14.5 20 = 72.5% (remember to put the % sign so. So enter the numerator and denominator value in given input box, then press calculate button, the system will automatically calculate the percent value. Actually it means 5 is what percent of 20, which can be calculated as, (5/20)*100 = 5 * 5 = 25. According to 'fraction to percentage' conversion formula if you want to know what percent of 20 is 11.5 you. Brief introduction a fraction consists of two numbers and the fraction bar: