Little paws. A lot of growing.
A rough puppy size estimate, early kitten weight bands and adult cat breed references, with their limits explained.
What the answer means
Start with the right weigh-in
Under 6 months, the tool uses veterinarian Sandra C. Mitchell’s PetMD rules: a small or toy puppy’s weight at 6 weeks (×4) or 8 weeks (×3), or a medium or large puppy’s weight at 4 months (×2). From 6 months it divides by the share of adult size in the American Kennel Club’s growth chart.
Keep the estimate in perspective
Breed, parents’ size, sex, health and individual growth can change the outcome. A single multiplied weight is not a validated growth curve or a confidence range.
Watch the pattern
WALTHAM’s puppy growth charts, built from 50,000 healthy dogs, track growth from 12 weeks to adulthood in 14 charts by size and sex. Plotting weights over time shows whether growth is on track; a toy dog is adult at about 1 year, a giant dog takes nearly 2.
Kitten weight chart, weeks 1 to 8
| Age | Weight (g) | Weight (oz) | Teeth | Eyes |
|---|---|---|---|---|
| Week 1 | 70–190 | 2.5–6.7 | None | Closed |
| Week 2 | 149–295 | 5.3–10.4 | None | Opening |
| Week 3 | 198–400 | 7.0–14.1 | Baby incisors | Open, blue |
| Week 4 | 247–505 | 8.7–17.8 | Baby canines | Open, blue |
| Week 5 | 296–610 | 10.4–21.5 | Baby premolars, lower jaw | Changing color |
| Week 6 | 345–715 | 12.2–25.2 | Baby premolars, upper jaw | Changing color |
| Week 7 | 394–820 | 13.9–28.9 | All baby teeth | Adult color |
| Week 8 | 443–925 | 15.6–32.6 | All baby teeth | Adult color |
From the ASPCA Kitten Age & Weight Chart (2023), which gives a range for every day: each week here runs from its first day’s low to its last day’s high. Normal kittens gain 7–15 g a day, and the ASPCA uses weight together with teeth and eyes to estimate age.
Average adult cat weight by breed
| Breed | Males | Females |
|---|---|---|
| Domestic shorthair | 8–12 lb, averaging 10 lb | |
| Maine Coon | 12–20+ lb | 10–14 lb |
| Persian | 9–14 lb | 7–11 lb |
| Siamese | 8–12 lb | 5–8 lb |
| Abyssinian | 7–10 lb | 6–8 lb |
| Bengal | 9–15 lb | 6–12 lb |
Averages from PetMD (Liz Bales, VMD; reviewed by Molly Price, DVM). Cornell’s Feline Health Center describes obesity as 20% or more above normal weight, and vets judge it on a 9-point body condition score where 4.5 to 5 is ideal.