Updated · Published by Radif Partners

Dog and cat calculators

Age, weight, food, poisoning risk, due date and budget, each from a named veterinary or kennel club source.

Sources checked

Nine calculators answer the questions owners type most often, from a dog's age in human years to whether the chocolate it just ate is dangerous. Each one uses a published veterinary source and shows it: the American Kennel Club chart by size and the 2020 DNA-methylation formula for dog age, International Cat Care and the AAHA/AAFP guidelines for cats, the Merck Veterinary Manual for daily calories and chocolate toxicity, a 2021 review in the journal Animals for whelping dates, and the ASPCA's cost-of-care table for budgets. Where a calculator needs breed data, it reads the adult weights and life spans recorded on our 200 breed pages, so a Labrador gets Labrador figures. Everything runs in your browser and nothing you type leaves your device. None of these tools replaces a veterinarian: they help you prepare a visit, plan a budget or judge urgency, and each page says where its numbers stop being reliable.

Dog age calculatorHuman years by size, the DNA formula, and the age your breed turns senior. Cat age calculatorCat years to human years, month by month for kittens, with the life stage. Puppy weight calculatorAdult weight range for 200 breeds by sex, or from the parents for a mix. Dog food calculatorCalories a day and cups of food for puppies and adult dogs. Cat food calculatorCalories a day and cans or cups for kittens and adult cats. Chocolate toxicity calculatorDose in mg/kg and whether it is an emergency. Dog pregnancy calculatorDue date and normal window from mating or progesterone timing. Cost of owning a dog or catYearly, first-year and lifetime budget for a dog or a cat. Vet costs calculatorExams, prevention, insurance, spay or neuter and dental, per month.

Quick check: your dog's age in human years

years

36
human years · full dog age calculator
  • Senior from 8 to 10 years for this size (AVMA)

Which calculator for which question

To picture your pet's stage of life, use the dog or cat age calculator; the dog version also tells you when your breed turns senior. To plan for a new puppy, the puppy weight calculator gives the adult range for its breed and sex, and the dog food calculator turns its weight into calories and cups. Cat owners have a separate food calculator, since cats need different energy factors.

For an emergency, the chocolate toxicity calculator tells you within seconds whether the dose calls for a vet. Breeders use the pregnancy calculator to place a due date and its window. The two cost calculators cover the yearly budget of owning a dog or cat and, in more detail, what to set aside for the vet.

How the calculators are checked

Every constant, from the 70 in the energy formula to the theobromine content of cocoa, sits in one parameter file with its source and the date it was read. The same code computes the result shown in the page and the one you get when you type, and automated tests compare its output with the published values: the AKC chart at each birthday, the International Cat Care table, the Merck formulas.

When a source is revised, the file changes once and every page that uses the figure follows. The methodology page lists the sources in full.

What these tools cannot tell you

Formulas describe averages. Two dogs of the same weight can need very different amounts of food, and a breed's weight range says nothing certain about a particular puppy. Toxic doses vary between individuals, and a due date is the middle of a window, not an appointment.

Use the results to ask better questions. If a figure surprises you, or your pet's health has changed, the answer comes from an examination, not from a calculator.

Not a substitute for a veterinarian

These calculators give averages and starting points. A veterinarian who examines your pet decides on treatment, diet and doses.

Formulas and sources in full: methodology · Breed data: all 200 breeds

By Radif Partners Updated

Frequently Asked Questions

Yes. There is no account, no form to submit and no limit. The calculations run in your web browser, so the age, weight or breed you type is never sent to a server or stored. You can bookmark a calculator and come back to it as your puppy grows or your budget changes.
From veterinary and kennel club sources named on each page: the Merck Veterinary Manual for energy needs and chocolate toxicity, the American Kennel Club and the AVMA for dog age and senior years, International Cat Care and the AAHA/AAFP guidelines for cats, and the ASPCA for costs. Each page links to them.
Only as background. Illness changes energy needs, drug doses and what a weight or age means, and none of the formulas here account for disease. Ask your veterinarian to set the plan for a sick, pregnant or elderly animal, and use the calculators to understand the figures they give you.
Start with the puppy weight calculator to see the adult range for its breed and sex, then use the dog food calculator with its weight today to get calories and cups. The cost of owning a dog calculator gives the first-year budget, including vaccines, microchip and spay or neuter.
Yes. The dog age calculator lets you choose a size column instead of a breed, the puppy weight calculator uses the parents' adult weights, and the food and chocolate calculators only need body weight. Mixed breeds simply lack the breed-specific senior age and weight range.
The sources are checked at least once a year and whenever one of them is revised: a new Merck chapter, an updated AKC chart or a new ASPCA cost table. The date of the last check is shown at the top of every calculator, and each source link carries the date it was read.