---
name: kpi-definitions
description: What days of stock and sell-through mean, and when to reorder.
---
# KPI definitions

- Days of stock: copies on hand ÷ copies sold per day, over the last 7 days.
- Reorder when a title falls below 5 days of stock.
- Sell-through: copies sold ÷ copies received, over the same 7 days.