Pets calculators
7 free tools
Quick, free calculators for the everyday questions pet owners actually ask — how old your dog or cat is in human years, how much to put in the food bowl, how big that puppy will get, and what size tank your fish need.
Find your fish tank's water volume in gallons and liters from its dimensions.
Turn your cat's age into human years using the standard feline aging chart.
Estimate your cat's daily calories and food from its weight and lifestyle.
Convert your dog's age into human years using the modern size-based method instead of the old times-seven rule.
Estimate how much to feed your dog each day from its weight and activity level.
Convert your horse's age into human years using the standard equine-to-human chart.
Predict your puppy's adult weight from its current age and weight, adjusted for breed size.
Frequently asked questions
Are these pet calculators accurate?
They use well-established charts and formulas, like the modern size-based dog-age method and standard resting-energy food estimates. They are solid guides, but your vet knows your specific pet best.
Why isn't one dog year seven human years?
That old rule is a myth. Dogs mature quickly in their first two years and age at a pace that depends on their size, so a size-based method is far more realistic.
How much should I feed my pet?
Start from the calculator's estimate based on weight and activity, then cross-check against the guide on your food's packaging and adjust to keep your pet at a healthy weight.