MathIsimple
Pet Age Calculator

Pet Age Calculator

Convert your dog's or cat's age to human years with accurate breed-specific calculations. Discover your pet's life stage and get personalized care recommendations.

100% FreeBreed-SpecificPet Care Tips
Calculator
Enter your pet's information to calculate their human age equivalent

In years (decimals allowed)

Examples
Click on any example to automatically fill the calculator
🐱
3 year old cat
= 28 years
Adult
🐶
5 year old dog
medium breed
= 42 years
Adult
🐱
12 year old cat
= 64 years
Senior
🐶
10 year old dog
large breed
= 80 years
Geriatric
🐱
1 year old cat
= 15 years
Kitten
🐶
2 year old dog
small breed
= 24 years
Adolescent
How Do Pet Ages Compare to Human Ages?

The old "multiply by 7" rule is too simplistic. Modern veterinary science shows that pets age differently in different life phases:

For Both Dogs and Cats:

  • First year: Equivalent to 15 human years
  • Second year: Adds 9 human years (total 24)
  • Subsequent years: Vary by species and breed

After Age 2:

  • Cats: +4 human years per cat year
  • Small dogs: +5 human years per dog year
  • Medium dogs: +6 human years per dog year
  • Large dogs: +7 human years per dog year
Why Does Breed Size Matter for Dogs?

Larger dogs generally have shorter lifespans and age faster than smaller dogs. This affects how we calculate their human age equivalent:

Average Lifespans:

  • Small breeds (<25 lbs): 12-16 years
  • Medium breeds (25-60 lbs): 10-14 years
  • Large breeds (>60 lbs): 8-12 years
  • Giant breeds (>90 lbs): 6-10 years

Common Breeds by Size:

  • Small: Chihuahua, Pomeranian, Yorkshire Terrier
  • Medium: Beagle, Cocker Spaniel, Border Collie
  • Large: Golden Retriever, German Shepherd, Labrador
Understanding Pet Life Stages
Each life stage has specific care needs and health considerations

🐱 Cat Life Stages

🐱Kitten
0-1 year

Rapid growth and development phase

🐈Young Adult
1-2 years

Active and playful, reaching maturity

🐈‍⬛Adult
3-6 years

Prime years with stable health

🐱Mature
7-10 years

Middle-aged with potential health changes

😺Senior
11+ years

Elderly cat requiring special care

🐶 Dog Life Stages

🐶Puppy
0-1 year

Rapid growth and learning phase

🐕Adolescent
1-2 years

Teenage phase with energy and growth

🐕‍🦺Adult
2-7 years (varies by size)

Prime years with stable health

🐕‍🦺Senior
7+ years (varies by size)

Older dog needing extra care

🐶Geriatric
10+ years (varies by size)

Very elderly requiring intensive care

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