Cat Weight Chart: What a Healthy Cat Weighs, by Breed and Sex

Ten pounds (4.5 kg) is a fine weight for a cat. It is heavy on a Siamese, lean on a Maine Coon, and on the middle-sized tabby asleep on your sofa it depends entirely on what is under the fur.

That is the awkward truth behind every weight chart, this one included. A scale tells you how much cat there is, never how much of it is fat. So this page gives you two things: the weights that lean, measured cats came in at, breed by breed and sex by sex, and the hands-on scale that reads what the number misses. Kittens follow a different curve and have their own chart.

What a lean adult cat weighs, by breed and sex

Every figure below comes from one German study that weighed 614 adult cats at cat shows and in small-animal practices, scored each one by hand, and then kept only the cats sitting at ideal condition. Same scorer, same baby scale, every cat. So these are lean weights rather than averages of whoever walked in, and the count of cats behind each pair is in the last column.

Two columns, not one, and that is the finding rather than a formatting choice. The gap between the sexes is wide enough that the authors say averaging males and females together produces a number that fits neither. Their own worked example: a female of 8.8 lb (4 kg), from any of the lighter or middling breeds, is likely to be somewhere between 11 and 43% overweight. She would look perfectly average on a chart that gives one number for "a cat".

Sex also moves a breed between build classes. Grouped by size, British Shorthair females landed in the medium class and British Shorthair males in the large one, one breed on one scale. And there is no row here for "cat", because no major veterinary body publishes a plain healthy weight range for an adult domestic cat: the charts that do trace back to each other rather than to a clinic.

The same breed, two countries, two very different numbers

British Shorthairs make the point better than any caveat: held to ideal condition they weigh one thing, and weighed as they turn up at the clinic they weigh another.

The Australian column is heavier because it counts every cat, and 48% of those cats were classed as overweight. A chart of real weights is a photograph of a population, not a target.

The nine-point scale your hands can read

This is the part your vet actually uses, and it needs no equipment. On a one-to-nine scale, five is ideal. The quickest way in is your own hand:

• Underweight: run your fingers over the ribs and they feel like the knuckles of a closed fist.
• Ideal: they feel like your knuckles with the hand laid flat on a table.
• Overweight: they feel like the knuckles on the palm side of your hand, buried.

Now the full scale. Each point below is written from three independent veterinary descriptor sets, so the wording is ours and the substance is theirs. Body fat percentages are approximate and shift with sex, neuter status, age, breed and how they are measured.

Three notes that keep this honest. A score of six is considered acceptable in some cats, particularly older ones, and some Oriental breeds sit at their best around four. A small fat pad in front of the hind legs belongs on a cat at ideal condition and is not a fault. And the visual half of the scale was written for short coats: on a long-haired cat your eyes will lie to you and only your hands will not.

What one point above ideal really costs

The rule of thumb is everywhere, on clinic pages and in the manuals: each body condition point above ideal costs roughly 10 to 15 percent of body weight. One step, one fixed price. The German study above, which also weighed the cats that were not lean, most of them pedigree and most of them met at cat shows, priced it differently.

The 71 of them scored at six averaged 20% above their breed's lean weight. The 23 scored at seven averaged 54% above. The step from one point to the next is not the same size as the step before it, so the rule of thumb draws a straight line through what is actually a curve, and it flatters your cat more the further up the scale you go.

Six cats scored eight, and they averaged more than double their breed's lean weight, but that figure comes with a warning from the people who collected it. Each cat was scored with its owner standing there, and their own suspicion is that the fattest ones were given an eight rather than a nine out of politeness, which they call remarkable in a scientific study. Six cats is thin evidence besides. The top of the scale is where the rule of thumb fails and where the measurement gets shakiest, and both point the same way: up there you weigh the cat and ask a vet rather than estimating.

The numbers also look further apart than they are because the sources count different things: some track body fat per point, the column in the table above, and some track total body weight.

How common this is, market by market

Where the lines get drawn matters here. Most veterinary references call a cat overweight at 10 to 20% above its ideal weight and obese above 20%; the body running the American prevalence survey uses a stricter 30% for its own obese category. The prevalence figures below are not measured the same way as each other, so they sit side by side rather than in a ranking.

Only the American row comes from vets scoring cats in front of them, so treat the others as different instruments rather than lower rates. And the reason a page like this gets searched at all sits inside that American survey: owners failed to recognize excess weight in 28% of the cats their vet scored at six or above.

When the number on the scale is the message

Weight that moves on its own deserves more attention than weight that sits still. Unintended weight loss should set off alarms, and it can appear while a cat is eating normally, because some diseases raise the metabolic demand or block nutrients from being absorbed. That is a call to your vet, not a wait-and-see.

Two more lines are hard ones. A cat that has eaten little or nothing for 24 hours needs prompt veterinary assessment. And losing weight too fast carries its own danger, hepatic lipidosis, a fatty liver disease that can be fatal, with an overweight cat that has stopped eating as the classic setup.

Gain has no equivalent alarm bell: no veterinary source names a rate of gain that means call the vet, the way several name thresholds on the loss side. What that leaves you with is the trend, and a trend is only visible if somebody writes it down. Weigh monthly on a baby scale, the tool vets recommend for home weighing, because change you live with every day is the change you cannot see. If the number is climbing, our guide to the overweight cat is the next page; if it is falling without explanation, unplanned weight loss is; and portions are their own question in how much to feed a cat.

What to take away

• There is no single healthy weight for a cat, and no major veterinary body publishes one: lean adults measured from 6.2 lb (2.8 kg) for an Abyssinian female up to 13.4 lb (6.1 kg) for a Maine Coon male.
• Body condition runs one to nine, five is ideal, and it is read with your hands: at ideal, the ribs feel like your knuckles with your hand laid flat.
• The rule of thumb that one point above ideal costs 10 to 15% of body weight understates the climb: 71 cats scored at six averaged 20% above their breed's lean weight, and 23 scored at seven averaged 54% above.
• Females and males cannot share one number: a female of 8.8 lb (4 kg) from a lighter or middling breed is likely to be 11 to 43% overweight, and she would look average on a chart that gives one figure for "a cat".
• 61% of American cats scored in clinic in 2022 were overweight or obese, and their owners had not recognized it in 28% of the cats scored six or above.
• Unintended weight loss, or a cat that has eaten little or nothing for 24 hours, is a call to the vet rather than something to monitor at home.