What is 3% of 80? 2.4 3% of 80 Copy 3% of 80 = 2.4. Formula UsedResult = (3 ÷ 100) × 80 = 2.4 Frequently Asked Questions What is 3% of 80?2.4. (3 ÷ 100) × 80 = 2.4.How to calculate 3%?Multiply by 0.03 (or multiply by 3 then divide by 100).