What is 80% of 30? 24 80% of 30 Copy 80% of 30 = 24. Formula UsedResult = (80 ÷ 100) × 30 = 24 Frequently Asked Questions What is 80% of 30?24. (80 ÷ 100) × 30 = 24.How to calculate 80%?Multiply by 0.8 (or multiply by 80 then divide by 100).