This free cat bed size calculator tells you what size bed your cat needs, from curled and stretched sleeping lengths, for cats that sleep curled up and cats that sprawl. It runs fully in your browser, so nothing you type is sent to a server, and you need no account and no sign-up to use it.
Many cat owners buy a bed that looks right in the shop and too small at home, because cats stretch far longer than they look when curled. A bed should fit the stretched length, not the curled ball, or the cat will sleep beside the bed instead of in it. Measuring both poses first is the difference between a used bed and an ignored one.
Measure your cat nose to tail base while curled, then while fully stretched, type both numbers in centimetres, and press the calculate button. The tool shows the bed size for each pose and the recommended size.
The result is a sizing guide, not a promise your cat will use the bed. Cats also choose beds by warmth, height, and smell. Wash a new bed before first use so it smells like home, not like a shop.
Example: a cat that measures 30 cm curled and 55 cm stretched needs a bed about 63 cm across, because the stretched pose decides the size. A cat that measures 40 cm curled and 45 cm stretched needs about 53 cm.
Put the new bed where the cat already sleeps. A perfect bed in the wrong room stays empty, while a plain bed in the favourite spot gets used daily.
Add a worn item of your clothing. Your smell makes a new bed feel safe on the first night, which matters more than the bed brand.
Offer two beds in different spots. Cats change sleeping places with the sun and the season, and two beds cost less than one bed the cat refuses.
Common question: Do cats prefer round or rectangular beds? Curled sleepers love round bolster beds, while sprawlers prefer flat rectangular mats. Watch how your cat sleeps for a week before you buy.
Common question: Should the bed be raised off the floor? Many cats prefer a raised bed, because floors are cold and drafty. A low platform or a chair cushion often beats a floor bed.
Common question: How often should I wash a cat bed? Wash the cover every two to three weeks, and the whole bed monthly. A clean bed smells better to you and still smells like home to the cat after one night back.
Keep a simple notebook for a month. Write the numbers you used, the result, and what your cat did next. Did the cat sleep in the new bed, drink from the fountain, or walk calmly in the harness? That short record turns a vague feeling into clear evidence, and it makes the next adjustment much easier to judge.
A steady routine helps more than a perfect purchase. Feed at the same times, keep fresh water out, play at regular hours, and weigh your cat every few weeks. Cats settle well into routines, and a settled cat is easier to measure, easier to watch, and easier to keep healthy.
Finally, check the result against what you already own. If the new size is close to the old one, keep the old one. If it differs a lot, change in small steps and watch your cat for a week before you decide. Write both numbers down so you can compare them again later.
This tool is free to use as often as you like. Bookmark it, recheck the numbers when your cat grows, gains weight, or changes habits, and keep the daily routine steady. Small, steady habits matter far more for a cat than any single perfect number.