Pets calculators

12 free pets tools, each with the formula and step-by-step working.

• Aquarium Stocking CalculatorHow many fish your tank can hold, with filtration and water change load.
• Aquarium Volume CalculatorTank volume, stocking level and water changes.
• Bird Cage Size CalculatorMinimum cage dimensions, bar spacing and perch count for your bird.
• Cat Age CalculatorCat years converted to human years.
• Cat Calorie CalculatorDaily calories your cat needs by weight, age and neuter status.
• Dog Age CalculatorDog years in human terms, adjusted for size.
• Dog Food CalculatorDaily calories and cups for your dog's weight.
• Dog Walk Calorie CalculatorCalories your dog burns on a walk, and how much of its daily food that is.
• Horse Weight CalculatorEstimate horse or pony weight from heart girth and body length.
• Puppy Weight CalculatorPredict your puppy's adult weight from its current age and weight.
• Rabbit Food CalculatorDaily hay, pellets and greens for a rabbit by weight and age.
• Tortoise Growth CalculatorCheck shell length against weight with the Jackson ratio for health.

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