What is 9% of 30? 2.7 9% of 30 Copy 9% of 30 = 2.7. Formula UsedResult = (9 ÷ 100) × 30 = 2.7 Frequently Asked Questions What is 9% of 30?2.7. (9 ÷ 100) × 30 = 2.7.How to calculate 9%?Multiply by 0.09 (or multiply by 9 then divide by 100).