What is 4% of 30? 1.2 4% of 30 Copy 4% of 30 = 1.2. Formula UsedResult = (4 ÷ 100) × 30 = 1.2 Frequently Asked Questions What is 4% of 30?1.2. (4 ÷ 100) × 30 = 1.2.How to calculate 4%?Multiply by 0.04 (or multiply by 4 then divide by 100).