Free Cat Calculators
& Health Tools
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.
Most Popular Cat Calculators
Start with the tools cat owners use most — quick, accurate, and always free.
Cat Age Calculator
Convert your cat’s age to human years with breed-adjusted accuracy. More precise than the old “cat years” rules.
Cat Calorie Calculator
Calculate your cat’s exact daily calorie needs using vet-standard RER and MER formulas.
Cat Food Calculator
Get the exact daily feeding amount for your cat based on weight, age, activity level, and food type.
All Cat Calculators & Tools
Every free cat calculator organized by category. Tap any card to start instantly.
Age & Life Stage
3 toolsHealth & Weight
5 toolsCat BMI Calculator
Is your cat overweight? Check body mass index
Try it →Kitten Weight
Predict your kitten’s adult weight by breed
Try it →Body Condition Score
Vet-standard 9-point body condition assessment
Try it →Weight Loss Plan
Safe calorie-restricted plan for overweight cats
Try it →Cat Growth Chart
Compare growth to breed averages month by month
Try it →Nutrition & Feeding
5 toolsCat Food Calculator
Daily feeding amount by weight, age & food type
Try it →Cat Calorie Calculator
Resting & maintenance energy requirements (RER/MER)
Try it →Water Intake
How much water should your cat drink daily?
Try it →Wet vs Dry Food
Balance wet and dry food portions for optimal health
Try it →Cat Treat Calculator
Safe daily treat allowance by weight & calories
Try it →Breeding & Reproduction
4 toolsMedical & Dosage
7 toolsMedication Dosage
Cat medication dosage by weight (verify with vet)
Try it →Chocolate Toxicity
Is chocolate toxic to your cat? Dose by weight & type
Try it →Benadryl for Cats
Safe Benadryl dose for cats by weight
Try it →Flea Treatment
Pick the right flea product & dose by weight
Try it →Prednisolone Dosage
Prednisolone dose for cats by weight and condition
Try it →Gabapentin Dosage
Gabapentin dose for cats (pain & anxiety relief)
Try it →Vaccine Schedule
Core and non-core vaccination timeline by age
Try it →Behavior & Wellness
4 toolsWhy Pet Calculator Hub?
Trusted by thousands of cat owners for accurate, vet-informed calculations.
Vet-Informed Formulas
Every calculation uses evidence-based formulas reviewed by licensed veterinarians, updated with current feline research.
No Account Required
Zero sign-ups, no email collection, no paywalls. Every tool is 100% free, forever, for every cat owner everywhere.
90+ Breed Data
Breed-specific data for over 90 cat breeds delivers far more accurate results than generic one-size-fits-all calculators.
Works on Any Device
Fully optimized for mobile, tablet, and desktop. Get answers about your cat anytime, anywhere, in seconds.
Frequently Asked Questions
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.