Pets & Animals Calculators
Understand and care for your pets, convert dog and cat ages to human years, work out how much to feed, plan a due date, size an aquarium or a crate, and check healthy water intake. Every tool uses a vet-sourced formula and runs entirely in your browser.
- Dog Age Calculator (Dog Years to Human Years) Enter your dog's age to see it in human years, with the modern epigenetic-clock estimate and the traditional size-based one side by side.
- Cat Age Calculator (Cat Years to Human Years) Enter your cat's age to see it in human years and its life stage, using the standard veterinary conversion.
- Dog Food Calculator (How Much to Feed) Enter your dog's weight and life stage to get its daily calorie needs, and roughly how many cups of your food that is.
- Cat Food Calculator (How Much to Feed) Enter your cat's weight and life stage to get its daily calorie needs, and roughly how much of your food that is.
- Pet Gestation Calculator (Due Date) Choose the animal and enter the breeding date to estimate the due
- Aquarium Volume Calculator Enter your tank's length, width and height to get its volume in litres and gallons, plus the real water volume after substrate and the rim.
- Pet Water Intake Calculator Enter your dog or cat's weight to estimate its healthy daily water intake, so you know what's normal and can spot changes.
- Dog Crate Size Calculator Measure your dog and get the crate length and height to look for, enough room to stand, turn around and lie down.
- Dog Chocolate Toxicity Calculator Enter the type of chocolate, how much your dog ate and its weight to estimate the theobromine dose and see the risk level, then call your vet.
- Aquarium Stocking Calculator Enter your tank size and the total adult length of your fish to see how full the tank is.
- Aquarium Heater Size Calculator Enter your tank size, room temperature and target temperature to get the recommended heater wattage.
- Puppy Weight Calculator Predict adult weight by dividing your puppy's current weight by the fraction of its adult size it has reached so far, which depends on age and breed size.
Frequently asked questions
Are these pet calculators accurate?
They use established veterinary formulas and reference data, the 2020 epigenetic dog-age study, the AAHA/AAFP cat chart, the RER/MER energy equations, and Merck gestation periods, each cited on its tool page. They give population-level estimates, not a diagnosis; your vet's advice and your pet's body condition always come first.
Is this veterinary advice?
No. These are informational tools for planning and understanding. For health decisions, feeding, weight, pregnancy or unusual changes in drinking, consult your veterinarian.
Is my data uploaded?
No. Every tool runs entirely in your browser, nothing is sent to a server, and they work offline.