Adding 2 fields to calculate price

Hi there,
Is there any way in Zen cart of addins 2 fields to the cart (where a customer can input height & width of product) for zencart to calculate the cost based on dimensions?
We manufacture Fridge seals to order and would like to get this up and running.
Any more info needed let me know.
Cheers
Kerry

There's nothing built in. You'd need to write the logic to do this.

Cheers, any idea where I can get help with this? I am not too good with coding but if someone can say "go to this line and paste in this" etc...
Thanks in advance.
Kerry