PawsMathFree calculators for dog and cat owners
How much should she eat? How old is he in human years? When are the puppies due, and is the chocolate he just stole going to be a problem? Pick a calculator below and get an answer in a few seconds.
Pet ate something toxic? Use the chocolate or xylitol calculator, and call your vet or ASPCA Animal Poison Control at (888) 426-4435 right away.
Dog calculators
Dog Age Calculator
Convert your dog's age to human years by size, plus the DNA-based formula.
Dog Food Calculator
Daily calories and cups of food based on weight, age and activity.
Puppy Weight Calculator
Estimate how big your puppy will be as an adult.
Dog Chocolate Toxicity Calculator
Check how dangerous the chocolate your dog ate could be.
Dog Xylitol Toxicity Calculator
Estimate the risk from sugar-free gum, candy or peanut butter.
Dog Pregnancy Calculator
Whelping due date and week-by-week pregnancy timeline.
Dog Water Intake Calculator
How much water your dog should drink each day.
Dog Weight Loss Calculator
Safe calorie target and timeline to reach ideal weight.
Raw Dog Food Calculator
Daily raw portion and 80/10/10 meat, bone and organ split.
Dog Treat Calculator
How many treats fit the 10% rule for your dog.
Dog Crate Size Calculator
Find the right crate size from your dog’s measurements.
Cat & general calculators
Cat Age Calculator
Convert your cat's age to human years and life stage.
Cat Food Calculator
Daily calories, dry cups and wet cans for your cat.
Cat Pregnancy Calculator
Kittens due date and pregnancy milestones.
Cat Water Intake Calculator
Daily water needs, counting the moisture in wet food.
Pet Cost Calculator
Yearly and lifetime cost of owning a dog or cat.
Pet care guides
Dog Body Condition Score: How to Tell if Your Dog Is Overweight
A hands-on guide to the 9-point body condition score, with what to feel for and what to do next.
Toxic Foods for Dogs: What Not to Share From Your Plate
The common human foods that can poison dogs, why they are dangerous and what to do if your dog eats one.
Signs Your Dog Is Going Into Labor (and When to Call the Vet)
The three stages of whelping, the temperature drop, normal timings and the warning signs of trouble.
How to Get Your Cat to Drink More Water
Why cats drink so little, how much is enough and practical ways to raise their water intake.
How these calculators work
Most pet questions come down to a bit of math. How much a dog should eat depends on its resting energy requirement, a formula vets have used for decades. Whether a chocolate bar is dangerous depends on the dog's weight and how much theobromine is in that kind of chocolate. We take those formulas and published thresholds, show you the working, and link to the sources at the bottom of each page.
Everything runs in your browser, so nothing you type is sent anywhere and there's nothing to sign up for. The results are estimates for healthy animals, though. If your pet is ill, pregnant, on medication or has eaten something it shouldn't, your vet is the one to call.