This tool helps determine if your cat is at an ideal weight based on breed standards. Enter your cat's current weight and select their breed to see how they compare to the ideal weight range for their breed.
The ideal weight for a cat varies dramatically by breed. A healthy Siamese might weigh 6 lbs, while a healthy Maine Coon could be 18 lbs. Our calculator compares your cat's current weight to breed-specific standards, but here's a quick reference for common breeds:
| Breed | Female (lbs) | Male (lbs) | Adult Age |
|---|---|---|---|
| Domestic Shorthair | 7–10 lbs | 9–12 lbs | 12–18 months |
| Siamese | 5–8 lbs | 8–12 lbs | 12 months |
| Persian | 7–11 lbs | 9–13 lbs | 18 months |
| Maine Coon | 8–14 lbs | 13–20 lbs | 3–4 years |
| Ragdoll | 8–13 lbs | 12–18 lbs | 3–4 years |
| British Shorthair | 7–12 lbs | 12–18 lbs | 3 years |
| Bengal | 6–10 lbs | 10–16 lbs | 18 months |
| Sphynx | 6–8 lbs | 8–12 lbs | 12 months |
| Abyssinian | 6–8 lbs | 7–10 lbs | 12 months |
| Scottish Fold | 6–9 lbs | 9–13 lbs | 18 months |
Kittens grow rapidly in their first year. Here are typical weight milestones for an average domestic cat (individual cats and breeds may vary):
| Age | Expected Weight | Growth Notes |
|---|---|---|
| Birth | 3–4 oz | Should gain ~½ oz per day |
| 4 weeks | 0.75–1 lb | Beginning to wean, starting solid food |
| 8 weeks | 1.5–2 lbs | Fully weaned, rapid growth phase begins |
| 3 months | 2.5–4 lbs | Gaining ~1 lb per month |
| 6 months | 5–7 lbs | About 75% of adult weight. Growth slowing. |
| 12 months | 8–11 lbs | Most breeds near full adult weight |
| 18–24 months | 8–12 lbs | Full adult size for most breeds |
For breed-specific kitten growth tracking, try our How Big Will My Cat Get? guide. To check if your cat's current weight is healthy, use our Cat BMI Calculator for a body condition score assessment. For calorie needs at any weight, see the Cat Calorie Calculator.
FAQs
Ideal weight ranges vary significantly by breed. Each breed has natural size variations, so ideal weight is expressed as a range rather than a single number. Our calculator uses breed-specific standards to provide accurate weight ranges.
Compare your cat's current weight to the ideal weight range for their breed using our calculator. You can also use our Cat BMI Calculator to assess body condition, as Body Condition Score (BCS) is often more reliable than weight alone.
If your cat is underweight, consult your veterinarian immediately. Underweight cats may have underlying health issues that need to be addressed. A veterinarian can help create a safe weight gain plan and rule out medical causes.
If your cat is overweight, consult your veterinarian for a weight loss plan. They may recommend a calorie-restricted diet and increased exercise. You can also use our Cat Weight Loss Calculator to create a personalized weight loss plan.
For mixed breed cats, select the breed that most closely matches your cat's size and build. If unsure, consult your veterinarian. Body Condition Score (BCS) assessment may be more helpful than breed-specific weight ranges for mixed breeds.
A weight calculator compares your cat's weight to breed standards, while a BMI calculator assesses body condition using visual and tactile assessment (Body Condition Score). Both tools provide valuable information, and using them together gives the most complete picture of your cat's health.
A healthy domestic shorthair typically weighs 8–11 lbs (3.5–5 kg). Males tend to be heavier (9–12 lbs) than females (7–10 lbs). However, body frame size varies, so a body condition score assessment alongside weight gives a more complete picture.
Most cats reach their full adult weight by 12–18 months. However, larger breeds like Maine Coons may continue growing until 3–4 years old. Siamese and other Oriental breeds typically reach full size by 12 months. Use breed-specific growth charts for the most accurate expectation.
Weigh your cat monthly for routine health monitoring, or weekly if they're on a weight loss or gain program. Use the same scale at the same time of day for consistency. A change of more than 0.5 lb in a month warrants a vet visit.
Weight loss despite normal appetite can indicate hyperthyroidism, diabetes, kidney disease, intestinal parasites, or dental pain. This is especially common in cats over 10 years old. If your cat is losing weight while eating normally, consult your veterinarian promptly.
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