What is 20% of 75? 15 20% of 75 Copy 20% of 75 = 15. Formula UsedResult = (20 ÷ 100) × 75 = 15 Frequently Asked Questions What is 20% of 75?15. (20 ÷ 100) × 75 = 15.How to calculate 20%?Multiply by 0.2 (or multiply by 20 then divide by 100).