Pet age in human years

How old your cat or dog is in human years, which life stage your pet is in and how often it should see the vet.

Cat

Cat’s age	In human years
1 month	1 year
6 months	10 years
1 year	15 years
2 years	24 years
3 years	28 years
4 years	32 years
5 years	36 years
7 years	44 years
10 years	56 years
12 years	64 years
15 years	76 years
18 years	88 years
20 years	96 years

Dog

Dog’s age	Small, up to 9 kg	Medium, 10–22 kg	Large, 23–40 kg	Giant, over 40 kg
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	45	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

The “one year equals seven” rule is wrong: cats and dogs grow up very fast in their first two years, then age more slowly – large dogs faster than small ones. Charts based on iCatCare and AAFP for cats and AVMA for dogs, life stages from AAFP/AAHA. The conversion is approximate.