Days of Inventory Calculator
Estimate how many days of stock you have left at your current sales pace. Enter your units on hand, the units you sold in a period, and the length of that period.
How is days of inventory calculated?
Days of inventory estimates how long your current stock will last at your recent sales rate. The formula is:
Days of inventory = units on hand / (units sold / period days)
If you hold 300 units and sold 90 over the last 30 days, you are selling 3 per day, so you have about 100 days of inventory left. Low days of inventory flags products that may sell out soon. High days of inventory flags slow movers that may be worth promoting or clearing.
We explain how to merchandise on this signal in our post on the days of inventory attribute.
Stop calculating this by hand
Dynasort tracks days of inventory for every product automatically and can sort your collections by it, so fast movers and slow movers land in the right place without a spreadsheet. No theme changes, no page speed impact.