Cat Size Calculator - Will Your Kitten Be Small, Medium, or Big?
Curious about how big your adorable kitten will grow? Our cat size calculator uses your cat's current weight and age to predict their adult size category. Whether you're planning for the future or just having fun with friends, this tool gives you a glimpse into your feline's growth potential. Try Catculator to discover if your kitten will become a petite, medium, or magnificently large cat!

Cat size prediction is both an art and a science. While genetics play the primary role in determining your cat's adult size, growth patterns during kittenhood can provide valuable clues about their final dimensions. Understanding your cat's potential size helps with planning everything from carrier purchases to home space requirements.
The cat size calculator analyzes your kitten's current weight relative to their age, comparing it against typical growth curves to estimate whether they'll develop into a small, medium, or large adult cat. This prediction tool considers the rapid growth phases that occur during the first year of a cat's life, when most of their adult size is determined.
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How to use the cat size calculator
Using the cat size calculator is simple and requires just two key measurements that any cat owner can easily obtain:
- Weigh your cat: Use a digital scale to get your cat's current weight. For kittens, a kitchen scale often works well. Record the weight in pounds or kilograms, whichever you prefer.
- Determine your cat's age: Enter your cat's age as accurately as possible. For kittens under one year, precision in weeks or months is important for accurate predictions.
- Get your prediction: The calculator will analyze this data against growth curves and provide a size category prediction along with a numerical score.
- Share the results: Found out your kitten will be a gentle giant? Share the exciting news with friends and family directly from the app!
How can Catculator help?
Catculator's Cat Size Calculator makes predicting your feline's adult size both fun and informative. Simply input your cat's current weight and age, and the app generates a size prediction complete with a detailed breakdown of whether your cat will likely be small, medium, or large when fully grown.
The app goes beyond just giving you a prediction - it provides a shareable result that you can send to friends, family, or fellow cat enthusiasts. Whether you're excited about your kitten's potential size or want to settle a friendly debate about how big your cat will get, the built-in sharing feature makes it easy to spread the news. The results include both the size category and a numerical score, giving you specific details to discuss and compare.
Understanding cat size categories
Cat size categories help provide context for your pet's predicted adult dimensions. Small cats typically weigh between 5-8 pounds when fully grown and include many domestic shorthairs and petite breeds. These compact felines are often agile and energetic, making them perfect for apartment living and small spaces.
Medium cats usually range from 8-12 pounds and represent the most common size category for domestic cats. These cats strike a balance between being substantial enough to feel sturdy while remaining manageable for most living situations. Many popular breeds fall into this category, including most mixed-breed house cats.
Large cats typically weigh 12+ pounds when healthy and fully grown. These impressive felines often have sturdy builds and commanding presence. Breeds like Maine Coons, Ragdolls, and Norwegian Forest Cats commonly fall into this category. Large cats may require bigger carriers, more spacious litter boxes, and sturdier cat furniture.
Remember that these predictions are estimates based on typical growth patterns. Individual cats may vary due to genetics, nutrition, and health factors. Use Catculator as a fun way to anticipate your cat's growth journey and share the excitement with other cat lovers!