Last updated: October 3, 2026
Cat Weight in kg (and lb)
A healthy cat weight chart shown in both kilograms and pounds, plus a quick kg to lb conversion reference. Most domestic cats weigh 3.6–5.4 kg (8–12 lb) as adults. Use this as general guidance and confirm your cat's ideal weight with your vet.
Healthy Cat Weight Chart by Age (kg and lb)
Typical weight ranges for an average domestic cat at each life stage, in kilograms and pounds side by side
| Age | Weight (kg) | Weight (lb) | Notes |
|---|---|---|---|
| Birth | 0.09–0.12 kg | 0.2–0.26 lb | Newborn, eyes closed |
| 1 month | 0.23–0.37 kg | 0.5–0.8 lb | Weaning begins |
| 2 months | 0.7–1.1 kg | 1.5–2.5 lb | Ready for adoption |
| 3 months | 1.1–1.6 kg | 2.5–3.5 lb | Rapid growth phase |
| 4 months | 1.6–2.3 kg | 3.5–5.0 lb | Active, playful |
| 6 months | 2.3–3.2 kg | 5.0–7.0 lb | Adolescent, filling out |
| 9 months | 3.0–4.1 kg | 6.5–9.0 lb | Growth slowing |
| 12 months | 3.4–5.0 kg | 7.5–11.0 lb | Near adult size |
| 18 months | 3.6–5.9 kg | 8.0–13.0 lb | Fully grown |
| 2+ years (adult) | 3.6–5.4 kg | 8.0–12.0 lb | Maintenance weight |
Ranges are general guidance for an average-sized domestic cat. Small breeds run lighter and large breeds heavier, and individual cats vary with frame and sex.
Want personalized recommendations for your cat?
Every cat is different. Get a healthy weight estimate based on your cat's breed, age, and build in kg or lb.
Try the Cat Weight Calculator →Cat Weight kg to lb Conversion Table
To convert kilograms to pounds, multiply by 2.20462. To convert pounds to kilograms, divide by 2.20462 (or multiply by 0.4536). The conversion factor is 1 kg = 2.20462 lb. These quick references cover the weights most cats fall into.
| Weight (kg) | Weight (lb) |
|---|---|
| 2 kg | 4.41 lb |
| 3 kg | 6.61 lb |
| 3.5 kg | 7.72 lb |
| 4 kg | 8.82 lb |
| 4.5 kg | 9.92 lb |
| 5 kg | 11.02 lb |
| 5.5 kg | 12.13 lb |
| 6 kg | 13.23 lb |
| 6.5 kg | 14.33 lb |
| 7 kg | 15.43 lb |
| Weight (lb) | Weight (kg) |
|---|---|
| 5 lb | 2.27 kg |
| 8 lb | 3.63 kg |
| 10 lb | 4.54 kg |
| 12 lb | 5.44 kg |
| 15 lb | 6.80 kg |
| 18 lb | 8.16 kg |
Quick mental math: a kilogram is a little over two pounds, so you can roughly double the kg figure and add ten percent to estimate pounds. For an exact healthy-weight range tailored to your cat, use our Cat Weight Calculator.
What Is a Normal Cat Weight in kg?
Most healthy adult domestic cats weigh between 3.6 and 5.4 kg (8–12 lb). That range covers the majority of ordinary house cats, but breed and frame shift it in both directions, which is why a single number never fits every cat.
- Small or lightly built breeds: cats such as the Singapura, Cornish Rex, or a petite domestic cat often sit around 2.3–3.6 kg (5–8 lb) at a healthy weight.
- Average domestic cats: the typical range is 3.6–5.4 kg (8–12 lb), with males usually heavier than females of the same background.
- Large breeds: cats such as the Maine Coon, Ragdoll, or Norwegian Forest Cat can healthily reach up to 9 kg (about 20 lb) thanks to their heavy frame and larger size.
Because build varies so much, the number on the scale means the most when you read it alongside body condition. In a healthy cat you should be able to feel the ribs easily under a thin layer of fat, see a waist when looking down from above, and notice a slight tummy tuck from the side. If the ribs are hard to feel and the waist has disappeared, your cat is likely carrying extra weight even if the figure looks normal for the breed. This page is general guidance, so confirm your cat's ideal weight with your vet.
Weight also changes with age. For a full breakdown of how kittens grow into adults, see our cat weight by age guide, and to compare pedigree ranges see average cat weight by breed.
Frequently Asked Questions About Cat Weight in kg and lb
Common questions about normal cat weight and converting between kilograms and pounds
What is a normal cat weight in kg?
Most healthy adult domestic cats weigh between 3.6 and 5.4 kg (8–12 lb). Small or lightly built breeds may sit nearer 2.3–3.6 kg, while large breeds such as the Maine Coon can healthily reach up to 9 kg. Because build and breed vary, use body condition alongside the number, and confirm your cat's ideal weight with your vet.
How many kg should a cat weigh?
A typical adult cat should weigh around 3.6–5.4 kg (8–12 lb). Females and lean breeds tend toward the lower end, while males and larger-framed cats sit higher. There is no single correct number for every cat: a healthy weight depends on frame, sex, and breed, so judge by body condition (you should feel the ribs easily and see a waist) and ask your vet for a target.
How do I convert my cat's weight from lb to kg?
Divide the weight in pounds by 2.20462 to get kilograms (or multiply pounds by 0.4536). For example, a 10 lb cat weighs 10 ÷ 2.20462 = 4.54 kg. To go the other way, multiply kilograms by 2.20462 to get pounds, so a 4 kg cat weighs about 8.82 lb. The conversion factor is 1 kg = 2.20462 lb.
What is the average male cat weight in kg?
An average adult male cat weighs roughly 4.5–5.9 kg (10–13 lb), a little more than females, which usually sit around 3.6–5.0 kg (8–11 lb). Large breeds push higher and lean breeds lower, so the figure is a starting point rather than a fixed target.
Is 6 kg overweight for a cat?
For an average domestic cat, 6 kg (about 13.2 lb) is above the typical 3.6–5.4 kg range and may indicate excess weight, especially in a small or medium-framed cat. For a large breed such as a Maine Coon it can be perfectly healthy. Check body condition (can you feel the ribs and see a waist?) rather than the scale alone, and confirm with your vet.
Check Your Cat's Weight & Health
Use our free calculators for personalized recommendations in kg or lb.
Free cat printables
Keep these cat care guides handy
A rotating selection of practical cat guides chosen from our free printable library.Kitten Calorie Guide
Calorie targets by kitten age and weight.
Cat Quality of Life Checklist
Track the HHHHHMM quality-of-life measures.
Cat Pregnancy Timeline
A week-by-week kittening calendar and checklist.