What is 8% of 80? 6.4 8% of 80 Copy 8% of 80 = 6.4. Formula UsedResult = (8 ÷ 100) × 80 = 6.4 Frequently Asked Questions What is 8% of 80?6.4. (8 ÷ 100) × 80 = 6.4.How to calculate 8%?Multiply by 0.08 (or multiply by 8 then divide by 100).