Cat Size Calculator
Enter your cat's weight, its body condition score on the 9-point scale and its life stage. The calculator estimates the ideal weight, how much to lose or gain, the calories a day and the food that comes to.
- Ideal cat weight
- Daily calories
- Food portions
Score 5 means you can feel the ribs easily and see a waist from above.
Body shape tells you more than the scale. On the 9-point body condition scale, 5 is ideal and each point above adds about 10% of extra weight. A 6 kg cat scoring 7 has an ideal weight of about 5 kg and needs roughly 190 kcal a day while it slims.
Cat calories chart
Neutered adults at ideal weight. Search for a weight.
| Weight (kg) | Calories a day | Dry food (g) | Wet food (g) |
|---|---|---|---|
| 2.5 | 167 | 44 | 186 |
| 3 | 191 | 50 | 212 |
| 3.5 | 215 | 57 | 239 |
| 4 | 238 | 63 | 264 |
| 4.5 | 260 | 68 | 289 |
| 5 | 281 | 74 | 312 |
| 5.5 | 302 | 79 | 336 |
| 6 | 322 | 85 | 358 |
| 7 | 361 | 95 | 401 |
Dry food at about 3.8 kcal a gram.
Weight and food
Neutered adult at ideal weight. Slide the weight.
The cat is drawn to scale with its daily food.
How to check a cat's size
Score and weigh. Step through it.
Weigh
On a scale.
Feel along the ribs with flat hands. They should feel like the back of your hand.
Thin, ideal or overweight
Body scores. Compare them.
Underweight.
Healthy.
Overweight.
Overweight cats are more prone to diabetes, joint pain and liver problems.
Before changing food
Diet checks. Tick each item.
Tick each item as you go.
Never starve a cat. Fast weight loss can cause a serious liver illness.
What you get
Cat weight. Each tile explains one result.
Target.
Lose or gain.
A day.
Grams.
Grams.
Treats should be no more than 10% of daily calories.
Frequently Asked Questions
No question matches that search.
What is a healthy weight for a cat?
Most domestic cats are healthiest between about three and a half and five and a half kilograms, but frame size matters, so use the body score.
How do I know if my cat is overweight?
If you cannot easily feel the ribs or see a waist from above, it is likely overweight.
How many calories does a cat need?
About two hundred to two hundred and fifty a day for a typical neutered adult.
How fast should a cat lose weight?
No more than about one per cent of its body weight a week.
How much dry food should I feed my cat?
Around fifty to sixty-five grams a day for an average cat, depending on the food.
What is a body condition score?
A hands-on check of ribs, waist and belly, scored from one, very thin, to nine, obese.
Do big breeds weigh more?
Yes. Large breeds can be healthy at seven kilograms or more, so the body score matters most.
A healthy shape for life
Use the body score, not just the scale, and adjust food gradually towards a healthy weight.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.