Free pet calculators

Pet Tools and Calculators

Eleven free tools for dog and cat owners: age, weight, calories, food, pregnancy, chocolate toxicity and symptoms. Each one shows its formula and names its sources.

  • Built on AAHA guidelines, the Merck Veterinary Manual and VCA criteria
  • Results as ranges, with the method explained
  • No sign-up, nothing sent to us
11Free tools
3Veterinary sources most tools rely on
0Sign-ups
Oct 2026Last reviewed

All tools

Choose a tool

DogDog Age CalculatorDog years to human years by size, with the AAHA chart, the UCSD Labrador formula and the AVMA rule side by side.Dog and catFood CalculatorCups and grams per day from your food label, with wet and dry mixes and bag duration.DogPuppy Weight CalculatorPredict adult weight and see the expected weight at each age on the way.Any petPet Name GeneratorNames for dogs, cats, birds, rabbits, small pets and reptiles.DogChocolate Toxicity CalculatorCheck your dog's chocolate dose in mg/kg against Merck's thresholds.Dog and catCalorie CalculatorDaily calories by life stage, neutering and body condition, using the AAHA formula.DogDog Pregnancy CalculatorDue date window from mating, LH surge or diestrus, with a calendar download.Dog and catSymptom CheckerFind out whether it is an emergency, a same-day visit or something to watch.Any petPet Age CalculatorConvert dog, cat and small-pet years to human years.Dog and catPet Weight TrackerLog weigh-ins for several pets, see the trend and check body condition.CatCat Age Chart and CalculatorCat years in human years, with the International Cat Care scale.

Method

How we build our calculators

Each tool starts from a published veterinary source, not from a rule of thumb copied between websites. Where sources disagree we show a range. Where no accepted method exists, for example human-year equivalents for hamsters, we say so and label our estimate as an estimate. The formulas are written out on every page so you can check them.

Examples: calories use the AAHA 2021 energy requirement table; chocolate toxicity uses the Merck Veterinary Manual thresholds of 20, 40 to 50 and 60 mg/kg; due dates use the Merck gestation ranges; the symptom checker follows VCA emergency and urgent-care criteria.

Questions

Frequently asked questions

Are these tools free?
Yes. There is no sign-up and no payment.
Where do the numbers come from?
Every calculator names its sources on its page: AAHA guidelines for calories and life stages, the Merck Veterinary Manual for chocolate toxicity and gestation, VCA Animal Hospitals for emergency criteria, and published studies where they exist.
Can the tools replace a vet?
No. They give general information and estimates. Call your vet or an emergency clinic when your pet is unwell.
Is my data stored?
The weight tracker and name generator save to your own browser only. We do not receive it.

Read next

Guides to go with the tools

GuidePet weight management guideSafe weight loss for dogs and cats.GuidePuppy growth chartWhat a healthy puppy weighs.GuideCat feeding guide by agePortions by life stage.
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