Pet & Animal

Calculators for pet owners — aquarium volume, feeding amounts, and habitat sizing for your furry, feathered, and finned friends.

Aquarium Calculator

Calculate aquarium volume in liters and gallons, substrate amount, heater wattage, and fish stocking capacity from tank dimensions.

Pet & Animal
Dog Age Calculator

Convert your dog's age to human years using the modern size-based formula — more accurate than the old 7× rule.

Pet & Animal
Cat Age Calculator

Convert your cat's age to human years using the AAFP veterinary formula — includes life stage classification and indoor/outdoor lifespan data.

Pet & Animal
Dog Food Calculator

Calculate daily food portions for your dog based on weight, age, activity level, and food type — with calorie and feeding schedule guidance.

Pet & Animal
Cat Food Calculator

Calculate daily food portions for your cat based on weight, age, and activity level.

Pet & Animal

Also explore our math and health calculators for more useful tools.

Math & ConversionsHealth & Fitness

Pet & Animal Calculators

Whether you are setting up a freshwater aquarium, planning a terrarium for a reptile, or calculating daily food portions for your dog, accurate measurements matter. Our pet and animal calculators help you determine the right tank volume for healthy fish keeping, estimate feeding quantities based on pet weight and activity level, and size enclosures according to species-specific guidelines from the ASPCA, AKC, and leading veterinary organizations. Each tool uses formulas recommended by pet care professionals and hobbyist communities across the United States.