Pet Calculators: Care, Feeding and Health Tools for Your Pets

Whether you share your home with a dog, cat, bird, or small animal, our pet calculators take the guesswork out of everyday care. Estimate how much food your pet needs each day, convert your dog's age into human years, check if your pet's weight is in a healthy range, or work out the right portion sizes for puppies and kittens as they grow.

These tools are made for pet owners, breeders, and anyone planning to welcome a new animal into the family. Each calculator is free, requires no registration, and gives instant results so you can make confident decisions about feeding, weight management, and daily routines for your companion.

Cat Litter

Estimate how much cat litter you need per fill, per full change, and per month. Enter your box dimensions, fill depth, litter density and how often you empty the box.

Pet Water Intake

Estimate how much water your dog or cat needs each day based on body weight and wet food moisture. Enter your pet's species, weight and diet to see the daily drinking water range.

Pet Food Transition

Plan a safe, gradual switch from your pet's old food to a new one. Enter the daily food amount, start date and transition length, and get a day-by-day mixing schedule that can also keep calories constant.

Pet Feeding Schedule

Enter your pet's daily food allowance, how many meals you serve, the first meal time and the feeding window — the calculator splits the food into even portions and gives you a complete daily meal schedule.

Cow Gestation

Estimate a cow's calving date from the breeding or insemination date, or work backwards from a calving date. Choose a breed preset (Angus, Holstein, Jersey and more) and get the calving window, trimester and key management dates such as pregnancy check and dry-off.

Dog Chocolate Toxicity

Estimate your dog's risk after eating chocolate. Enter your dog's weight, the type of chocolate and the amount eaten to get the methylxanthine dose, risk level and advice on what to do next.

Pet Ideal Weight

Estimate your dog's or cat's ideal weight from its current weight and a 9-point body condition score. Enter both values to get a target weight range and the amount to lose or gain.

Cat Calories

Estimate how many calories your cat needs per day based on weight, life stage and activity, and see exactly how many cups, cans or grams of food that equals.

Dog Calories

Estimate your dog's daily calorie needs (RER and MER) from weight, life stage and activity, and see exactly how many servings of food to give per day and per meal.

Cat Age

Convert your cat's age to human years using the AAHA/AAFP guidelines: the first year equals 15 human years, the second adds 9, and each following year adds 4. Enter years and months or a birth date, and get the life stage and typical life expectancy too.

Puppy Weight

Estimate your puppy’s adult weight, growth progress, and projected weight by month. Enter their current weight and age in weeks, then choose an expected adult size or leave it as Unknown.

Pet Pregnancy Due Date

Estimate your pet's due date based on the mating or ovulation date and species. Get the most likely delivery date plus the earliest and latest likely dates for dogs, cats, rabbits and guinea pigs.

Dog Age

Convert your dog's age to human years with the AVMA/AAHA veterinary chart and a DNA-based epigenetic formula. Enter your dog's age or birth date and breed to get its human age, life stage and typical life expectancy.

Dog Crate Size

Enter your dog's body length and standing height to find the recommended crate size, with clearance ranges for length, height and width. Works for puppies too.