Tools

Dog Age Calculator

Dogs don't age seven years for every one of ours. Size and breed change the math.

Dog years to human years chart

Find your dog's age on the left, then read across to the column that matches your dog's adult weight.

Age in human years, by the dog's age and adult weight
Dog's age Small up to 20 lb Medium 21-50 lb Large 51-100 lb Giant over 100 lb
1 year 15 15 15 15
2 years 24 24 24 24
3 years 28 29 30 31
4 years 32 34 36 38
5 years 36 39 42 45
6 years 40 44 48 52
7 years 44 49 54 59
8 years 48 54 60 66
9 years 52 59 66 73
10 years 56 64 72 80
11 years 60 69 78 87
12 years 64 74 84 94
13 years 68 79 90 101
14 years 72 84 96 108
15 years 76 89 102 115
16 years 80 94 108 122

How this is calculated

The first year counts as about 15 human years and the second adds about 9, following guidance the American Kennel Club quotes from the American Veterinary Medical Association. After that each year adds about 4 human years for small dogs, 5 for medium, 6 for large and 7 for giant breeds. Typical lifespans come from a 2024 UK study of 584,734 dogs, and life stages follow the American Animal Hospital Association definitions.

Read the full guide