What is 50% of 20? 10 50% of 20 Copy 50% of 20 = 10. Formula UsedResult = (50 ÷ 100) × 20 = 10 Frequently Asked Questions What is 50% of 20?10. (50 ÷ 100) × 20 = 10.How to calculate 50%?Multiply by 0.5 (or multiply by 50 then divide by 100).