What is 30% of 50? 15 30% of 50 Copy 30% of 50 = 15. Formula UsedResult = (30 ÷ 100) × 50 = 15 Frequently Asked Questions What is 30% of 50?15. (30 ÷ 100) × 50 = 15.How to calculate 30%?Multiply by 0.3 (or multiply by 30 then divide by 100).