Free calculators for every pet owner. No accounts. No fees. No nonsense.
PetsCalc is a collection of 31 free, accurate calculators for dog, cat, fish, and small pet owners. Whether you need to convert your dog's age to human years, calculate the right food portions for your cat, find out how many fish fit in your aquarium, or estimate your annual pet budget — we have a tool for it.
Every calculator on PetsCalc uses established veterinary formulas and published guidelines. Our dog and cat calorie calculators use the Resting Energy Requirement (RER) formula endorsed by the American College of Veterinary Nutrition. Our dog age calculator uses breed-size adjusted aging tables rather than the outdated "multiply by 7" rule.
All calculations happen entirely in your browser. Nothing is stored or sent to a server. Your inputs are private.
PetsCalc is supported by Google AdSense advertising and affiliate partnerships with Chewy and pet insurance providers. When you shop through our affiliate links, we earn a small commission at no cost to you. This model lets us keep all tools 100% free and without a paywall.
Our calculators are for informational purposes and provide general guidance. They are not a substitute for professional veterinary advice. Always consult your veterinarian for your pet's specific health, nutrition, and medication needs.
Found an error or have a tool suggestion? Email us at: hello@petscalc.com