> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stockful.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Lost to Stockouts

> What stockouts have cost you over the last 30 days

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](/user-guide/reports/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.