What is 5% of 80? 4 5% of 80 Copy 5% of 80 = 4. Formula UsedResult = (5 ÷ 100) × 80 = 4 Frequently Asked Questions What is 5% of 80?4. (5 ÷ 100) × 80 = 4.How to calculate 5%?Multiply by 0.05 (or multiply by 5 then divide by 100).