Pet Age Calculator

The old “multiply by 7” myth

The classic rule of “one dog year equals seven human years” is a rough average that doesn't hold up. Pets mature very quickly in their first two years, then age more slowly — and for dogs, the pace depends heavily on breed size. Small dogs live longer and age gently; giant breeds age fast.

Dogs — breed-size-aware method

This calculator uses the widely-cited veterinary approach popularised by the American Veterinary Medical Association (AVMA) and American Kennel Club (AKC):

• Year 1 of a dog's life ≈ 15 human years
• Year 2 adds another ~9 human years (so a 2-year-old dog ≈ 24)
• Each year after that adds a fixed amount that depends on size:
  • Small (under 20 lb): +4 human years per year
  • Medium (20–50 lb): +5 human years per year
  • Large (50–100 lb): +6 human years per year
  • Giant (over 100 lb): +7 human years per year

For puppies under one year, the first-year growth is spread smoothly, so a 6-month-old puppy comes out around 7–8 human years.

Cats

Cats age on a single curve regardless of breed:

• Year 1 ≈ 15 human years
• Year 2 adds ~9 (a 2-year-old cat ≈ 24)
• Each year after that adds about +4 human years

Rabbits

Rabbits mature quickly: year 1 equals roughly 21 human years, year 2 adds about 12 more, then each subsequent year adds about 7 human years. Smaller breeds tend to live longer (10-12 years) than larger breeds (5-8 years).

Horses

The first year of a horse's life is about 6.5 human years, year 2 about 6.5 more, year 3 about 6.5 more, and year 4 about 3.5. After that, each year adds roughly 2.5 human years. A 20-year-old horse is around 63 in human years.

Hamsters

Hamsters have very short lifespans (2-3 years). They mature extremely fast: each hamster year is roughly 25 human years. A 1-year-old hamster is already middle-aged.

Parrots

Parrots vary enormously by species. Small parrots (budgies, cockatiels) live 10-20 years and age about 4-5 human years per year. Large parrots (macaws, cockatoos) can live 50-80+ years with each year roughly equivalent to 1-1.5 human years.

Turtles and tortoises

Turtles age very slowly. Aquatic turtles (lifespan 20-40 years) age about 2 human years per turtle year. Tortoises live 50-100+ years, and giant tortoises can exceed 150 years, with each year translating to about 0.5-1 human year.

Life stages

Beyond a single number, it helps to know your pet's life stage. Each stage has different nutrition, exercise, and veterinary-check needs, which the result summarises for you.

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