What is 2% of 20? 0.4 2% of 20 Copy 2% of 20 = 0.4. Formula UsedResult = (2 ÷ 100) × 20 = 0.4 Frequently Asked Questions What is 2% of 20?0.4. (2 ÷ 100) × 20 = 0.4.How to calculate 2%?Multiply by 0.02 (or multiply by 2 then divide by 100).