Question 1

How do you calculate a dog's age in human years?

Accepted Answer

This calculator uses the American Kennel Club (AKC) size-based chart. A dog's first year is about 15 human years for most breeds, but the pace changes with size: after the early years, small dogs age most slowly and giant breeds most quickly. For example, a 10-year-old small dog is about 56 in human years, while a 10-year-old giant breed is about 79.

Question 2

Is one dog year really seven human years?

Accepted Answer

No. The 'multiply by 7' rule is a myth. Dogs mature quickly in their first two years and then age at a rate that depends on their size, which is why the AKC chart uses a different curve for small, medium, large, and giant breeds.

Question 3

Do bigger dogs age faster?

Accepted Answer

Yes. Interestingly, giant breeds count as slightly younger than small dogs in their very first year, but they then age much faster — by age 13 a giant breed is about 100 in human years, versus about 68 for a small dog.

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

Dog Age Calculator

Dog years to human years chart (by size)

How the dog age formula works

Which size is my dog?