計算機
Dog / Cat Age Calculator
Convert your dog or cat's age to human years based on species, size, and AVMA guidelines
Based on AVMA & AAHA guidelines. The first year of a pet's life equals ~15 human years, the second ~+9, and each year after varies by species and size. Larger dogs age faster than smaller ones.
Age Comparison Table
| Pet Age | Dog (S) | Dog (M) | Dog (L) | Dog (G) | Cat |
|---|---|---|---|---|---|
| 1 yr | 15 | 15 | 15 | 15 | 15 |
| 2 yr | 24 | 24 | 24 | 24 | 24 |
| 3 yr | 28 | 29 | 30 | 31 | 28 |
| 4 yr | 32 | 34 | 36 | 38 | 32 |
| 5 yr | 36 | 39 | 42 | 45 | 36 |
| 6 yr | 40 | 44 | 48 | 52 | 40 |
| 7 yr | 44 | 49 | 54 | 59 | 44 |
| 8 yr | 48 | 54 | 60 | 66 | 48 |
| 9 yr | 52 | 59 | 66 | 73 | 52 |
| 10 yr | 56 | 64 | 72 | 80 | 56 |
| 12 yr | 64 | 74 | 84 | 94 | 64 |
| 15 yr | 76 | 89 | 102 | 115 | 76 |
| 18 yr | 88 | 104 | 120 | 136 | 88 |
| 20 yr | 96 | 114 | 132 | 150 | 96 |
Human-Equivalent Age
29
Human Years
3
Pet Years
0
Pet Months
⭐
Life Stage
Adult
Speciesdog
Sizemedium
Pet Age3 yr
Equivalent29 human years
Did you know? The common "1 dog year = 7 human years" rule is oversimplified. Dogs mature rapidly in their first two years, then slow down — and larger breeds age faster than smaller ones.