4/100 as a Decimal 0.04 4/100 = 0.04 = 4% Copy 4/100 = 0.04 = 4%. Simplified: 1/25. Formula Used4 ÷ 100 = 0.04 Frequently Asked Questions What is 4/100 as a decimal?0.04.What is 4/100 as a percentage?4%.