calculate price by values writed with customer

Hello,

I have a big problem,

what I need is add module or change module, which calculate total price of product.

eg.

I have eshop with printing (baners, billboards, stickers ...) and I want to customer write dimensions of paper (width and height) and system automaticaly calculate total price of this product by price of 1m2. When customer will agree with price, buy by add to card and in card it will display total price of product - no price of 1m2.

Has anyone similar problem? knows anyone solution?

Thank

you could modify it in this way.

use product options, create the first option as 1m2 and give it a default value.

then change qty to x the amound of 1m2 that is needed.

so Qty 2 of 1m2 = 2m2.

But you will need to reword everything and make it look clearer to the customer.

there isnt a way in which a customer can input it manually, that would require a massive rewrite.