Pet Calculator Kit

Pet Calculator Kit: free dog & cat calculators

Free calculators for puppy growth, dog and cat calories, dog and cat years, dog size and dog pregnancy due dates. Each one shows its formula and sources, works in lb or kg, and runs in your browser.

Every result is an estimate, not veterinary advice. Ask your vet before changing your pet’s diet.

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My pet is a
Age

Pick a pet and an age to get a suggestion.

Dog calculators

Puppy weight calculatorHow big will my puppy get? Adult weight from age and weight.
Dog calorie calculatorCalories per day and cups or grams of food.
Dog years to human yearsAKC size chart plus the epigenetic clock.
Dog age calculatorExact age from a birthday, life stage, human years.
Dog size calculatorSize class from a puppy, the parents or the breed.
Dog pregnancy calculatorDue date window and a pregnancy timeline.

Cat calculators

Cat food calculatorCalories per day, wet and dry split, cans and cups.
Cat years to human yearsInternational Cat Care chart, month by month.
Cat age calculatorExact age from a birthday and life stage.

Quick answers

  • How many calories does a dog need? About 70 × (weight in kg)0.75 × a life-stage factor. A 10 kg neutered adult needs about 551–630 kcal a day (AAHA 2021).
  • How old is my dog in human years? 1 year ≈ 15, 2 years ≈ 24; at 10 years about 56 (small), 60 (medium), 66 (large) or 79 (giant) on the AKC chart.
  • How old is my cat in human years? 1 year ≈ 15, 2 years ≈ 24, then about 4 per year: 56 at 10 (International Cat Care).
  • How long are dogs pregnant? 58–72 days from the first mating, or 62–64 days from ovulation (Merck Veterinary Manual).

See sources and methodology for every formula and citation.