From cat age in human years to daily calorie needs, ideal weight, pregnancy timelines and medication dosages — all 35+ free cat calculators in one place. Vet-informed. No sign-up. No ads.
Start with the tools cat owners use most — quick, accurate, and always free.
Convert your cat's age to human years with breed-adjusted accuracy. More precise than the old "cat years" rules.
Calculate your cat's exact daily calorie needs using vet-standard RER and MER formulas.
Get the exact daily feeding amount for your cat based on weight, age, activity level, and food type.
Every free cat calculator organized by category. Tap any card to start instantly.
Cat years to human years by breed and size
Try it →Estimate your cat's lifespan by breed and health
Try it →Track kitten growth milestones week by week
Try it →When does your cat officially become a senior?
Try it →Find your cat's exact age down to the day
Try it →Is your cat overweight? Check body mass index
Try it →Target weight range for your cat's breed and frame
Try it →Predict your kitten's adult weight by breed
Try it →Vet-standard 9-point body condition assessment
Try it →Safe calorie-restricted plan for overweight cats
Try it →Compare growth to breed averages month by month
Try it →Daily feeding amount by weight, age & food type
Try it →Resting & maintenance energy requirements (RER/MER)
Try it →How much water should your cat drink daily?
Try it →Balance wet and dry food portions for optimal health
Try it →Safe daily treat allowance by weight & calories
Try it →Cat medication dosage by weight (verify with vet)
Try it →Dewormer dosage and schedule by cat weight
Try it →Safe Benadryl dose for cats by weight
Try it →Methimazole dose for hyperthyroid cats by weight
Try it →Prednisolone dose for cats by weight and condition
Try it →Gabapentin dose for cats (pain & anxiety relief)
Try it →Core and non-core vaccination timeline by age
Try it →Trusted by thousands of cat owners for accurate, vet-informed calculations.
Every calculation uses evidence-based formulas reviewed by licensed veterinarians, updated with current feline research.
Zero sign-ups, no email collection, no paywalls. Every tool is 100% free, forever, for every cat owner everywhere.
Breed-specific data for over 90 cat breeds delivers far more accurate results than generic one-size-fits-all calculators.
Fully optimized for mobile, tablet, and desktop. Get answers about your cat anytime, anywhere, in seconds.
Common questions about cat calculators and using our free tools.
Our cat age calculator uses an updated conversion that reflects how cats actually age: rapidly in their first two years (year 1 ≈ 15 human years, year 2 ≈ 24), then 4 human years per cat year after that. This is more accurate than the old rule-of-thumb. Breed and indoor/outdoor lifestyle affect aging, which our calculator accounts for.
A healthy adult cat typically needs 20–33 kcal per pound of body weight per day. The exact amount depends on their age, weight, whether they're spayed/neutered, indoor vs outdoor, and activity level. Use our Cat Calorie Calculator to get a personalized RER/MER figure for your specific cat.
The serving size depends entirely on the caloric density of the specific food you're using. Wet food averages 25–30 kcal/oz; dry food averages 300–400 kcal/cup. Use our Cat Food Calculator — enter your food's kcal/serving and your cat's details to get an exact daily portion with wet/dry balance options.
Cat gestation is approximately 63–65 days (about 9 weeks) from conception. The range is typically 58–72 days. Most queens give birth right around 65 days. Use our Cat Pregnancy Calculator to find your expected kittening date and week-by-week development milestones.
Most domestic cats are healthy at 8–10 lbs (3.6–4.5 kg), but this varies widely by breed. Maine Coons and Ragdolls can be healthy at 12–18 lbs. A more useful measure than weight alone is the Body Condition Score. Use our Cat Ideal Weight Calculator and Cat BMI Calculator for breed-specific targets.
No — our calculators provide informational estimates only. They're excellent for tracking trends, planning feeding routines, and preparing for vet visits, but never replace your veterinarian's hands-on examination and professional judgment. Always consult your vet for medical decisions, medication dosages, and any health concerns about your cat.
Start with the most popular cat tool — it takes under 30 seconds and you'll never need to sign up.