How many years were there from 15 b.c to 87 a.d?

To calculate the number of years from 15 B.C. to 87 A.D., you add the years before Christ to the years after Christ. There are 15 years from 15 B.C. to 1 B.C., and then 87 years from 1 A.D. to 87 A.D. This totals 15 + 87 = 102 years.