Sell-Through Rate & Reorder Calculator
Inventory health sits between two expensive mistakes - dead stock tying up cash, and stockouts killing momentum on a listing that was finally gaining traction. This calculator takes units received, units sold, and days elapsed since receiving stock, and returns your sell-through rate, current daily sell pace, and a straightforward projection of how many days of inventory remain at that pace. Set your own reorder threshold and it flags clearly when it’s time to place a new order.
Enter units received, units sold, and days elapsed to get your sell-through rate, daily sell rate, and days of inventory left before you stock out.
Frequently Asked Questions
How do you calculate sell-through rate?
Divide units sold by units received (or units in beginning inventory) over a given period, then multiply by 100. A sell-through rate of 60% over a month means 60% of received stock has sold in that time.
How is days of inventory left calculated?
Remaining units are divided by your average daily sell rate (units sold divided by days elapsed), giving a projection of how many more days of selling the current stock will cover at the same pace.
What’s a healthy sell-through rate?
It varies by category and reorder lead time, but many sellers target 40-80% sell-through per replenishment cycle - low enough to avoid stockouts, high enough to avoid tying up cash in slow-moving stock.
All tools are provided for estimation purposes only and do not constitute financial, legal, or compensation advice. Always confirm figures against your company's official comp plan and pricing policy.
sales math, done in the browser.