What is 40% of 80? 32 40% of 80 Copy 40% of 80 = 32. Formula UsedResult = (40 ÷ 100) × 80 = 32 Frequently Asked Questions What is 40% of 80?32. (40 ÷ 100) × 80 = 32.How to calculate 40%?Multiply by 0.4 (or multiply by 40 then divide by 100).