How much should a Persian weigh? A typical adult Persian weighs 3–6 kg (6.6–13.2 lb), with a typical lifespan of 12–17 years. That range comes from the published breed-standard data for the breed, and it is the starting point — not a prescription for an individual cat. This guide gives the ideal weight range for a Persian, the daily calories at the middle of the range, how weight changes with age, and how to check your own Persian at home. A Persian is a medium breed, commonly described as calm, affectionate, gentle, and may be prone to hairballs and kidney disease.
The short version is: weigh the Persian monthly, compare with the 3–6 kg range, and then check with your hands — ribs easy to feel under a thin layer of fat, waist visible from above, tummy tuck visible from the side. A Persian inside the range that passes the hands-on check is at a healthy weight. A Persian outside the range, or one that fails the check, needs its food adjusting. The Persian food guide gives the calorie tables for this breed, and the Persian age guide gives the human-age equivalents at every age.
How much should a Persian weigh?
A typical adult Persian weighs 3–6 kg as an adult, which is about 6.6–13.2 lb. At the middle of that range, about 4.5 kg, a typical neutered adult needs about 260 calories a day — worked out from the resting energy requirement (RER) formula vets use, where RER equals 70 times body weight in kg to the power of 0.75, multiplied by 1.2 for a typical neutered indoor cat. An intact adult needs about 10 to 20% more, a very active Persian needs more again, and a senior or a Persian that needs to lose weight needs less.
That range is a range, not a target: a Persian at the bottom of its range and a Persian at the top of its range are both normal Persians, and the right weight for an individual cat depends on its build, its muscle, its age, and its health. A muscular Persian weighs more than a slim Persian of the same height, and a senior Persian that has lost muscle weighs less than it did as an adult — both can be healthy at weights that look wrong on the chart. That is why the hands-on check matters more than the number: ribs that are easy to feel, a waist that is visible, and a cat that moves well are worth more than a number inside a range. The cat body condition score chart gives the nine-point scale vets use.
How a Persian's weight changes with age
A Persian kitten grows fast in its first year, reaching about half its adult weight well before its first birthday, but bones and joints keep maturing after that. As a very rough guide, a kitten's weight as a share of its expected adult weight is about a fifth to a quarter at 8 weeks, about a quarter to a third at 3 months, about a third to two-fifths at 4 months, about half to two-thirds at 6 months, about three-quarters to four-fifths at 9 months, and about four-fifths or more at 12 months, when small breeds are near-adult and large breeds are still growing. Use that rough guide with the breed's expected adult weight of 3–6 kg, not instead of it.
As an adult, a Persian's weight should be stable: the same food, the same exercise, and the same weight, month after month. If weight drifts up, cut food by about 10% and re-weigh in a month; if weight drifts down without a change in food, mention it to your vet. As a senior — from about 11 years — a Persian may lose muscle and weight even when it is eating well, and that needs a vet check, not just more food. The Persian lifespan guide covers the breed's life stages, and the kitten weight chart by age guide gives the growth shares by age.
How to check a Persian at home
Run your hands along the Persian's ribs, with flat fingers and light pressure, while the cat is standing. You should feel each rib easily under a thin layer of fat, like feeling the bones in the back of your hand. If you have to press hard to find the ribs, the Persian is carrying too much fat; if the ribs are sharp and easy to see, the Persian is carrying too little. Now look down at the Persian from above: you should see a waist — a narrowing behind the ribs — and from the side you should see a tummy tuck, where the belly rises from the chest to the back legs.
Do the check monthly, at the same time as the weigh-in, and write down what you find. The line over months is what matters, not any single reading. A Persian is small enough to weigh on bathroom scales: step on holding the dog, then step on without it, and take the difference. The how to weigh your cat at home guide explains the method in detail, and the how to tell if your cat is overweight guide gives the hands-on check in detail.
Feeding a Persian at a healthy weight
Feed a complete and balanced food suited to the Persian's life stage, measured with scales or a measuring cup, split into two meals a day for an adult. A Persian at the middle of its range, about 4.5 kg, needs about 260 calories a day as a typical neutered adult — use that as a starting point, then adjust by monthly weigh-ins. Keep treats under 10% of daily calories, and count them — a treat here and a piece of cheese there can add a quarter to the daily calories without anyone noticing. Measure food with scales, not a mug or a handful, because a mug of dry food can carry a quarter more calories than a measured cup.
Exercise matters too, at a level that suits the breed: calm, affectionate, gentle is how the breed is commonly described, and that shapes what exercise it needs and enjoys. Keep exercise regular and daily, build it up gradually if the Persian is overweight, and watch for stiffness or tiredness the next day. The Persian food guide gives the calorie tables for this breed by weight and life stage, and the cat calorie calculator works out daily calories for any weight.
When a Persian's weight needs a vet
See a vet if the Persian is well outside the 3–6 kg range, if it is losing weight without a change in food, if it is lethargic or off its food, if it is a senior that is losing weight, or if it is a young animal that is not growing. A vet check first is sensible because some medical conditions cause weight change, and those need treating, not just more or less food. Persians may be prone to hairballs and kidney disease, which are worth knowing about so you can ask your vet about early signs rather than discovering them late.
At the vet, expect a weigh-in, a body condition score, and questions about food, treats, exercise, and other pets in the house. The vet may also check the teeth, because dental pain is a common cause of weight loss, and may run a blood test if the weight change is unexplained. Do not try to put weight on a Persian or take weight off a Persian with a crash diet or a sudden large increase in food — both are risky, and both need a plan set with a vet. The how to help a cat lose weight safely guide and the how to help a cat gain weight safely guide give the safe plans for both directions.
For related reading, see the Persian food guide, the Persian age guide, the Persian lifespan guide, the cat body condition score chart, the how to weigh your cat at home guide, the cat ideal weight calculator.
Frequently asked questions
How much should a Persian weigh?
A typical adult Persian weighs 3–6 kg (6.6–13.2 lb). At the middle of that range, about 4.5 kg, a typical neutered adult needs about 260 calories a day. Within the range, the right weight is the one where the ribs are easy to feel, the waist is visible from above, and the cat moves well.
How do I know if my Persian is overweight?
Feel the ribs — you should feel them easily under a thin layer of fat — look for a waist from above, and look for a tummy tuck from the side. If you cannot feel the ribs and there is no waist, the Persian is carrying too much weight. Weigh monthly and check the body condition score, where 4 to 5 is ideal.
How many calories does a Persian need?
A typical neutered adult at the middle of the range, about 4.5 kg, needs about 260 calories a day. An intact adult needs about 10 to 20% more, a very active Persian needs more again, and a senior or a Persian that needs to lose weight needs less. Adjust by monthly weigh-ins.
How long do Persians live?
A typical lifespan for a Persian is 12–17 years. That is a range, not a promise — genetics, weight, diet, exercise, and veterinary care all move an individual cat within its range or beyond it. The Persian lifespan guide covers what affects it and how to help a Persian live longer.
How much should a Persian kitten weigh?
As a very rough guide, a kitten's weight as a share of its expected adult weight of 3–6 kg is about a fifth to a quarter at 8 weeks, about half to two-thirds at 6 months, and about four-fifths or more at 12 months. Use the kitten weight chart by age guide for the full shares, and ask your vet to check growth rather than changing food on your own.
When should a Persian see a vet about weight?
See a vet if the Persian is well outside the 3–6 kg range, if it is losing weight without a change in food, if it is lethargic or off its food, if it is a senior that is losing weight, or if it is a young animal that is not growing. Bring the weight record and the food details.
Results on this page are estimates for general information only and are not veterinary advice. If your pet is ill, underweight, overweight, pregnant, or has a health condition, consult your veterinarian before changing diet or care.