Everyday Math

Math, Numbers, and the Body

What is a dog’s and cat’s age equivalent compared to a human?

All animals “age” at different rates, and our domestic dogs and cats are no exception. Unlike humans, these pets seem to age more rapidly in terms of human years, with both animals being of an age equivalent to about 15 human years by the time they are one year old. There are, however, some differences for dogs. Some people have determined an age range depending on the size of the animal. For example, a dog over 90 pounds may only be equivalent to 12 human years by the time it is one year old; a dog 51 to 90 pounds is about 14 human years old when it is one year old; and dogs under 50 pounds are the equivalent of 15 human years by their first year. These age differences are reflected for the entire life of the dog. Below is a simplified table illustrating dog and cat years and their human age equivalents.

Human Age
Equivalent
Cat Age Dog Age
10 years   5 months
13 years   8 months
14 years   10 months
15 years 1 year 1 year
24 years 2 years 2 years
28 years   3 years
32 years 3 years 4 years
36 years 5 years 5 years
40 years 6 years 6 years
44 years 7 years 7 years
48 years 8 years 8 years
52 years 9 years 9 years
56 years 10 years 10 years
60 years 11 years 11 years
64 years 12 years 12 years
68 years 13 years 13 years
72 years 14 years 14 years
76 years 15 years 15 years
80 years 16 years 16 years
84 years 17 years 17 years
88 years 18 years 18 years
89 years   19 years
92 years 19 years  
93 years   20 years
96 years 20 years 21 years
99 years   22 years
103 years 23 years  
106 years 24 years  


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