Pet Age Calculator

Convert your dog's or cat's age into human years and see their life stage and expected lifespan.

76 Species
74 Breeds
15 Languages
100% Free

About this calculator

Nulumia's Pet Age Calculator helps you convert your pet's age into human-equivalent years across 76 species โ€” dogs, cats, rabbits, parrots, reptiles, fish, horses, and more. Each species uses peer-reviewed formulas from authoritative bodies like AVMA, AAFP, ARAV, and AAEP. Beyond a single number, you'll see your pet's current life stage (puppy, junior, adult, senior, geriatric), expected lifespan, years remaining, and species-specific care insights. Browse 74 breed pages, 40 per-age guides, and 25 head-to-head comparisons โ€” all free, ad-light, and translated into 15 languages.

Dog Age Calculator & Lifespan Hub

Convert your dog's age to human years using the AVMA standard formula. Browse 54 breeds, 20 age guides, breed comparisons, and FAQs.

Cat Age Calculator & Lifespan Hub

Convert your cat's age to human years using AAFP feline life-stage guidelines. Browse 20 breeds, 20 age guides, breed comparisons, and FAQs.

Multi-Pet Age Comparison

Compare your dogs and cats together โ€” see who's the youngest, oldest, and how their life stages align.

Browse by pet group

10

Small Pets

Small mammals like rabbits, hamsters, and guinea pigs.

9 species

Birds

Parrots, canaries, finches and other companion birds.

10 species

Reptiles

Bearded dragons, geckos, snakes, and iguanas.

9 species

Turtles

Aquatic turtles and land tortoises.

12 species

Aquatic Pets

Goldfish, koi, betta and tropical fish.

9 species

Amphibians

Axolotls and dart frogs.

5 species

Farm Animals

Chickens, ducks, sheep, geese, turkeys, quail, horses, ponies, donkeys, mini pigs, pet goats, mini cows.

12 species

Exotic Pets

Capybaras, alpacas, and fennec foxes.

3 species

Cultural Pets

Elephants, water buffalo, camels and llamas โ€” pets in cultural context.

4 species

Invertebrates

Tarantulas, scorpions and hermit crabs.

3 species

How it works

  1. Choose your pet

    Pick from 76 species across 10 groups โ€” small mammals, birds, reptiles, turtles, aquatic pets, amphibians, farm animals, exotic working animals, cultural pets, and invertebrates.

  2. Enter age and details

    Type your pet's age in years and months. Some species ask for extra context โ€” size class for dogs, indoor or outdoor for cats and rabbits, sex for tarantulas, or UVB hours for reptiles.

  3. Get instant result

    See your pet's human-equivalent age, current life stage, expected lifespan range, and years remaining โ€” calculated server-side from validated formulas.

  4. Explore deeper

    Browse breed-specific pages, per-age guides, head-to-head breed comparisons, and 50+ FAQ entries on aging, life stages, and care.

Why pet age matters

Knowing your pet's true age in human-equivalent years helps you provide age-appropriate care:

  • Senior pets need different diets, joint support, and more frequent veterinary checkups.
  • Vaccination and parasite prevention schedules shift with each life stage.
  • Early detection of age-related conditions like dental disease, kidney decline, or arthritis becomes possible.
  • It helps you anticipate end-of-life care and quality-of-life conversations with your vet.

Methodology and sources

Our calculations follow peer-reviewed standards: AVMA size-adjusted formula for dogs, AAFP and AAHA feline life stage guidelines for cats, ARAV and ABVP-R references for reptiles, AAEP for horses, AAV and World Parrot Trust for birds, and species-specific bodies for the rest. Citations are linked on each calculator page. Formulas are reviewed and updated when authoritative bodies publish revisions.