Hi,

Try this method:

1. Enable Units of Measure from the Sale. Sales -> Configuration Settings -> Units of Measure, and save it. In Product form view. set your Purchase UoM and Unit of Measure.

2. Enable product reference price from the Website. Website -> Configuration Settings -> Product Reference Price, and save it

3. Provide the 'Base Unit Count' on the product page -> price per unit is calculated basis of the sale price.

On website, this will be shown

Hope it helps