How Much Should a Kitten Weigh? A Week-by-Week Guide
Published by MaunaPet. Editorial policy and sources.
A healthy newborn kitten weighs about 85–115 g and gains roughly 10–15 g a day in the first weeks. From 2 to 6 months, most kittens put on around 0.4–0.5 kg (about 1 lb) a month. The ranges below are the ones used by our interactive kitten weight chart for average-sized cats.
Kitten weight chart by age
| Age | Typical weight | In pounds or ounces |
|---|---|---|
| Newborn | 85–115 g | 3–4 oz |
| 1 week | 150–250 g | 5–9 oz |
| 2 weeks | 200–330 g | 7–12 oz |
| 3 weeks | 280–420 g | 10–15 oz |
| 4 weeks | 350–500 g | 0.8–1.1 lb |
| 6 weeks | 550–750 g | 1.2–1.7 lb |
| 8 weeks (2 months) | 750 g – 1 kg | 1.7–2.2 lb |
| 10 weeks | 900 g – 1.3 kg | 2–2.9 lb |
| 12 weeks | 1–1.5 kg | 2.3–3.3 lb |
| 13 weeks (3 months) | 1.1–1.6 kg | 2.4–3.5 lb |
| 4 months | 1.5–2.2 kg | 3.3–4.9 lb |
| 5 months | 1.8–2.7 kg | 4–6 lb |
| 6 months | 2.2–3.2 kg | 4.9–7.1 lb |
| 7 months | 2.4–3.5 kg | 5.3–7.7 lb |
| 9 months | 2.8–4 kg | 6.2–8.8 lb |
| 12 months | 3.2–4.5 kg | 7.1–9.9 lb |
How much should a 6-week-old kitten weigh?
About 550–750 g (1.2–1.7 lb). Kittens are being weaned at this age, so a short pause in weight gain can happen. A kitten that loses weight needs a vet check.
How much should an 8-week-old kitten weigh?
About 750 g – 1 kg (1.7–2.2 lb). Many shelters and breeders wait until a kitten weighs around 1 kg before rehoming.
How much should a 10-week-old kitten weigh?
About 900 g – 1.3 kg (2–2.9 lb).
How much should a 12- or 13-week-old kitten weigh?
At 12 weeks, about 1–1.5 kg (2.3–3.3 lb). At 13 weeks, or 3 months, about 1.1–1.6 kg (2.4–3.5 lb).
How much should a 6- or 7-month-old kitten weigh?
At 6 months, about 2.2–3.2 kg (4.9–7.1 lb). At 7 months, about 2.4–3.5 kg (5.3–7.7 lb). Growth slows from here, and most cats reach adult size at around 12 months.
Large breeds grow bigger and for longer
Maine Coons, Ragdolls and other large breeds sit above these ranges. Our chart applies ranges about 10% higher before 6 weeks, 20% higher from 6 to 13 weeks and 40% higher afterwards, and these breeds keep filling out until 3–4 years of age.
How to weigh a kitten at home
- Use a kitchen scale and a bowl or small box, and subtract the weight of the container.
- Weigh at the same time of day, before a meal.
- Weigh daily in the first weeks, then weekly until 6 months.
- Write every value down. The trend matters more than one number.
Underweight, overweight, or just a different build?
The scale tells half the story. You should feel the ribs easily under a thin layer of fat and see a slight waist from above. The cat body condition score tool walks you through the check. To set portions, use the cat calorie calculator, which applies 2.5 × RER up to 4 months and 2.0 × RER from 4 to 12 months.
Call your vet if: a kitten under 8 weeks does not gain weight for 24 hours or loses weight; a kitten stops eating, has diarrhoea or vomiting, or seems weak or cold; or an older kitten's weight has not changed for more than a week.
Frequently asked questions
How much should a 13-week-old kitten weigh?
Most average-sized kittens weigh about 1.1–1.6 kg (2.4–3.5 lb) at 13 weeks. Large breeds such as Maine Coons can be noticeably heavier without being overweight.
How much should an 8-week-old kitten weigh?
About 750 g – 1 kg (1.7–2.2 lb). Many shelters and breeders wait until a kitten weighs around 1 kg before rehoming.
How much weight should a kitten gain per week?
Roughly 70–100 g per week in the first weeks, which is about 10–15 g a day. Between 2 and 6 months, expect around 0.4–0.5 kg, or about 1 lb, per month.
When do kittens stop growing?
Growth slows after 6 months and most cats reach adult size at around 12 months. Large breeds such as Maine Coons and Ragdolls keep filling out until 3–4 years of age.
Sources and further reading
- VCA Animal Hospitals — Raising Kittens
- Cornell Feline Health Center — How Often Should You Feed Your Cat?
- WSAVA — Body Condition Score chart for cats (PDF)
- WSAVA — Global Nutrition Guidelines
Links checked on November 12, 2026. These sources support the topic; they do not certify this entire article. Consult your veterinarian for diagnosis and treatment.