Is My Cat Overweight? Body Condition Score Chart and Safe Weight Loss

Your cat is overweight if you cannot easily feel the ribs under a thin layer of fat, there is no visible waist when you look down from above, and the belly hangs or bulges when you look from the side. The number on the scale helps, but it cannot answer the question alone: 5 kg is a healthy weight for a large-framed male and clearly too much for a small female. Vets use a body condition score (BCS) to make the call, and you can learn to do the same check at home in under a minute.

The short answer

• Use the 9-point body condition score: 4 to 5 is ideal, 6 to 7 is overweight, 8 to 9 is obese.
• Each point above 5 means roughly 10% more weight than ideal. A cat at BCS 7 is carrying about 20% extra.
• Is 5 kg too much for a cat? For an average domestic shorthair, 5 kg is the upper end of normal. Whether it is healthy depends on the frame and the body condition score, not the number.
• Lose weight slowly: about 0.5 to 1% of body weight per week, with a plan from your vet.
• Never starve a cat to slim it down. A cat that stops eating can develop hepatic lipidosis (fatty liver), which can be life-threatening.
• Weigh every 2 to 4 weeks on the same scale and keep a record so you can see the trend.

How to check your cat's body condition at home

Do this when your cat is relaxed, ideally on a table or on your lap. Long-haired cats hide fat well, so rely on your hands more than your eyes.

1. Ribs. Lay your flat hands on both sides of the chest and move them gently. In an ideal cat you feel the ribs easily, like the back of your hand. If you have to press to find them, there is too much fat.
2. Waist from above. Look down at your cat while it stands. A cat in ideal condition has a gentle inward curve behind the ribs. A straight or bulging outline means excess fat.
3. Belly from the side. Crouch to your cat's level. A small, soft fat pad low on the belly (the primordial pouch) is normal in many cats and swings when they walk. A belly that is round and firm all the way along is not.
4. Spine and hips. Run your fingers along the back. You should feel the spine and hip bones under a light covering, without them looking sharp.
5. Fat elsewhere. Fat deposits on the lower back, around the base of the tail, on the face and on the legs appear at higher scores.

Write the score down with the date and the weight. One score is a snapshot; three scores over two months tell you the direction.

Cat body condition score chart (1 to 9)

The 9-point scale below is the one used in the WSAVA global nutrition guidelines and by most vets. Half points are fine when your cat sits between two descriptions.

If your cat scores 3 or below, the problem is the opposite one and needs a vet visit, because unexplained weight loss in cats often has a medical cause. Our guide to signs your cat is sick covers what else to watch for.

Is 5 kg normal for a cat?

This is one of the most common questions owners ask, and the honest answer is: it depends on the cat. Most adult domestic cats weigh between 3.5 and 5 kg, so 5 kg sits at the top of the usual range. For a large male domestic shorthair or a British Shorthair, 5 kg can be ideal. For a small, fine-boned female, the same 5 kg can mean a score of 7.

Breed matters even more. A Maine Coon or Norwegian Forest cat can be lean at 7 kg or more, while a Siamese or Devon Rex at 5 kg is usually overweight. Our cat weight chart by breed lists healthy adult ranges for 17 breeds. Use it for orientation, then check the body condition score to decide.

How to estimate your cat's ideal weight

Because every point above 5 on the 9-point scale adds roughly 10% to the ideal weight, you can make a rough estimate of the target. Divide the current weight by the factor for your cat's score. Your vet will refine the target after an examination, especially for cats that have lost muscle.

At a safe pace of 0.5 to 1% per week, a 6 kg cat at BCS 7 needs several months to reach about 5 kg. That is normal and safer than trying to go faster.

Why extra weight matters for cats

Overweight cats rarely look unwell, which is why the problem creeps up. Extra fat is linked to:

• Diabetes mellitus. Obesity is one of the strongest risk factors for diabetes in cats. See diabetes in cats and dogs: symptoms and early signs.
• Arthritis and joint pain. Heavier cats jump less, play less and gain more weight as a result.
• Grooming problems. Cats that cannot reach their back and rear end get matted fur, dandruff and a dirty rear.
• Urinary problems. Overweight, inactive indoor cats are more prone to lower urinary tract problems.
• Fatty liver risk. Obese cats that suddenly stop eating are at the highest risk of hepatic lipidosis.

Neutering, an indoor lifestyle, free-choice feeding of dry food and getting older all make weight gain more likely. None of them make it inevitable.

How to help an overweight cat lose weight safely

Start with a vet visit before you change anything. Your vet will confirm the score, check for problems such as arthritis or diabetes that change the plan, and calculate a daily calorie target for the ideal weight rather than the current one.

1. Measure food in grams. Use a kitchen scale, not a cup. Small errors with dry food add up to large calorie differences for a cat. Our guide on how much to feed a dog or cat explains how to turn calories into grams.
2. Feed meals, not a full bowl. Split the daily amount into several small meals. Free-choice feeding makes portion control almost impossible.
3. Count treats. Treats should stay under 10% of daily calories, and they come out of the daily allowance, not on top of it.
4. Consider a weight-loss diet. Your vet may suggest a food designed for weight loss so your cat gets enough protein and nutrients while eating fewer calories.
5. Make food work. Puzzle feeders, food balls and hiding portions around the home slow eating and add activity.
6. Play every day. Two or three short sessions with a wand toy, about 5 to 10 minutes each, are more realistic for most cats than one long one.
7. Keep water available. Wet food and fresh water help, and drinking habits are worth watching. See how much water a cat should drink.
8. Weigh and score regularly. Weigh every 2 to 4 weeks on the same scale, at the same time of day, and adjust the plan with your vet if weight loss stalls or is too fast.

In a multi-cat home, feed the cat on a diet in a separate room or use a microchip feeder, otherwise the slimmest cat often ends up eating less and the heaviest one eats for two.

Log your cat's weight in PetVitals. Add each weigh-in as a dated record, see the trend on a chart and set a reminder for the next check so slow, safe progress stays visible.

Mistakes to avoid

• Crash diets or fasting. Never cut food drastically or skip days. Cats need a steady intake.
• Switching food overnight. Mix the new food in gradually over about a week to avoid stomach upsets and refusal.
• Weighing once and guessing. Single weighings mislead. A trend over weeks is what counts.
• Ignoring muscle. Older cats can lose muscle while keeping fat, so the weight may look stable while condition gets worse. Senior cats need closer monitoring, as covered in our guide to cat and dog years in human years.

When to call the vet

Book an appointment if your cat scores 6 or above, has gained weight steadily for several months, or you are unsure how to score it. Regular check-ups catch weight changes early; see how often a cat should go to the vet.

Call your vet the same day if:

• an overweight cat has eaten little or nothing for more than 24 hours;
• your cat loses weight quickly without a diet, or loses more than about 1% of body weight per week on one;
• your cat is drinking and urinating much more than usual;
• you notice yellow gums or yellow inner ears, vomiting, or sudden lethargy.

Weight problems in cats are common and very manageable. A clear score, a measured diet and a weight log you keep up are usually enough to bring a cat back to a healthy shape.