What is 25% of 20? 5 25% of 20 Copy 25% of 20 = 5. Formula UsedResult = (25 ÷ 100) × 20 = 5 Frequently Asked Questions What is 25% of 20?5. (25 ÷ 100) × 20 = 5.How to calculate 25%?Multiply by 0.25 (or multiply by 25 then divide by 100).