Cat Shelf Spacing Calculator
Shelf spacing, depth, stagger and bracket load for a wall-mounted cat route, worked from your cat's body length and the wall you actually have. Switch to a floor tree at any point.
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Height follows your keenest climber, step spacing follows the cat who struggles most, perch size follows the biggest.
Everything is worked out in your browser, so the numbers never leave your device. The shareable link reopens the calculator with these values, and with your design if you have edited one.
Results
Quick answer
Cat wall shelves want about 0.8 body lengths of vertical rise between them, a depth of at least 85% of body length so the cat can turn round, and no more than two body lengths of sideways travel between consecutive shelves. Every route needs a landing at the bottom, because getting down is what causes injuries.
rise = 0.8 x body length; depth = 0.85 x body length; max sideways = 2 x body length
Cat shelf spacing by cat size
Wall shelves sit closer together than tree platforms, because there is no post to climb between them. Vertical rise is about 0.8 body lengths for an average adult and roughly half that for a cat with stiff joints.
| Cat | Rise | Depth | Lounging shelf | Stepping shelf | Max sideways | Safe drop |
|---|---|---|---|---|---|---|
| Small adult, 8 lb | 11 in | 14 in | 27 in | 19 in | 33 in | 30 in |
| Average adult, 10 lb | 14 in | 16 in | 29 in | 20 in | 36 in | 33 in |
| Keen climber, 12 lb | 20 in | 17 in | 31 in | 22 in | 39 in | 35 in |
| Large breed, 18 lb | 18.5 in | 20 in | 38 in | 26 in | 47 in | 42 in |
| Senior or stiff joints | 8 in | 16 in | 29 in | 20 in | 18 in | 17 in |
Safe drop is the most a cat should have to come down in one go at the bottom of the route. If the first shelf is higher than that, put furniture or a tree underneath it.
At a glance
| What it does | Shelf rise, depth, length, stagger and bracket load for a wall-mounted cat route |
|---|---|
| Category | Pets |
| Inputs needed | Cat weight or body length, life stage, wall run, first and highest shelf height |
| Main output | Verdict, number of shelves and rise between them |
| Formula | rise = 0.8 x body length; depth = 0.85 x body length |
| Cost | Free, no sign-up, no download |
How to use the Cat Shelf Spacing Calculator
- Enter your cat's weight, or measure nose to base of tail, and say whether they have trouble jumping.
- Measure the clear wall run, avoiding doors, radiators and pictures.
- Set where the cat gets on, usually off a sofa back or an existing tree, and how high you want the route to go.
- Check the rise, depth and stagger against the drawing, and confirm the route has a landing at the bottom.
- Locate the studs before you buy brackets. If a stud does not land where a shelf needs to be, move the shelf.
Frequently asked questions
How far apart should cat wall shelves be?
About 0.8 body lengths vertically for an average adult, so roughly 14 in for an 18 in cat, and about half that for a senior or a cat with stiff joints. Shelves sit closer than tree platforms because there is no post to climb between them.
How deep do cat shelves need to be?
At least 85% of body length, so an average cat needs about 15 in of depth to turn round comfortably. Anything under 10 in becomes a ledge the cat edges along rather than a place it will settle.
How far apart horizontally can cat shelves be?
No more than about two body lengths between consecutive shelves, and less for a senior. Past that the route stops being a set of steps and becomes a series of jumps, which is where landings go wrong.
What weight do cat shelf brackets need to hold?
Rate each shelf to about five times your cat's weight to cover a running landing rather than a step. Screw into studs, and if a stud does not fall where the shelf needs to be, move the shelf rather than trusting a plasterboard anchor.
Do cat shelves need carpet?
Yes, or sisal, or a rubber runner. Bare varnished shelves get skidded off, especially on the way down, and a cat that slips once will often abandon the whole route.
How does a cat get down from wall shelves?
By the same route, which is why the bottom of the run matters most. The first shelf should be within one safe drop of the floor or of furniture, otherwise the cat commits to a descent it cannot make comfortably.
Results are estimates for general information. Sizing is built from feline body proportions and static stability, not veterinary advice. If your cat has a diagnosed joint or mobility condition, confirm safe heights with your vet.
Related calculators
- Cat Tree Size Calculator
- Cat Age Calculator — coming soon
- Cat Calorie Calculator — coming soon