# Key Settings

**Days OF Order** — Days of past sales on which you are basing the prediction. This generates a daily velocity. Days with no stock availability are skipped in the **Days Of Order** count.

**Velocity** — Rate of sales per day when calculated by **Qty Sold in Days Of Order** divided by **Days of Order**.

**Deficit Supply** — Predicted deficit to your supply for multiple dates ranges calculated as ( **Velocity x Deficit Days) – (Available quantity + On Order)**.

**Days TO Order** — Days to which you are multiplying the daily velocity to generate an **Add to PO Qty**. While the deficit supply will be calculated for all dates, this selection enables a quick add to PO.