What is 80% of 80? 64 80% of 80 Copy 80% of 80 = 64. Formula UsedResult = (80 ÷ 100) × 80 = 64 Frequently Asked Questions What is 80% of 80?64. (80 ÷ 100) × 80 = 64.How to calculate 80%?Multiply by 0.8 (or multiply by 80 then divide by 100).