A scratching post has three specifications that decide whether a cat uses it: height, surface, and stability. Height 60 cm is the floor for an adult cat, 90 cm is better for a cat that stretches fully, and a post under 45 cm gets used lying down or not at all. Surface means one of three materials with very different wear rates. Stability means a base heavy enough that a 20 N sideways push moves the top by less than 5 mm.
Get those three right and a post lasts 8 to 14 months and absorbs most of the scratching a cat does 2 to 5 times a day, 5 to 30 seconds at a time.
Why 60 cm, and when 90 cm is the real number
A cat of 4 to 5 kg measures about 45 cm nose to tail base. Scratching with the front legs extended, the claws reach roughly 1.3 to 1.4 times body length off the floor, so 58 to 63 cm. A large breed at 55 cm of body length pushes the figure to 70 to 77 cm, so check the average for the breed in the breed quiz before settling on 60. Below the mark, the cat can only scratch with the forelegs bent, and most cats then choose the sofa arm instead.
Three working heights cover most homes: 45 cm for a kitten under 6 months or a senior cat that scratches from a crouch, 60 cm for the average adult, and 90 cm for a cat that reaches up and pulls down with its full weight. A 120 cm post only makes sense as part of a climbing unit, where the upper section doubles as a perch.
Three materials, three wear rates
Sisal rope. Rope diameter 6 to 8 mm, wound with gaps of 2 mm or less, on a post of at least 9 cm diameter. Sisal shreds instead of shedding sheets, so debris runs 2 to 5 g a month and the surface lasts 8 to 14 months. It is the most expensive of the three per post and the cheapest per month of use. Thin 4 mm rope on a 6 cm post frays at the glue line within 2 to 3 months; the full breakdown of rope versus sheet materials is in scratching materials compared.
Corrugated cardboard. Flute thickness 3 to 5 mm, density 0.6 to 0.8 g per cubic centimeter. Cats like the give, and the surface is replaceable, but debris runs 15 to 40 g a month, so a cardboard pad needs vacuuming every 3 to 4 days and replacing every 2 to 5 months. Flat pads work for horizontal scratching; a cardboard column under 60 cm tends to be shredded at one spot.
Loop-pile carpet. Pile height 4 to 6 mm, loop rather than cut pile. It lasts 4 to 10 months and leaves 5 to 12 g of fiber a month, but loop strands can be swallowed, so a heavy chewer should not get carpet. Cut pile, the fuzzy kind, gives little resistance and cats often ignore it entirely.
Material and stability numbers
| Material | Spec mm | Life months | Debris g/month | Cost index | Best for |
|---|---|---|---|---|---|
| Sisal rope | 6-8 dia, gap 2 | 8-14 | 2-5 | 1.6-2.0 | vertical 60-90 cm posts |
| Corrugated cardboard | flute 3-5 | 2-5 | 15-40 | 1.0 | flat pads, floor scratchers |
| Loop-pile carpet | pile 4-6 | 4-10 | 5-12 | 1.2-1.5 | angled ramps, low posts |
The cost index is per month of use, not per unit. Cardboard sits at 1.0 on purchase and 1.0 on the index only because it is replaced 3 to 5 times as often; a 60 cm sisal post works out cheaper over 12 months than 4 cardboard pads.
Base weight and the 5 mm test
A post that rocks gets abandoned within 2 weeks. Two numbers settle it. First, base footprint at least 4 times the cross-section of the column: a 9 cm column needs a base of 30 cm by 30 cm or a 34 cm diameter disc. Second, base mass at least 1.2 times the cat's weight, so 5 to 7 kg for a 4 to 5 kg cat, or a lighter base bolted to a wall.
Test it yourself: push the top of the post sideways with about 20 N, roughly the force of one finger pressing firmly. Movement under 5 mm passes. Above 10 mm, the cat will stop using it at the point where it starts to slide, and no amount of catnip fixes that.
Placement that raises use rate
Put the post within 1 to 2 m of where the cat wakes up, because 60 to 80 percent of scratching happens right after sleep. Place a second one beside the piece of furniture being damaged, close enough that the cat can reach both in one step. One post per cat plus one is the working rule, and in an apartment with a 6 m corridor, one post every 3 m of travel path.
Vertical beats horizontal by roughly 3 to 1 in most homes, so a 60 cm post plus a flat pad covers both preferences. Angled ramps at 30 to 45 degrees suit older cats that cannot fully extend. If you are deciding between the two shapes, scratch post vs pad sets out where each one fails: a post under 40 cm and a pad that slides both get abandoned within 2 weeks.
When to replace, and the 30 percent rule
Replace sisal when more than 30 percent of the wound surface is frayed through, or when the surface has a groove deeper than 5 mm. Replace cardboard when the top layer is torn through to the honeycomb in 2 or more places. A post stable at 20 N and intact at 60 cm will keep a cat off the sofa; a wobbly one at 40 cm will not, no matter how many times the cat is placed on it.
- Buy 60 cm minimum for an adult, 90 cm if the cat stretches to full height, 45 cm only for kittens or seniors.
- Check the surface: sisal 6 to 8 mm with 2 mm gaps, cardboard flute 3 to 5 mm, loop pile 4 to 6 mm.
- Confirm base mass at 1.2 times cat weight and footprint at 4 times column section.
- Push the top with 20 N; anything over 5 mm of movement needs a heavier base or a wall anchor.
- Place one post per cat plus one, within 1 to 2 m of the sleeping spot and beside the damaged sofa.
Terms mentioned in this article
Frequently asked
Is a 60 cm scratching post tall enough for a large cat?
For most cats of 4 to 5 kg, yes: full front-leg extension reaches about 1.3 to 1.4 times body length, or 58 to 63 cm. A cat over 5 kg, or one that stands and pulls down with its weight, needs 90 cm. Below 45 cm most cats can only scratch with bent forelegs and switch to furniture.
Which material lasts longest, sisal or cardboard?
Sisal, by a wide margin. Rope of 6 to 8 mm gives 8 to 14 months of use and 2 to 5 g of debris a month, while corrugated cardboard gives 2 to 5 months and 15 to 40 g a month. Cardboard is cheaper per piece and better as a flat pad, but replaced 3 to 5 times as often.
How do I stop a post from tipping over?
Two numbers: a base footprint at least 4 times the column cross-section, so 30 by 30 cm for a 9 cm post, and base mass at least 1.2 times the cat's weight, so 5 to 7 kg. Push the top with about 20 N; if it moves more than 5 mm, add weight or anchor it to the wall.