden.
4. Are you scared of _______?
5. My daughter found a baby _______ in the park.
Keep Going — You Are Building Something
You just learned the plural of mouse. That is one more irregular plural you will never get wrong again.
But here is something interesting. You know that mouse becomes mice. So what about man? Does it become “mans”? No — it follows its own special rule too. Do you know what it is?
Next lesson: Plural of Man — Why It’s Men, Not Mans
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My name is Khamis Maiouf. I am the creator of the English Teacher Site, dedicated to providing valuable resources and insights for students around the world. With a passion for education and a commitment to helping students enhance their skills, I aim to make English teaching more effective and enjoyable for both educators and students.
