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Pets & Animals Calculators

Dog and cat age conversion, food portion sizing, and pet health calculators for responsible pet care.

100 calculatorsPet age, food portions & health calculators

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Dog Age CalculatorConvert your dog's age to human years using the DNA-methylation-based formula from a 2020 aging study.Cat Age CalculatorConvert your cat's age to human years using the standard veterinary aging chart.Dog Food CalculatorCalculate your dog's daily calorie needs and food portion using veterinary resting energy requirement formulas.Pet Life Stage CalculatorFind your dog or cat's life stage (puppy/kitten, adult, mature, senior) based on age and size.

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Cat Food & Calorie CalculatorCalculate your cat's daily calorie needs and food portion using veterinary resting energy requirement formulas.
Pet Pregnancy & Gestation CalculatorEstimate your pet's due date based on mating date and species-specific gestation length.
Aquarium Volume & Fish Stocking CalculatorCalculate your aquarium's water volume from its dimensions and estimate freshwater fish stocking capacity.
Dog Daily Water Intake CalculatorEstimate how much water your dog should drink per day based on body weight.
Litter Box CalculatorCalculate how many litter boxes your household needs based on the standard veterinary behaviorist guideline.
Pet Food Cost CalculatorCalculate the daily, monthly, and yearly cost of feeding your pet based on bag price and portion size.
Aquarium Heater Wattage CalculatorEstimate the heater wattage needed for your aquarium based on tank size and desired temperature rise.
Horse Age Calculator (Horse Years to Human Years)Convert your horse's age to a human-equivalent age using a standard equine aging chart.
Rabbit Age Calculator (Rabbit Years to Human Years)Convert your rabbit's age to a human-equivalent age using a commonly cited rabbit aging chart.
Bird Cage Size CalculatorCalculate the minimum recommended cage width based on your bird's wingspan.
Dog Crate Size CalculatorCalculate the minimum crate length your dog needs based on its body measurements.
Koi & Pond Fish Feeding CalculatorCalculate how much to feed your koi or pond fish based on their total weight and water temperature.
Pet Adoption First-Year Cost CalculatorEstimate the total first-year cost of a new pet, including adoption fees, supplies, and routine vet care.
Cat Litter Cost CalculatorCalculate your monthly and yearly cat litter cost based on usage and bag price.
Small Pet Cage Size CalculatorCheck your cage's floor space against minimum size guidelines for hamsters and guinea pigs.
Pet Boarding Cost CalculatorCalculate the total cost of boarding your pet for a trip, including additional pet and service fees.
Dog Breed Size Category CalculatorFind your dog's size category (toy, small, medium, large, or giant) from its weight.
Dog Exercise Needs CalculatorEstimate your dog's recommended daily exercise time based on size and age.
Cat Scratching Post Height CalculatorCalculate the minimum scratching post height so your cat can fully stretch while scratching.
Dog Collar Size CalculatorCalculate the correct collar size from your dog's neck measurement.
Reptile Tank Size CalculatorLook up the minimum recommended enclosure size for common pet reptile species.
Aquarium Water Change CalculatorCalculate how much water to change during routine aquarium maintenance.
Pet Life Expectancy CalculatorLook up the typical life expectancy range for common pets by species and size.
Hamster Wheel Size CalculatorFind the minimum safe exercise wheel diameter for your hamster's species.
Aquarium Lighting Duration CalculatorFind the recommended daily lighting duration (photoperiod) for your aquarium type.
Litter Box Size CalculatorCalculate the minimum litter box length your cat needs based on body size.
Aquarium Filter Flow Rate CalculatorCalculate the recommended filter flow rate for your aquarium based on tank size and stocking level.
Cat Carrier Size CalculatorCalculate the minimum carrier size your cat needs to travel comfortably.
Turtle Tank Size CalculatorCalculate the minimum tank size for a pet turtle based on its shell length.
Airline Pet Carrier Size CheckerCheck if your pet carrier fits typical in-cabin airline size limits.
Rabbit Hutch Size CalculatorCalculate the minimum hutch or enclosure floor space for your rabbit based on its weight.
Dog Walking Service Cost CalculatorCalculate the monthly cost of a professional dog walking service.
Bird Perch Diameter CalculatorFind the recommended perch diameter for your pet bird species, based on healthy foot grip.
Dog Food Transition Schedule CalculatorCalculate a gradual day-by-day schedule for switching your dog to a new food.
Cat Daily Water Intake CalculatorEstimate how much water your cat should drink per day based on body weight.
Bird Cage Bar Spacing CalculatorFind the maximum safe cage bar spacing for your bird species to prevent escape or injury.
Ferret Cage Size CalculatorCalculate the minimum recommended cage size for your ferrets based on how many you have.
Cylindrical & Bowfront Aquarium Volume CalculatorCalculate the water volume of a cylindrical or bowfront-style aquarium.
Puppy Feeding Schedule CalculatorFind the recommended number of daily meals for your puppy based on age.
Pet Bird Daily Food Amount CalculatorEstimate your pet bird's daily food amount as a percentage of body weight.
Aquarium Substrate Amount CalculatorCalculate how much sand or gravel substrate you need for your aquarium's footprint and desired depth.
Horse Hay Feeding CalculatorCalculate your horse's daily hay needs based on body weight.
Backyard Chicken Feed CalculatorCalculate how much feed your backyard chicken flock needs per day, week, and month.
Puppy Socialization Window CountdownCalculate how many days remain in your puppy's critical socialization window.
Rabbit Feeding CalculatorCalculate your rabbit's daily pellet portion based on body weight.
Guinea Pig Feeding CalculatorCalculate your guinea pig's daily pellet and fresh vegetable portions.
Puppy Growth & Adult Weight PredictorEstimate your puppy's adult weight from its current weight and age using a size-adjusted growth curve.
Dog Training Treat Calorie Budget CalculatorCalculate how many training treats you can give your dog per day without exceeding the recommended 10% calorie limit.
Multi-Cat Household Resource CalculatorCalculate how many food stations, water stations, and resting spots your multi-cat household needs based on feline behaviorist guidelines.
Cat Hairball & Fiber CalculatorEstimate a daily supplemental fiber target to help reduce hairballs, adjusted for how often you brush your cat.
Pet Insurance Premium EstimatorGet an illustrative estimate of a monthly pet insurance premium based on species, size, age, and plan options.
Pet Sitter Cost CalculatorCalculate the total cost of hiring a pet sitter for drop-in visits over your trip.
Annual Cost of Pet Ownership CalculatorEstimate your pet's ongoing yearly cost, including food, routine vet care, and incidentals, after the first year.
Rabbit Litter Box Size CalculatorCalculate the minimum litter box size for your rabbit based on its weight.
Reptile Terrarium Heat Lamp Wattage CalculatorEstimate the basking heat lamp wattage needed for your reptile terrarium based on tank size and target basking temperature.
UVB Bulb Replacement Schedule CalculatorFind your reptile UVB bulb's replacement date based on bulb type and install date.
Reptile Feeding Schedule CalculatorFind the typical feeding frequency for common pet reptile species based on age.
Aquarium Bioload & Fish Compatibility CalculatorEstimate whether your fish stocking is within a reasonable bioload for your tank size, adjusted for how messy your fish species are.
Saltwater Aquarium Stocking CalculatorEstimate a conservative maximum fish stocking level for a saltwater or reef aquarium.
Planted Tank CO2 Injection Rate CalculatorEstimate dissolved CO2 concentration in a planted aquarium from pH and carbonate hardness (KH) readings.
Chicken Coop Size CalculatorCalculate the minimum coop and outdoor run space needed for your backyard chicken flock.
Livestock Feed Conversion Ratio CalculatorCalculate feed conversion ratio (FCR), the amount of feed needed per unit of weight gain for farm animals.
Chicken Egg Production Rate CalculatorCalculate your flock's hen-day egg production rate, a standard measure of laying performance.
Hamster Age Calculator (Hamster Months to Human Years)Convert your hamster's age to a human-equivalent age based on typical hamster lifespan.
Dog Airline Cargo Crate Size CalculatorCalculate the minimum crate dimensions required for air travel using IATA Live Animals Regulations sizing rules.
Cat Food Transition Schedule CalculatorCalculate a gradual day-by-day schedule for switching your cat to a new food.
Pet Medication Dosage Math CalculatorCalculate the medication amount per dose from your pet's weight and a dose rate provided by your veterinarian.
Dog Daily Walk Distance CalculatorEstimate a reasonable daily walking distance range for your dog based on size and energy level.
Dog Grooming Frequency CalculatorFind recommended bathing, brushing, and professional grooming frequency based on your dog's coat type.
Puppy Vaccination Schedule CalculatorCalculate upcoming core vaccination visit dates based on your puppy's birth date, following standard veterinary timing.
Flea & Tick Prevention Cost CalculatorCalculate the annual cost of your pet's flea and tick prevention product.
Cat Weight Loss Calorie CalculatorEstimate a safe calorie target and timeline for helping your cat reach a healthy weight.
Dog Weight Loss Calorie CalculatorEstimate a calorie target and timeline for helping your dog reach a healthy weight.
Pet Adoption Anniversary CountdownCalculate how long you've had your pet and how many days remain until their next adoption anniversary (gotcha day).
Aquarium Nitrogen Cycle Timeline CalculatorEstimate when your new aquarium's nitrogen cycle will typically complete based on your cycling method and start date.
Betta Fish Tank Size & Temperature CalculatorCheck your betta fish tank against minimum size and heating guidelines for a healthy environment.
Goldfish Tank Size CalculatorCalculate the minimum tank size for your goldfish based on type and how many you're keeping.
Hermit Crab Tank Size CalculatorCalculate the minimum terrarium size for your land hermit crabs, kept in their recommended social groups.
Dog Nail Trim Frequency CalculatorFind a recommended nail trimming frequency based on how much natural wear your dog's nails get.
Pet Dental Cleaning Cost EstimatorEstimate the total cost of a professional veterinary dental cleaning, including possible extractions.
Litter Box Scooping & Change Frequency CalculatorCalculate how often to scoop and fully change your litter boxes based on how many cats share them.
Pet Food Storage Container Size CalculatorCalculate the container capacity needed to store a full bag of dry pet food with room to spare.
Pet Vaccination Cost EstimatorEstimate the total cost of a round of core vaccinations, including the veterinary exam fee.
Bird Egg Incubation Countdown CalculatorEstimate a hatch date for bird eggs based on species and the date laying/incubation began.
Lifetime Cost of Dog Ownership CalculatorEstimate the total cost of owning a dog over its expected lifetime, combining one-time and recurring annual costs.
Multi-Pet Household Food Cost CalculatorCalculate combined monthly and yearly food costs across dogs and cats in a multi-pet household.
Puppy Teething Timeline CalculatorCalculate estimated teething milestone dates for your puppy based on birth date.
Cat Pregnancy Weight Gain CalculatorEstimate expected weight gain progress for a pregnant cat based on weeks into gestation.
Aquarium Salinity / Specific Gravity ConverterConvert hydrometer specific gravity readings to salinity (parts per thousand) for saltwater and reef aquariums.
Pond Volume CalculatorCalculate your backyard pond's water volume from surface area and average depth.
Dog Daily Protein Requirement CalculatorEstimate your dog's daily protein needs in grams based on weight and life stage.
Cat Daily Protein Requirement CalculatorEstimate your cat's daily protein needs in grams based on weight and life stage.
Horse Water Intake CalculatorEstimate your horse's daily water intake based on body weight, workload, and weather conditions.
Dog Spay/Neuter Age Guideline CalculatorLook up commonly cited spay/neuter age guidance based on your dog's expected adult size.
Rabbit Water Intake CalculatorEstimate how much water your rabbit should drink per day based on weight and diet.
Senior Pet Vet Checkup Frequency CalculatorFind out whether your pet's age qualifies it for the recommended twice-yearly senior wellness exam schedule.

About Pets & Animals Calculators

"Multiply by 7" is not how dog years actually work - these calculators use the size- and breed-aware aging curves and portion guidelines veterinary sources actually publish, not the oversimplified rules of thumb most sites still use.