Cat Calculators
Free cat calculators using AAHA/AVMA feline life-stage guidelines: age, pregnancy, calories and more.
- Cat Age CalculatorConvert your cat's age to human years using the official AAHA/AVMA Feline Life Stage Guidelines. Indoor vs outdoor lifespan compare.ageOpen
- Cat Pregnancy CalculatorEstimate your queen cat's due date (63–67 day gestation) with a weekly tracker, vet milestones and kittening-box prep timing.pregnancyOpen
- Cat Calorie CalculatorCalculate daily kcal for your cat using the RER formula with neutered/intact, kitten, senior and BCS adjustments. AAFP life-stage based.nutritionOpen
- Cat Litter CalculatorCalculate how much cat litter you need per month for 1–5 cats. Supports clay, clumping, crystal and pine substrates.suppliesOpen
- Cat Water Intake CalculatorCalculate your cat's daily water needs based on weight and diet (wet vs dry). Dehydration warning signs and prevention tips.healthOpen
- Kitten Weight ChartCheck if your kitten's weight is on track. Shows expected weight by age in weeks from birth to 12 months with flags for underweight/overweight.growthOpen
- Cat Dewormer Dosage CalculatorCalculate the correct dewormer dose for cats by weight. Supports pyrantel pamoate, praziquantel and fenbendazole.dosageOpen
- Cat Carrier Size CalculatorSize your cat's carrier correctly. Meets IATA pet travel requirements: cat must stand, turn and lie down. Airline cabin-size filtering.equipmentOpen
- Cat Insulin Dosage CalculatorCalculate starting insulin dose for diabetic cats. AAHA guideline: 0.25 U/kg BID glargine or PZI, rounded down.dosagediabetesOpen
- Onion/Garlic Toxicity CalculatorAssess the risk if your cat ate onion, garlic, leek or chive. Cats are 3-5× more sensitive than dogs; even small amounts cause Heinz-body anemia.emergencyOpen
- Acetaminophen Toxicity (Cat)Cat Tylenol toxicity calculator. NO safe dose in cats — 10 mg/kg can cause methemoglobinemia. Emergency contact included.emergencyOpen
- Cat Weight ChartCheck your cat's weight against age-based expected ranges from kitten (oz) through adult and senior (lb). Breed-adjusted charts.weightOpen
- Spay/Neuter Recovery TrackerTrack your cat's recovery after spay/neuter surgery with a day-by-day timeline. When to remove cone, expected healing milestones, red-flag warning signs.surgeryOpen
- Maine Coon Weight ChartMaine Coon growth chart month-by-month. Largest domestic cat breed — males 15-25 lb, females 10-15 lb. Fully grown at 3-5 years (later than most breeds).breedgrowthOpen
- Siamese Weight ChartSiamese cat weight chart. Slender active breed — males 8-10 lb, females 6-8 lb. Common misdiagnosis: 'underweight' because of slim build.breedgrowthOpen
- Ragdoll Weight ChartRagdoll cat growth chart. Large breed — males 15-20 lb, females 10-15 lb. Slow maturity: fully grown at 4 years.breedgrowthOpen
- Persian Weight ChartPersian cat weight chart. Medium breed 7-12 lb. Prone to weight gain due to low activity; brachycephalic airway requires lean condition.breedgrowthOpen
- Bengal ExerciseBengal cats need 30-60 min active play + climbing + puzzle feeders. Highest-activity domestic cat breed — ignoring enrichment causes behavioral problems.breedactivityOpen
- Kitten Vaccine ScheduleGenerate kitten vaccine schedule from DOB. FVRCP at 6-8, 10-12, 14-16 weeks; rabies at 16 weeks. AAFP 2020.healthOpen
- Cat Litter by HouseholdMonthly litter needs and cost for 1-6 cats across 6 litter types. Includes Humane Society n+1 box rule and type-specific recommendations.costlitterOpen
About cats in the United States
Cats occupy 37% of US households — about 49 million cats total. Feline care has unique quirks: obligate carnivore metabolism, hidden diseases (CKD, HCM, hyperthyroidism), and dramatic behavior changes tied to environment. Our cat calculators are built around the AAHA/AAFP 2021 feline life-stage guidelines and peer-reviewed feline research.
What's unique about cat care calculations?
Cats mature faster than dogs (full adult by year 2), age slower after (4 human years per cat year), and are obligate carnivores — they cannot digest plant-based diets safely. They also need far less exercise than dogs but demand more environmental enrichment.
Indoor vs outdoor cats
Indoor cats average 13–17 years of life; outdoor cats 5–10. The difference is overwhelmingly caused by traffic, predators, and infectious disease (FIV, FeLV). Every FurCalc cat tool defaults to 'indoor' lifestyle assumptions.
Cat calculator FAQ
How do I convert my cat's age to human years?
Use our cat age calculator — AAHA 2021 formula: year 1 = 15 human years, year 2 adds 9 more (total 24), each year after adds 4.
Is there a calculator for my specific cat breed?
We have breed-specific weight charts for Maine Coon, Siamese, Ragdoll, Persian plus exercise/enrichment for Bengal. Other breeds fit the generic calculators well.
How accurate are these calculator results?
Our calculators implement the exact formulas used in veterinary textbooks, AAFCO/NRC nutrition standards, AAHA/AAFP life-stage guidelines, and peer-reviewed research. Results are accurate within the precision of the input data. For medical decisions (toxicity, drug dosing, diabetic insulin), always confirm with your veterinarian — calculators are educational tools, not clinical devices.