How high is 15 foot 5 in inches? 15 foot 5 = exactly 185 decimal inches. Step 1: Multiply the feet by 12. Step 2: Add the inches. Result: 15*12 + 5 = 185. How big is 5'5 in other units? cm: in: m: mm: 5feet5 and a quarter inch in cm: 165.735 cms: 5 foot 5 and a half inch in cm: 166.37 centimeters: 5ft5 and three quarters of an inch in cm: 167.005 centimeters: 5foot5 in meters: 1.65735 meters gquB4.