What is 40% of 25? 10 40% of 25 Copy 40% of 25 = 10. Formula UsedResult = (40 ÷ 100) × 25 = 10 Frequently Asked Questions What is 40% of 25?10. (40 ÷ 100) × 25 = 10.How to calculate 40%?Multiply by 0.4 (or multiply by 40 then divide by 100).