Sell-Through Rate is a measurement of how much inventory is sold in a period of time. It is typically measured over a month, quarter, or year.
A sell-through rate of 100% over a month means that the entire inventory is sold over 30 days. A sell-through rate of more than 100% means that more than the value of inventory is sold each month.
Sell-Through Rate = Units Sold / Inventory at the Begining of the Period x 100%