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The Lost to Stockouts report quantifies what running out of stock has cost you over the last 30 days, per SKU and location. Where the Out of Stock report shows what’s out right now, this report adds up the cumulative cost across the window - including items you’ve since restocked. Key columns: product, variant, SKU, location, days out of stock, units lost, and lost revenue. Units lost is the out-of-stock days multiplied by the SKU’s normal in-stock sell rate, and lost revenue is those units at the item’s price. Out-of-stock days don’t deflate the sell rate - Stockful uses the rate from when the item was in stock, so the estimate reflects real demand rather than the zero sales a stockout forces. Only items that turn customers away when out of stock are counted. If a variant continues selling on backorder when out of stock, it loses no sales and is excluded. When to use it: to size the cost of stockouts and prioritise which to prevent - the headline cumulative figure also appears on the dashboard.