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# Calculating the correct price when your supplier uses a different unit

If your **supplier uses a different unit** from the one you use in Robaws for this item, you can register this on the item suppliers of an [item file](/en/article/items-general-rkvihx/). 
By using the field 'quantity in package', you can **determine the cost price of the item on the basis of the purchase price at the supplier.**

![](https://storage.crisp.chat/users/helpdesk/website/-/e/a/d/f/eadf6dec760ec000/schermafbeelding-2026-03-20-om_j5jmha.png =1200x202)

**Quantity in package** is the number of pieces of the [stock unit](/en/article/working-with-unit-types-1gs3057/) that are contained in the [purchase unit](/en/article/working-with-unit-types-1gs3057/).

This feature has a **twofold function:**

1. Determining the correct price of the item: the supplier's purchase price is divided by the quantity in package to determine the cost price.
2. Booking the correct quantity for the purposes of stock management.

## Example 1

I order paint from the supplier Colora. The tins of paint are delivered per box, and there are 6 pieces in the box. 
The stock unit is 'piece', while the purchase unit is 'box'.

| Cost price of the supplier | Unit supplier | Unit Robaws | Quantity in package | Cost price per unit Robaws |
| ---- |
| 1 box = € 80.00 | box | piece | 6 | 1 piece = 80.00 €/6 = 13.33€ |

## Example 2

I order screws from the supplier Apok. I have to order these per pallet, and a pallet holds 50 boxes each containing 100 screws.
The stock unit in Robaws is 'piece', while the purchase unit at the supplier is 'pallet'.

| Cost price of the supplier | Unit supplier | Unit Robaws | Quantity in package | Cost price per unit Robaws |
| 1 pallet = € 500.00 | pallet | piece | 50 x 100 screws = 5000 | 1 piece = € 500.00/5000 = 0.10 |