Kitten Weight Chart
Check if your kitten is growing at a healthy rate with our week-by-week weight chart. Enter current weight and age for an instant assessment.
On track
Current weight
800 g
(28.2 oz)
Expected range
700–950 g
(24.7–33.5 oz)
Growth reference chart
| Age | Expected weight (g) | In oz |
|---|---|---|
| Week 1 | 90–170 g | 3.2–6 oz |
| Week 2 | 170–290 g | 6–10.2 oz |
| Week 3 | 280–400 g | 9.9–14.1 oz |
| Week 4 | 350–500 g | 12.3–17.6 oz |
| Week 6 | 550–750 g | 19.4–26.5 oz |
| Week 8 | 700–950 g | 24.7–33.5 oz |
| Week 10 | 900–1200 g | 31.7–42.3 oz |
| Week 12 | 1000–1400 g | 35.3–49.4 oz |
| Week 16 | 1500–1900 g | 52.9–67 oz |
| Week 20 | 1800–2400 g | 63.5–84.7 oz |
| Week 24 | 2000–2800 g | 70.5–98.8 oz |
| Week 32 | 2400–3200 g | 84.7–112.9 oz |
| Week 40 | 2600–3500 g | 91.7–123.5 oz |
| Week 52 | 2800–4500 g | 98.8–158.7 oz |
How fast should a kitten grow?
Healthy kittens gain approximately 10–15 grams per day (about 0.5 oz/day) for the first several weeks of life. A rough rule: kittens should weigh about 100g (3.5 oz) at birth, doubling in weight by 2 weeks, and reaching approximately 1 kg (2.2 lbs) by 8–10 weeks. Daily weighing with a kitchen scale is the most reliable early health check — weight loss or failure to gain for more than 24 hours in a neonatal kitten is a veterinary emergency.
What causes slow growth in kittens?
Fading kitten syndrome refers to neonates who fail to thrive in the first few weeks. Causes include low birth weight, inadequate milk intake, hypothermia, infection, parasites, or congenital abnormalities. For older kittens, intestinal parasites (roundworms, hookworms, giardia) are the most common cause of poor growth — nearly all kittens carry roundworms from their mother, which is why deworming at 2, 4, 6, and 8 weeks is standard protocol. Nutritional deficiencies from poor-quality food or improper weaning can also stunt growth.
When kittens reach full size
Most domestic cats reach their adult weight between 12 and 18 months. The average domestic shorthair weighs 8–10 lbs at maturity. However, larger breeds take much longer: Maine Coons and Norwegian Forest Cats continue growing until age 3–4 and routinely reach 15–20+ lbs. Male cats are typically 20–30% heavier than females of the same breed. Spaying or neutering before full skeletal maturity can slightly increase adult body size, as sex hormones signal the growth plates to close.
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