Useful planning
Estimate enclosure sizes, cage dimensions, filter flow, food portions, water intake, and costs before buying supplies.
Free pet calculators
Pet Calculators
Practical pet math tools for owners planning reptile enclosures, bird cages, aquariums, small-pet housing, food portions, water intake, exercise, age milestones, and pet insurance decisions.
What you can plan here23 calculators, each with its own route.
Every calculator shows the formula, notes, related tools, FAQs, and sources. Results run in your browser and are built for planning conversations, product comparisons, and care research.
All pet calculators
Search or browse by category. Each tile links to a focused calculator page with its own SEO-friendly route.
Exotics & Aquariums
Reptile Enclosure Size CalculatorEstimate minimum and recommended reptile enclosure dimensions from species, body length, lifestyle, age, and animal count.Bird Cage Size Calculator by SpeciesEstimate cage dimensions, bar spacing, and perch planning for common pet birds.Aquarium Heater Wattage CalculatorEstimate heater wattage for freshwater or saltwater tanks from volume, room temperature, and target temperature.Aquarium Filter GPH CalculatorEstimate filter flow range and turnover rate for freshwater tanks, planted tanks, cichlids, and goldfish.Betta Tank Size & Setup CalculatorPlan betta tank size, heater wattage, filter flow, and common setup warnings.Reptile UVB Bulb Replacement CalculatorEstimate when to replace reptile UVB bulbs from bulb type, daily schedule, and time installed.
Dogs & Cats
Cat & Dog Calorie Needs CalculatorEstimate daily calories with RER and MER formulas for cats and dogs.Puppy Adult Weight PredictorEstimate a puppy's adult weight range from current age, current weight, and size class.Litter Box CalculatorEstimate how many litter boxes a household needs and how much litter to budget each month.Cat Age CalculatorConvert cat age into a human-year equivalent and life stage.Dog Age Calculator by BreedConvert dog age into a human-year equivalent using breed or size class.Dog Food Portion CalculatorEstimate dog daily calories, cups per day, meals, and treat allowance.Cat Food Portion CalculatorEstimate cat daily calories, dry cups, wet cans, mixed feeding, and treat allowance.Ideal Dog Weight Calculator by BreedCompare current weight with a broad breed or size-based dog weight range.Ideal Cat Weight Calculator by BreedCompare current weight with a broad cat breed weight range.Dog Crate Size CalculatorEstimate dog crate length, height, width, and nearest standard crate size.Dog Water Intake CalculatorEstimate dog daily water intake from weight, activity, food type, weather, and nursing status.Cat Water Intake CalculatorEstimate cat daily water intake from weight, food type, age, and health flags.Dog Exercise Needs CalculatorEstimate dog exercise minutes per day by breed group, age, fitness, and weather.Puppy & Kitten Feeding ScheduleEstimate meals per day and calories per meal for puppies and kittens by age and weight.
Small Pets & Planning
Rabbit Hutch Size CalculatorEstimate rabbit living space, exercise pen needs, height, and litter box count.Guinea Pig Cage Size CalculatorEstimate guinea pig cage square footage and common C&C grid layouts.Pet Insurance Breakeven CalculatorCompare pet insurance premiums, deductibles, reimbursement, and expected vet costs.
Why use Pet Calculators?
These tools are built for useful estimates, clear formulas, and search-friendly pages that still respect pet-care risk.
Visible math
Calculator pages show formulas, assumptions, examples, FAQs, and sources so the result is easy to inspect.
Careful disclaimers
Health-adjacent pages clearly say they are not veterinary advice and point you back to qualified guidance.