Calculate the final price after a percentage discount, or reverse the math to find the discount rate.
Mode 1: enter the original price and the discount percentage (e.g. 20 means 20% off, the same as a Chinese "8 折"). You get the final price and how much you save. Mode 2: enter the original price and the price you actually paid to work out the discount rate. Example: a $100 item at 20% off costs $80 and saves you $20. Results update live as you type.