# Reorder: when to order and how many

> For each product: how many it sells a day, when it runs out, the last day to order, and how many to order, with Order now and Order soon.

Category: Stock and cost of goods · Web page: https://bookalyze.com/guides/reorder

## The list

**Where in Bookalyze:** Inventory → Reorder

| Status | Means |
| --- | --- |
| Order now | Stock and what's on order are at or below the reorder point |
| Order soon | The last day to order is within two weeks |
| Enough stock | Nothing to do yet |
| Not selling | No sales lately |

**Order N** opens a new purchase order with the product and quantity filled in.

## The maths

- **Sales a day:** half the last 7 days, 30% the last 30, 20% the last 90.
- **Safety stock:** covers ups and downs in sales over the lead time.
- **Reorder point:** sales a day × lead time, plus safety stock.
- **Order:** enough for the lead time and the days an order should last, less stock and what's on order, raised to the minimum order and rounded up to whole cartons.

## Settings

Lead time and days each order lasts for the company (45 and 60 to start), and per product its own lead time, minimum order and units in a carton.

## Not yet

- Leaving out days you were out of stock.
- Seasons.
- Stock per location (FBA against your warehouse).

## Related guides

- [Purchase orders and deliveries](https://bookalyze.com/guides/purchase-orders.md): Draft an order to your supplier, send it, and record each delivery as it arrives. Fill one in from an Alibaba.com receipt, and type the cost of one, the line total or the order total.
- [Products and SKUs: link every listing to what it holds](https://bookalyze.com/guides/products-and-skus.md): A product is the thing you buy and sell. Each marketplace SKU links to one, with how many units a listing holds, so a 2-pack or a bundle counts the right stock.
- [Home: what needs your attention](https://bookalyze.com/guides/home-needs-attention.md): One list of everything waiting on you, each line opening the page where it's done. When it's empty, you're caught up.