Cat calculators
Free calculators that show the veterinary formula and source behind every number.
Cat age calculator
How old is my cat in human years?
Source: International Cat Care · AAHA/AAFP 2021
Open →Cat weight calculator
What should my cat weigh?
Source: AAHA 2021 body condition and weight table · WSAVA
Open →Cat calorie calculator
How many calories does my cat need a day?
Source: AAHA 2021 nutrition guidelines
Open →Kitten growth calculator
How big will my cat get?
Source: Journal of Feline Medicine and Surgery 2019 · ASPCA
Open →Which calculator should I use first?
- Body condition score: is your cat under, at or over its ideal weight?
- Weight calculator: from its weight and score, an estimated ideal weight.
- Calorie calculator: enter the ideal weight, not today’s, for a daily starting figure.
- Age calculator: your cat’s age in human years and its life stage.
- Kitten growth calculator: a kitten’s weight against a study’s averages, birth to 20 weeks.
Each tool gives a starting estimate from published veterinary guidance, not a diagnosis. Kittens, pregnant or nursing cats, weight-loss plans and cats with a medical condition should have targets set with a vet.