What is 80% of 50? 40 80% of 50 Copy 80% of 50 = 40. Formula UsedResult = (80 ÷ 100) × 50 = 40 Frequently Asked Questions What is 80% of 50?40. (80 ÷ 100) × 50 = 40.How to calculate 80%?Multiply by 0.8 (or multiply by 80 then divide by 100).