How Old Is My Dog in Human Years?

white dogAlthough many people believe that one human year is equivalent to 7 dog years, the conversion is actually more complex. Dogs age similarly to cats, with an accelerated first couple of years bringing them into young adulthood and then a gradual slowing until each human year equates to only around 4-6 dog years, depending on the size of the dog breed. Large dogs age faster than small dogs and cats on average.

The following is a conversion of human years to dog years for different dog sizes.

Human Years Compared to Dog Years

Age Human Years

Actual Age in Dog Years

Less Than 21 Pounds 21-50 Pounds 51+ Pounds

1

15 15 15

2

24 24 24

3

28 28 28

4

32 32 32

5

36 36 36

6

40 42 45

7

44 47 50

8

48 51 55

9

52 56 61

10

56 60 66

11

60 65 72

12

64 69 77

13

68 74 82

14

72 78 88

15

76 83 93

16

80 87 120

17

84 92

18

88 96

19

92 101

20

96 105

*Table adapted from WebMD, “How to Calculate Your Dog’s Age,” Reviewed by Audrey Cook, BVM&S on March 17, 2010; I have added the years beyond 16 for small and medium-sized breeds, based upon the prior yearly age intervals given in the original table

See How Long Do Dogs Live? for information about the typical canine lifespan and videos featuring the world’s oldest dogs. For a full list of dog articles, see the main Dogs page.

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