Average Price per gr, ml or KG on Listing Pages

Hello all,
I need to display an average price per milliliter. All products should appear in a list, one line per item. Example:
# Name Order# PackSize Price Price per ml
1 HIS-Buster Nickel Affinity Gel 001 25 ml 125,00 EUR 5,00 EUR # Add to Cart Button #
2 HIS-Buster Nickel Affinity Gel 002 50 ml 230,00 EUR 4,60 EUR # Add to Cart Button #


Any help appreciated, thanks a lot for your help.

Andreas