Dog Years to Human Years: Dog Years to Human Years: Dog Age Chart and Calculator| The Old Farmer's Almanac

Dog age chart, how old is my dog? Black and brown dog with collar

How Old is My Dog in Human Years?

March 28, 2025

Dog Years to Human Years Calculator

Dog's Age	Human Years
years	years

Enter your dog's age (from 1 to 16) to get the human years equivalent. The calculation is made for a "medium" dog (21 to 50 pounds) using the AKC recommendation.

How old is your dog in human years? We used to simply multiply a dog’s age by seven. However, this calculation isn’t so cut-and-dried. See our dog age calculator and chart to discover your dog’s age.

Do Dogs Age 7 Years to Our 1 Year?

The easy way to calculate a dog’s age is to take 1 dog year and multiply it by 7 years. This is based on the assumption that dogs live to about 10 and humans live to about 70, on average. For example, a dog that is 5 years old is 35 in “human years.”

Contrary to common belief, dogs do not age at a rate of 7 human years for each dog year. The number of human years piles onto a dog’s life more quickly during the dog’s rapid growth to maturity.

How to Calculate a Dog’s Age Properly

Statistics from pet insurance companies, breed club surveys, and veterinary hospitals have helped us learn more about how dogs age. According to the American Veterinary Medical Association:

The first year of a medium-sized dog’s life equals approximately 15 years of a human’s life.
The second year of a dog’s life equals about 9 years for a human.
After that, every human year equals approximately 4 or 5 years for a dog.

Dog Years to Human Years Chart

If we think like a dog, here’s how a dog’s age compares to a human’s age! Note that this is still not a perfect calculator. There are many variations based on a dog’s breed, its background, and its size. Note that this calculator is for a medium-sized breed of dog. Consult the chart below to see the differences between dogs of different sizes (small, medium, large, giant). It should give you a good sense of where your dog is in the development/aging process.

Small Dog: 20 pounds or less
Medium Dog: 21 to 50 pounds
Large Dog: 51 pounds to 100 pounds
Giant Dog: Over 100 pounds


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