Guide
Cat weight chart by age
How much should your cat weigh? Use the chart for a healthy range at every age, then confirm with the hands-on body condition check — it’s what vets rely on.
Sourced from WSAVA, Cornell Feline Health Center · updated 2026-09-29Weight by age (domestic shorthair)
| Age | Kilograms | Pounds |
|---|---|---|
| Newborn | 0.09–0.11 kg | 0.2–0.2 lb |
| 1 week | 0.15–0.2 kg | 0.3–0.4 lb |
| 2 weeks | 0.2–0.3 kg | 0.4–0.7 lb |
| 4 weeks | 0.35–0.45 kg | 0.8–1.0 lb |
| 8 weeks | 0.7–1 kg | 1.5–2.2 lb |
| 12 weeks | 1.2–1.6 kg | 2.6–3.5 lb |
| 4 months | 1.6–2.3 kg | 3.5–5.1 lb |
| 6 months | 2.3–3.2 kg | 5.1–7.1 lb |
| 9 months | 2.7–3.6 kg | 6.0–7.9 lb |
| 12 months | 3.2–4.5 kg | 7.1–9.9 lb |
| Adult (1–10 yrs) | 3.6–4.5 kg | 7.9–9.9 lb |
| Senior (11+ yrs) | 3.2–4.5 kg | 7.1–9.9 lb |
Visual range, 0–5 kg
Adult weight by breed size
| Size | Example breeds | kg | lb |
|---|---|---|---|
| Small | Singapura, Devon Rex, Cornish Rex | 1.8–3.6 | 4.0–7.9 |
| Medium | Domestic Shorthair, Siamese, Abyssinian | 3.6–5 | 7.9–11.0 |
| Large | British Shorthair, Ragdoll, Norwegian Forest | 4.5–7 | 9.9–15.4 |
| Extra large | Maine Coon, Savannah (F1–F3) | 5.5–9 | 12.1–19.8 |
Body condition score (BCS)
Vets score cats from 1 (emaciated) to 9 (obese); 5 is ideal. Each point above 5 is roughly 10% extra body weight.
- 1 · Emaciated: Ribs, spine and hips visible from a distance; no fat.
- 3 · Thin: Ribs easily felt with minimal fat; obvious waist.
- 5 · Ideal: Ribs felt under a light fat layer; waist visible behind ribs; small belly pad.
- 7 · Overweight: Ribs hard to feel; waist barely visible; rounded belly.
- 9 · Obese: Ribs can’t be felt; heavy fat over spine, face and limbs; no waist.
Frequently asked
How much should a cat weigh?
Most domestic shorthair adults weigh 3.6–4.5 kg (8–10 lb). Large breeds like Maine Coons can healthily weigh much more — body condition matters more than the number.
How much should a kitten weigh?
A rough rule is about 0.45 kg (1 lb) per month of age up to about 5–6 months. Newborns weigh around 100 g and should roughly double that in the first week.
How do I know if my cat is overweight?
Run your hands along the ribs: you should feel them easily under a thin layer of fat, and see a waist from above. That’s a body condition score of 5/9.