Tool 02
Is my cat the right weight?
Published breed weight ranges scaled along the feline growth curve, then cross-checked against body condition, because the same number on the scales means different things on different skeletons.
Your cat
Body condition, felt by hand
Scored 5/9, ideal. Five is the target on the WSAVA scale.
How to read the result
Breed ranges are frame estimates, not rules. Domestic Shorthair adults typically weigh 3.5–7 kg, and this tool scales that range down for cats under a year so a kitten is compared with kittens rather than adults.
The percentage figure is your cat against the midpoint of that range. Anything from 88% to 112% is comfortably normal; above 130% is a clinical concern rather than a cosmetic one.
Body condition is the tiebreaker, and it beats the scales whenever the two disagree. A heavily muscled cat can read as overweight and be perfectly lean; a thin-framed cat can sit inside the range and still be carrying too much fat. Trust your hands over the number.
Nothing here diagnoses anything. It tells you whether the trend deserves a conversation with your vet, and how fast a change can safely happen if it does.
Healthy range for a Domestic Shorthair
3.5–7kg
Your cat is at 95% of the 5.3 kg midpoint, 0.3 kg below.
Verdict
Right where they should be
Body condition
5/9 · Ideal
What that means
Keep the current routine, measure portions rather than free-feeding, and weigh monthly. The point of a healthy weight is that it is unremarkable, the work is in noticing when it stops being true.
Your inputs stay on this device, so the page reopens where you left it.
When weight change is a symptom
- Weight falling while appetite is normal or increased, hyperthyroidism or diabetes are common causes in older cats.
- Weight falling with increased thirst and urination, kidney disease and diabetes both look like this.
- Sudden refusal to eat for more than 24 hours, at any weight. Cats deteriorate fast when they stop eating.
- A cat that has lost 5% of body weight in three months without a diet.
- Weight gain with reduced activity and difficulty grooming the lower back, often arthritis rather than laziness.
Weigh your cat properly
- 1Use the bathroom-scale trickWeigh yourself, then yourself holding the cat, and subtract. Kitchen scales work for kittens under 3 kg and are far more precise.
- 2Weigh at the same time of dayBefore the morning meal, on the same scales, on a hard floor. A full stomach and a full bladder are easily 150 g of noise.
- 3Score the body condition tooFeel the ribs, look down for a waist, look sideways for a belly tuck. Two cats at the same weight can sit at opposite ends of the 1–9 scale.
- 4Write it down every monthA single figure means nothing; a trend means everything. Five percent lost over three months deserves a vet visit even if the cat looks fine.
Five mistakes to avoid
Judging every cat against 4 kg
Breed frames differ by a factor of three. A 6 kg Maine Coon is lean, a 6 kg Singapura is in trouble. Set the breed first, then read the range.
Reading weight without body condition
Weight is a number; condition is what that number means on this particular skeleton. A muscular cat and a fat cat can weigh exactly the same.
Judging a kitten against adult numbers
Kittens are supposed to be light. This tool scales the breed range along the growth curve so an eight-week-old is compared with eight-week-olds.
Treating loss as good news
Unplanned weight loss is a symptom, not a success. If the food has not changed and the weight has, the next step is a vet, not a smaller bowl.
Crash-dieting an overweight cat
Cats are not small dogs. Severe restriction can trigger hepatic lipidosis within days. One percent of body weight per week is the ceiling, not the target.
Questions people actually ask
What is a healthy weight for a cat?
Most domestic cats sit between 3.5 and 5.5 kg, but breed changes that enormously: a Singapura may be healthy at 2.5 kg and a Maine Coon at 8 kg. The number only means something next to a body condition score, which is why this tool asks for both rather than judging weight alone.
How do I know if my cat is overweight without scales?
Feel the ribs: they should be easy to find under a thin fat layer, like knuckles under cloth. Look down from above for a waist behind the ribs, and from the side for a belly line that rises towards the hind legs. If ribs are hard to find and the waist has gone, the cat is carrying too much.
Is my kitten the right weight?
A healthy kitten gains roughly 100 g a week for the first six months and reaches most of its adult frame by twelve months, though large breeds keep filling out until three to four years. This tool scales the adult breed range along that curve so a kitten is never judged against adult numbers.
How much weight can a cat safely lose per week?
About 0.5–1% of body weight, and no more. For a 6 kg cat that is 30–60 g a week. Faster loss risks hepatic lipidosis, a serious and sometimes fatal liver condition. Any deliberate weight-loss plan should be agreed with your vet, who will also rule out illness first.
My cat is losing weight without a diet, should I worry?
Yes. Unplanned weight loss is one of the most reliable early signs of illness in cats, including hyperthyroidism, kidney disease, diabetes, dental pain and cancer. Cats hide symptoms well, so the scales often notice before you do. Book a vet visit rather than adjusting the food.
Do neutered cats need to weigh less?
No, the target weight is the same, but the calories needed to hold it drop by roughly 20–30% after neutering while appetite usually does not. That gap is why so many cats gain in the year after the operation. Reduce the portion at the time of surgery rather than after the weight appears.
How often should I weigh my cat?
Monthly for a healthy adult, weekly during a weight-change plan, and every two weeks for kittens and seniors. Use the same scales each time and weigh before a meal. Writing the figure down matters: gradual change is invisible day to day and only shows as a trend.
Sources
- WSAVA Global Nutrition Guidelines, body condition and nutritional assessment
- International Cat Care (ISFM), obesity and weight management in cats
- AAHA Nutrition and Weight Management Guidelines for Cats and Dogs
- Cornell Feline Health Center, obesity and hepatic lipidosis
- AAFP/AAHA Feline Life Stage Guidelines, monitoring and screening by age
Editorial note
Written for an international audience: metric throughout, no country-specific brands, shops or veterinary services. Breed ranges are typical adult figures, not standards to breed towards. This checker is education, not diagnosis, a cat whose weight is changing on its own needs a vet, not a recalculation.
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