Pet Age Calculator

How old is my pet in human years?


Our Pet Age Calculator will tell you.
Turns out it is not simple as just multiplying the cat and dog age by 7! Pets can age differently depending on their species, breed, and size.

Input your pet’s calendar age below and find out their relative age and life stage, anywhere from a fresh-faced Puppy or Kitten to a “golden oldie” Geriatric.

Pet Age Calculator

Pets age much faster than humans do

In humans, health checks mark senior life as age-related screening for disease becomes regular and recommended to start between 56 and 60, while this stage is considered earlier at age 40, usually, across many years, years of care.

In dogs and Cats, middle age arrives approximately at 7 years for small and medium sized pets, which surprises many owners using a pet age calculator for the first time.

For large and giant-breed pets, aging looks different, as they are regarded as aged when they reach 5 years, making daily care and health tracking more important.

From my experience helping families compare pet and people timelines, understanding how pets age faster than humans helps owners plan smarter checkups and lifelong care routines.

Cat/Dog age chart

See the differences between cat years and human years with our cat age chart below.

Cat/Dog AgeSmall Dog Age into human ageMedium Dog Age into human ageLarge Dog Age into human ageGiant Dog Age into human ageCat age into human age
1 year 15 15 15 1215 years
2 years 24 24 24 2224 years
3 years 28 28 28 3128 years
4 years 32 32 32 3832 years
5 years 36 36 36 4536 years
6 years 40 42 45 4940 years
7 years 44 47 50 5644 years
8 years 48 51 55 6448 years
9 years 52 56 61 7152 years
10 years 56 60 66 7956 years
11 years 60 65 72 8660 years
12 years 64 69 77 9364 years
13 years 68 74 82 10068 years
14 years 72 78 88 10772 years
15 years 76 83 93 11476 years
16 years 80 87 99 12180 years
17 years84 years
18+ years88 years