What is 10% of 30? 3 10% of 30 Copy 10% of 30 = 3. Formula UsedResult = (10 ÷ 100) × 30 = 3 Frequently Asked Questions What is 10% of 30?3. (10 ÷ 100) × 30 = 3.How to calculate 10%?Multiply by 0.1 (or multiply by 10 then divide by 100).