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 Type

Dog Size

Pet Age (years)

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 Age	Small Dog Age into human age	Medium Dog Age into human age	Large Dog Age into human age	Giant Dog Age into human age	Cat age into human age
1 year	15	15	15	12	15 years
2 years	24	24	24	22	24 years
3 years	28	28	28	31	28 years
4 years	32	32	32	38	32 years
5 years	36	36	36	45	36 years
6 years	40	42	45	49	40 years
7 years	44	47	50	56	44 years
8 years	48	51	55	64	48 years
9 years	52	56	61	71	52 years
10 years	56	60	66	79	56 years
11 years	60	65	72	86	60 years
12 years	64	69	77	93	64 years
13 years	68	74	82	100	68 years
14 years	72	78	88	107	72 years
15 years	76	83	93	114	76 years
16 years	80	87	99	121	80 years
17 years					84 years
18+ years					88 years