15/64 as a Decimal 0.234375 15/64 = 0.234375 = 23.4375% Copy 15/64 = 0.234375 = 23.4375%. Formula Used15 ÷ 64 = 0.234375 Frequently Asked Questions What is 15/64 as a decimal?0.234375.What is 15/64 as a percentage?23.4375%.