54/64 as a Decimal 0.84375 54/64 = 0.84375 = 84.375% Copy 54/64 = 0.84375 = 84.375%. Simplified: 27/32. Formula Used54 ÷ 64 = 0.84375 Frequently Asked Questions What is 54/64 as a decimal?0.84375.What is 54/64 as a percentage?84.375%.