What is 30% of 20? 6 30% of 20 Copy 30% of 20 = 6. Formula UsedResult = (30 ÷ 100) × 20 = 6 Frequently Asked Questions What is 30% of 20?6. (30 ÷ 100) × 20 = 6.How to calculate 30%?Multiply by 0.3 (or multiply by 30 then divide by 100).