What is 8% of 90? 7.2 8% of 90 Copy 8% of 90 = 7.2. Formula UsedResult = (8 ÷ 100) × 90 = 7.2 Frequently Asked Questions What is 8% of 90?7.2. (8 ÷ 100) × 90 = 7.2.How to calculate 8%?Multiply by 0.08 (or multiply by 8 then divide by 100).