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# How is aging sotck calculated in the app

**Aging Stock** refers to inventory items that have been held in storage for an extended period without being sold. The term "aging" highlights the fact that these items have been in stock for longer than expected or desired, and as they age, they can become more challenging to sell.

## Terms and formula

* **SKU**: Stock Keeping Unit, a unique identifier for your product variants.

* **Product published date**: when the product has been published on Shopify.

* **Units sold**: how many units sold of products in a certain period.

* **Stock on hand**: the current stock levels of each product.

* **Last received date**: the last time received inventory from suppliers.

* **Last received units**: how many arrived units at the last time received inventory from suppliers.

* **Aged days**: how many days since the last received date.

```
[To Day] - [Last Received Date]
```