Not sure if your mouse cage is big enough? Use this simple guide and calculator to make sure your mice have the space they need to live healthy, active lives.
Like rats, mice are social, energetic animals that need room to run, climb, and play. An undersized cage can lead to stress, illness, and behavior issues. This article shows you how to calculate the right cage size for your mice—using real measurements and minimum volume requirements.
Minimum Cage Size for Mice
Each mouse needs at least 0.03 cubic meters (or 30,000 cubic centimeters) of cage space. For groups of 2 or more, simply multiply that number by the total number of mice.
Recommended cage sizes:
| Number of Mice | Minimum Volume (cm³) | Recommended Dimensions (cm) |
|---|---|---|
| 1 | 30,000 | 60×30×30 |
| 2 | 60,000 | 70×40×40 |
| 3 | 90,000 | 80×50×45 |
| 4 | 120,000 | 100×50×50 |
Note: These are minimum guidelines. Going larger always improves your mice’s quality of life.
How to Calculate Cage Volume for Mice
Use this simple formula to check if your cage is big enough:
Cage Volume = Width (cm) × Depth (cm) × Height (cm)
Then divide the total by the number of mice. If the result is 30,000 cm³ or more per mouse, the cage is suitable.
Example:
- 70 cm × 40 cm × 40 cm = 112,000 cm³
- For 2 mice: 112,000 ÷ 2 = 56,000 cm³ per mouse → OK
- For 4 mice: 112,000 ÷ 4 = 28,000 cm³ per mouse → Too small
Want to Skip the Math?
Use the same trusted tool designed for rat owners—it also works for mice: Calculate their Cage Size Requirements
Simply enter your cage dimensions in centimeters, and it’ll tell you how many mice (or rats) it can support comfortably.
What Makes a Good Mouse Cage?
Besides size, a good cage for mice includes:
- Bar spacing: No more than 0.6 cm to prevent escape
- Solid levels: Avoid wire mesh floors
- Climbing accessories: Tubes, ladders, and platforms
- Hiding spots: Nest boxes, tunnels, and shelters
- Proper ventilation: For airflow and odor control
Also, always house mice in same-sex groups or neutered pairs to prevent unwanted litters.
Signs Your Mouse Cage Is Too Small
Even if the cage seems large, your mice may tell you otherwise. Watch for these signs of stress:
- Constant bar biting or chewing
- Excessive grooming or hair loss
- Aggression or chasing
- Frequent escape attempts
If you notice any of these behaviors, it’s time to upgrade or expand your cage.
Conclusion
Mice may be tiny, but they need enough space to live fully and naturally. A cage that meets or exceeds the 30,000 cm³ per mouse standard will support their physical and mental health.
Not sure if your cage qualifies? Use the Rat Cage Calculator today—it works just as well for mice and helps you make fast, accurate decisions about your pet’s housing.
Give your mice the space they deserve—and they’ll reward you with happy, healthy lives.