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Quick Answer: Measure your cat from nose to tail base (not tail tip) and add 10–15cm for a snug fit, or 20–25cm for a stretch-out bed. Most adult cats need a bed 45–55cm in diameter or length. Kittens start at 35cm but grow quickly — buy for adult size. Large breeds (Maine Coon, Ragdoll, British Shorthair) need 55–65cm. When in doubt, go one size up — cats prefer too big over too small.
Table of Contents
How to Measure Your Cat for a Bed
The most reliable way to get the right size is to measure your cat while they are relaxed:
- Body length: Measure from the tip of the nose to the base of the tail (where tail meets body, not the tail tip). This is the key measurement.
- Stretched length: If your cat stretches out when sleeping, measure from front paws to back paws while stretched.
- Curled diameter: If your cat curls into a ball, measure the diameter of the circle they form.
The Sizing Formula
- Curling cats (donut/round beds): Curled diameter + 10–15cm
- Stretching cats (rectangular beds): Stretched length + 15–20cm
- Enclosed beds (caves/igloos): Body length + 10cm minimum (cats need room to turn around)
Cat Bed Size Chart by Breed
Bed Shape and Size Relationship
Round / Donut Beds
Sized by internal diameter. A 50cm round bed has less usable space than a 50cm rectangular bed. For round beds, add an extra 5cm to your target size. The raised edges eat into sleeping space.
Rectangular / Mat Beds
Most efficient use of space. Sized by length x width. Ideal for cats who stretch out. A 55cm x 40cm bed suits most adult cats.
Cave / Igloo Beds
Interior space is smaller than external dimensions suggest. Always check the internal measurements — a cave bed listed as “50cm” may only have 40cm of internal floor space once you account for the walls and roof.
Window Perch Beds
Limited by window sill width. Most perches are 40–55cm wide. Check your window sill before buying and measure your cat’s length to ensure they can lie down comfortably.
Your Cat’s Sleeping Style Matters
- The Curl: Cats who sleep in a tight ball are happy in smaller, round beds. A snug fit actually makes them feel more secure.
- The Stretch: Full-length stretchers need rectangular beds at least 15cm longer than their stretched body. Undersized beds mean legs hanging over the edge.
- The Loaf: Tucked-paw position suits bolster beds with a flat sleeping surface and raised back support.
- The Belly-Up: Confident cats who sleep exposed prefer open beds with low or no sides. They need width more than length.
- The Hider: Cats who seek enclosed spaces need cave or igloo beds with enough internal space to turn around and adjust position.
Common Sizing Mistakes
- Buying kitten-sized for adults: Kittens grow fast. A kitten bed is useless within 4–6 months. Buy for adult size from the start.
- Using external dimensions: Always check internal/sleeping surface dimensions. A 60cm bed with thick walls may only have 45cm of floor space.
- Too small for enclosed beds: Cats need room to turn around inside caves and igloos. If the internal space is barely larger than your cat, they will not use it.
- Forgetting multi-cat households: If your cats share beds, you need significantly larger sizes — or multiple beds.
- One-size-for-all breeds: A Maine Coon needs roughly twice the bed size of a Siamese. Breed matters significantly.
Key Takeaways
- Measure nose to tail base, not tail tip, then add 10–20cm depending on sleeping style
- When in doubt, go one size up — cats never complain about too much space
- Check internal dimensions, not just external size, especially for enclosed beds
- Consider your cat’s sleeping style — curlers need round beds, stretchers need rectangular
- Buy adult size from the start — kittens outgrow beds within months
Frequently Asked Questions
Can a cat bed be too big?
It is very rare for a bed to be too big. Most cats are happy in oversized beds. However, very small cats in very large beds may feel exposed and insecure — they prefer the snug, enclosed feeling. If your small cat seems to avoid a large open bed, try adding a blanket or switching to an enclosed style.
What size bed does a Maine Coon need?
Maine Coons are one of the largest domestic breeds, with males reaching 8–12kg. A 60–70cm bed is recommended, and for large males, you may need to look at small-dog beds (75cm+). Always measure your individual cat — Maine Coons vary significantly in size.
Do cats prefer round or rectangular beds?
It depends entirely on sleeping style. Curlers prefer round beds (most cats), stretchers prefer rectangular. Observe how your cat sleeps on the sofa or floor — that is the shape to match. Some cats use both styles at different times of day.
Should I buy a cat bed or a small dog bed?
For large cat breeds (Maine Coon, Ragdoll), small dog beds are often the perfect size. There is no functional difference between a cat bed and a small dog bed — the materials and construction are typically identical. Just ensure there are no heavy-duty features (like very high sides) that would be uncomfortable for a cat.
Summary
Getting the right bed size comes down to measuring your cat, understanding their sleeping style, and checking internal dimensions rather than external ones. Most adult cats need 45–55cm beds, with large breeds needing 55–65cm. When in doubt, size up. A bed that is slightly too big is always better than one that is too small.
Related reading: Cat Beds Guide | Best Cat Beds UK | Cat Supplies
