Inventory
Sell-through rate calculator.
Pick the definition you use, enter your unit counts, and see the rate, how long the remaining stock will take to clear, and how many more units you need to sell to reach a target.
Your inventory
Result
Method and limitations
Formulas: the rate is units sold divided by the denominator for the definition you choose: beginning inventory, sold plus ending inventory, or the average of beginning and ending inventory. Projected days to clear is ending inventory ÷ (units sold ÷ days in period). Units needed for a target is denominator × target %, rounded up, minus units already sold, holding the denominator fixed.
Different retailers and systems use different conventions, so compare like with like. As one published example, Shopify's inventory reports documentation defines its sell-through rate as quantity sold divided by (quantity sold plus quantity still in inventory). This page does not claim that any platform uses the other two definitions.
The days-to-clear figure assumes the sales pace in your period continues, which real demand rarely does. Everything is calculated in your browser from the numbers you type; nothing is sent anywhere.