Multiply the number of steps you've climbed by 17, which is the average height in inches of a standard step. For example, if you climbed 100 stairs you would multiply 100 by 17, which comes out to 1,700 inches. Divide the number of inches you've just calculated by 63,360, which is the number of inches in one mile. So, if you climbed 1,700 inches, that would mean you've climbed .027 miles. Walk up 3,720 average-rise steps to equal climbing a mile.