6/12 as a Decimal 0.5 6/12 = 0.5 = 50% Copy 6/12 = 0.5 = 50%. Simplified: 1/2. Formula Used6 ÷ 12 = 0.5 Frequently Asked Questions What is 6/12 as a decimal?0.5.What is 6/12 as a percentage?50%.