Happy pets, smart owners
Friendly calculators for dog and cat age, feeding, water, pregnancy and pet budgets.
⭐ Featured tools
🆕 New tools
📚 Guides
🐶 Pet Age
Dog Age Calculator
Convert your dog's age into human-equivalent years using a commonly published aging formula — more realistic than the old multiply-by-seven rule of thumb.
Cat Age Calculator
Convert your cat's age into human-equivalent years using a commonly published cat aging formula that reflects cats' very rapid early-life growth curve.
🦴 Food & Water
Dog Food Calculator
Estimate your dog's daily calorie needs and cups of food from weight and life stage, using the RER × MER method vets use.
Cat Food Calculator
Estimate how many calories your cat needs a day and how much dry or wet food that means, from weight and life stage.
Pet Water Intake Calculator
Estimate how much water a dog or cat should drink each day from body weight.
🐠 Home & Budget
Aquarium Volume Calculator
Calculate the volume of a rectangular or cylindrical fish tank in US gallons and liters, plus the weight of the water.
Pet Cost Calculator
Add up the monthly and yearly costs of owning a dog or cat — food, vet, insurance, grooming and more — and see the lifetime total.
Frequently Asked Questions
Do I need to sign up or log in?
No. Every calculator works instantly without an account. A free account is only needed if you want to save results (up to 30) and see them later.
Is my data stored anywhere?
The numbers and dates you type are calculated in your browser and are not sent to us. We keep basic visit statistics (page visited, IP address, browser, time) and, if you save a result, that saved result in your account. The AI Assistant sends your question to an AI provider to answer it.
Are the results exact?
Date and age maths is exact. Money, tax and health tools are estimates based on published formulas and official tables, and are not professional advice.