Definition
A stockout is when available inventory cannot meet demand. Soft stockouts include stranded FBA units or unallocated warehouse stock that never reached the channel.
Worked example
A SKU sells 25/day with 5 days left and a PO still 12 days out → stockout unless you expedite, transfer, or substitute.
Why it matters for replenishment
Stockouts lose ads efficiency, rank and customers. Measuring stockout days also corrupts average sales if you do not exclude them from forecasts.
How OmniRestock uses this
OmniRestock projects stockout dates per SKU and can alert via email, Slack or Teams before you run out.