How old is your dog in human years? Multiplying your dog's age by seven is easy, but isn't very accurate. This more carefully graded system piles the equivalent human years onto a dog's life more quickly during the dog's rapid growth to maturity. One "dog year" equals 4 "human years" from age 2-14 and 2 1/2 "human years" thereafter. See chart above to find out your dogs age!