Is there a product size, total cost calculator extension available?

I have searched but not found anything yet, so thought whilst I continue my research no harm in asking.

I'm looking for a solution within opencart hopefully via an extension that you may know is available.

I'm looking for a solution as I need a single product to be calculated by size;

For example the customer enters the Width (cm) and Height (cm) which has a pre-defined price per cm, and whatever size they enter it calculates the total price for them to add to the cart.

Do you know of an extension or a solution within openacart to achieve this?

Thanks in advance,

James

Something like this?

https://www.opencart.com/index.php?rout ... n_id=31938

Greats thanks, this looks like the solution im looking for, I will give it a try.