What is 3% of 20? 0.6 3% of 20 Copy 3% of 20 = 0.6. Formula UsedResult = (3 ÷ 100) × 20 = 0.6 Frequently Asked Questions What is 3% of 20?0.6. (3 ÷ 100) × 20 = 0.6.How to calculate 3%?Multiply by 0.03 (or multiply by 3 then divide by 100).