Pets & Animals
Calculators for pet owners: dog and cat food portions, puppy adult weight, aquarium stocking, water intake and medication dosage by body weight, with the formulas shown.
Aquarium Heater Wattage Calculator
Estimate the heater wattage your fish tank needs from its size and how far above room temperature you heat. Uses the watts per gallon guideline.
Aquarium Salt Mix Calculator
Estimate how much marine salt to mix for a target salinity. Enter gallons and a specific gravity to get grams, kilograms and pounds of salt.
Aquarium Stocking Calculator
Estimate how many inches of fish your tank holds or what tank size your fish need. Uses the inch per gallon guideline for fresh or saltwater.
Aquarium Tank Weight Calculator
Estimate the filled weight of a fish tank from its size, glass, substrate and rock. Get pounds and kilograms for fresh or saltwater setups.
Aquarium Water Change Calculator
Work out how much water to swap in a partial aquarium water change. Enter your tank size and change percent to get gallons and liters to replace.
Cat Food Portion Calculator
Estimate how many calories and how much food your cat needs daily. Enter weight, activity factor and food calories per cup or can for a portion.
Dog Food Portion Calculator
Estimate how many calories and cups of food your dog needs each day. Enter weight, activity factor and food calories per cup to get a daily portion.
Dog Water Intake Calculator
Estimate how much water your dog should drink each day from its weight. Get a target in ounces, milliliters and cups using the 1 oz per pound rule.
Pet Medication Dosage Calculator
Estimate a weight-based medication dose for a pet in mg and mL. Informational only, not vet advice. Always confirm the dose with your veterinarian.
Puppy Weight Calculator
Estimate your puppy adult weight from its current weight and age in weeks. A quick linear projection that gives a rough ballpark by breed size.