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Pet & Animal Calculators

Dog, cat, horse and livestock age, food, weight and care calculators. 9 free tools that run in your browser, no sign-up needed.

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Dog Age CalculatorConvert dog years to human years by size.Cat Age CalculatorConvert cat years to human years.Dog Food CalculatorFind your dog's daily calories and cups of food from weight and life stage.Cat Food CalculatorHow much wet and dry food to feed your cat per day, from weight, life stage and activity.Aquarium Stocking CalculatorCheck how stocked your fish tank is: stocking %, bioload per species and tank size warnings.Dog Chocolate Toxicity CalculatorEstimate theobromine mg/kg and severity after a dog eats chocolate, by type, amount and weight.Dog Crate Size CalculatorRight crate size in inches and cm from your dog's length and height or breed.Dog Water Intake CalculatorDaily water need for your dog or cat in ml, ounces and cups by weight, activity and weather.Raw Dog Food CalculatorDaily raw dog food amount by weight, age and activity, split into meat, bone and organ.

About Pet & Animal Calculators

Convert a dog or cat's age into human years, estimate daily food portions and check other pet care numbers. Breed size changes how quickly dogs age, so choose the closest size for a better estimate.

Most used here: Dog Age Calculator, Cat Age Calculator and Dog Food Calculator.

Using pet calculators

These calculators turn general veterinary rules of thumb into numbers for your pet: age in human years, daily food and water amounts, crate size and how dangerous a piece of chocolate could be. Results depend on the inputs, so use your pet's current weight and the calorie information printed on its food.

When to call a vet

Feeding and water amounts are starting points; adjust them with your vet if your pet is gaining or losing weight, is pregnant, very active, elderly or has a health condition. If a dog has eaten chocolate, the toxicity calculator gives a risk estimate, but contact a vet or a pet poison helpline straight away rather than waiting for symptoms.