57/64 as a Decimal 0.890625 57/64 = 0.890625 = 89.0625% Copy 57/64 = 0.890625 = 89.0625%. Formula Used57 ÷ 64 = 0.890625 Frequently Asked Questions What is 57/64 as a decimal?0.890625.What is 57/64 as a percentage?89.0625%.