Cat body condition score: how to tell if your cat is the right weight

By Josh · Reviewed and updated: 2026-09-20

The scale is the same nine points vets use for dogs, and the three checks are the same three checks. But cats have one feature that regularly makes owners misjudge them — and it is not excess fat. It is a piece of normal anatomy that looks exactly like a belly. Get that one thing right and the rest of the assessment is straightforward.

The nine-point scale, briefly

Body condition scoring rates fat cover and body shape rather than weight alone, because weight says nothing about whether the kilos are muscle or fat. The nine-point scale is the current standard in the WSAVA Global Nutrition Guidelines and the 2021 AAHA Nutrition and Weight Management Guidelines.

Each point is worth roughly 5% of body fat. The target for a cat is 5 of 9. That is worth knowing because the two most-quoted sources differ slightly on whether cats get a range: the WSAVA guidance states the goal for most pets as 4 to 5, while Merck's veterinary manual gives the ideal as 5 for cats and 4–5 for dogs. In practice a lean, healthy cat scoring 4 is not a problem — but if your vet quotes 5 for a cat and a range for a dog, this is where that comes from.

Context for the numbers: ideal body condition corresponds to roughly 20–24% body fat, and the 5%-per-point figure is the step between adjacent scores measured from the ideal point (Merck Veterinary Manual; body-fat bands adapted from Laflamme 1997 and the 2021 AAHA guidelines).

Two scales are in circulation

Some practices still use an older five-point scale, where 3 is ideal. So if your vet gives you a number, ask which scale it is. A "3 out of 5" and a "5 out of 9" describe the same cat.

The pouch is not fat

This is the thing that sends owners to the wrong conclusion. Cats have a primordial pouch — a loose fold of skin and thin tissue that hangs below the belly, sometimes swinging noticeably when they walk or run.

It is normal anatomy. It is not a fat pad, and it does not mean your cat is overweight. Every cat has one to some degree; it is thought to protect the abdomen in a fight and to allow the belly to stretch after a large meal.

The three checks, adapted for cats

• Ribs — run your fingertips lightly across the sides of the chest. At an ideal score you can feel each rib easily, under a thin layer of fat: the sensation is like running your fingers over the back of your own hand. If the ribs are visible from across the room, the cat is too thin. If you have to press firmly and still cannot pick out individual ribs, there is too much fat over them.
• Waist, from above — stand over the cat while it stands. Looking down, there should be a visible indentation behind the ribs, so the body narrows at the waist instead of running straight from shoulder to hip. A straight-sided or barrel-shaped outline from above is the most reliable overweight sign in a cat.
• Belly tuck, from the side — from the side, the abdomen should tuck up behind the ribcage, so the lowest point of the belly sits higher than the chest line. But discount the pouch when you read this: the tuck is about the body wall, not the skin hanging below it.

What each score looks like in a cat

Note where the risk starts. Disease associations for adult cats and dogs begin to rise above a score of 6 — so 6 is not "close enough", it is the first band where the direction changes.

Muscle is scored separately, and it matters in cats

Body condition score measures fat. Muscle condition score (MCS) measures muscle, and it is assessed separately — by looking at and feeling over the skull, shoulder blades, spine and pelvis.

A cat can carry too much fat and be losing muscle at the same time, and that combination is common in older cats. It matters because muscle loss is associated with worse outcomes in illness, and because a cat losing muscle can look "fine" on a scale while getting weaker.

MCS is usually graded as normal, mild loss, moderate loss or severe loss. If you feel a bony ridge along the spine and hip points that was not there a year ago, that is worth mentioning to your vet even if the body condition score looks ideal.

The number that actually matters: what to feed

Scoring is only useful if it changes what goes in the bowl. The key rule for an overweight cat is that the amount is calculated from the ideal weight, not the current weight. Feeding a 5.4 kg cat the amount for 5.4 kg keeps it at 5.4 kg.

Here is how the numbers work out for a 5.4 kg cat assessed at roughly 7/9, with an estimated ideal weight of 4.5 kg:

Figures from the cat portion calculator at 380 kcal per cup and 100 g per cup. Use your own food's numbers.

Why this matters more in cats than in dogs

• Diabetes risk. Excess body fat is a recognised risk factor for diabetes in cats in particular — more so than the equivalent overweight state in dogs.
• Joints. Cats hide joint pain well, so arthritis in an overweight cat is often attributed to "slowing down with age" rather than to the weight.
• It creeps. A cat gaining 400 g has gained a tenth of its body weight. On a 4.5 kg animal that is the equivalent of a 70 kg person gaining 7 kg — and it can arrive in a single winter of indoor living and free feeding.
• Owners underestimate. Studies of owner assessment repeatedly find that most people judge their pet as lighter than the vet's scoring does.

How often to check

Every two to four weeks for a cat on a weight plan, and at least every few months otherwise. Run the three checks in the same order each time, and write the score down. A single score is an impression; a series of scores is information — and with cats, the trend matters more than any one reading, because the changes are small enough to miss month to month.

Frequently asked questions

Work out your cat's daily amount in grams →
The same nine-point scale, for dogs →
Why cats and dogs need different amounts →
Free feeding and the appetite signal →