British Shorthair Weight Chart by Age
Track your British Shorthair kitten's growth against global breed standards.
Save the growth curve
Want to track growth over time and receive medical alerts when weight drops?
| Age | Male avg | Female avg |
|---|---|---|
| Birth | 95 g | 95 g |
| 1 Week | – | – |
| 4 Weeks | 475 g | 475 g |
| 8 Weeks | 1075 g | 1075 g |
| 12 Weeks | 1600 g | 1600 g |
How fast should a British Shorthair kitten grow?
British Shorthairs develop compactly and robustly. The breed grows slowly, often up to 5 years. Females remain notably lighter than males — this is breed-typical and not a development issue.
When do British Shorthair cats stop growing?
British Shorthair cats typically grow for 48 months before reaching their full adult weight.
Red flags: When to worry
- Weight consistently below the curve
- Dull coat and low activity at 4 weeks
- Birth weight not doubled by week 2
- Noticeably smaller or larger kitten compared to siblings
British Shorthair weight: frequently asked questions
- How much should a newborn British Shorthair kitten weigh?
- A healthy newborn British Shorthair kitten typically weighs between 80 g and 110 g. Weigh every kitten on the same scale at the same time each day for the first two weeks — steady daily gain matters more than the absolute number.
- How much should an 8-week-old British Shorthair weigh?
- At 8 weeks most British Shorthair kittens weigh roughly 750–1400 g. The interactive chart above plots the full healthy band so you can see exactly where one kitten falls.
- How much should a 12-week-old British Shorthair weigh?
- By 12 weeks a British Shorthair kitten is usually around 1200–2000 g, with males trending toward the upper end of the range and females toward the lower end.
- When does a British Shorthair stop growing?
- A British Shorthair reaches its full adult size at about 4 years (roughly 48 months). Most visible weight gain happens in the first 12 weeks, then growth continues more slowly toward the adult frame.
- How do I track my British Shorthair kitten's growth?
- Enter a current weight in the tool above to plot it against the breed curve. To follow every weigh-in over time, felineStudio is cattery software that charts each kitten's growth, flags slow gainers automatically and keeps the full health record per cat.