What is 80% of 25? 20 80% of 25 Copy 80% of 25 = 20. Formula UsedResult = (80 ÷ 100) × 25 = 20 Frequently Asked Questions What is 80% of 25?20. (80 ÷ 100) × 25 = 20.How to calculate 80%?Multiply by 0.8 (or multiply by 80 then divide by 100).