9/12 as a Decimal 0.75 9/12 = 0.75 = 75% Copy 9/12 = 0.75 = 75%. Simplified: 3/4. Formula Used9 ÷ 12 = 0.75 Frequently Asked Questions What is 9/12 as a decimal?0.75.What is 9/12 as a percentage?75%.