What is 20% of 30? 6 20% of 30 Copy 20% of 30 = 6. Formula UsedResult = (20 ÷ 100) × 30 = 6 Frequently Asked Questions What is 20% of 30?6. (20 ÷ 100) × 30 = 6.How to calculate 20%?Multiply by 0.2 (or multiply by 20 then divide by 100).