What is 9% of 20? 1.8 9% of 20 Copy 9% of 20 = 1.8. Formula UsedResult = (9 ÷ 100) × 20 = 1.8 Frequently Asked Questions What is 9% of 20?1.8. (9 ÷ 100) × 20 = 1.8.How to calculate 9%?Multiply by 0.09 (or multiply by 9 then divide by 100).