Looking for a size calculation module

[Michael123]

Hello

I'm new, but looking for a calculation module like on this page.

http://nemprint.dk/produkter/bannere

Size calculation and number calculation.
How can I make / download such a module?

Hope you can help!

[jenkinhill]

Maybe http://extensions.virtuemart.net/products/custom-size-detail

[Michael123]

Thank you it's good to prices per square meter 
But how do you make unit price examples at the bottom?

Joomla version: Joomla! 2.5.20
VM 2.6.2 php 5.5

[attachment cleanup by admin]

[Michael123]

Does anyone know how to make such a calculation table?