Days of Inventory (DSI) Calculator

Translate your stock into how many days it will last.

Days sales of inventory (DSI) turns your inventory into time -- how many days of cover you're holding at the current sales rate. Enter average inventory, COGS, and the number of days in the period.

Average inventory value ($) Cost of goods sold ($) Days in period

Results update when you click Calculate or change a value.

Days of inventory —

Equivalent turnover —

Days of inventory = (average inventory / cost of goods sold) x days in period

How it works

'We're holding 47 days of cover' is far more actionable than a raw unit count when you're managing cash and reorder timing. DSI is just the inverse of turnover, expressed in days, and the two are reported side by side here.

Reading DSI per SKU exposes what's about to run short and what's drowning in months of stock. Skuwell shows days of cover against live velocity so you can act before either becomes a problem.

Learn the terms

In the platform

Next step

Skuwell does this math for every SKU, automatically.

Reorder points, safety stock, turnover, and GMROI — computed live and turned into purchase orders. See it on a 30-minute walkthrough.

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