Multiply sign in custom fields

[Milbo]

Good plugin but still it not marking  what is needed to I have an carpet shop every product have  30 sizes 2x3,6x4....... means that I have30 customer fields and it suppose to calculate in each 30 custom field basic price*2*3 etc. For now any plugin vm is calculate just for one customer field and in custom fields work only + - but I need *

I think you can do that with the customsize. it can take the price of a variant dropdown. You can also create dropdown instead of free input values.

We can also adjust the plugin for you against a reasonable fee.

[rinopiponte]

You can always try Your Size Plugin for Virtuemart.

The plugin calculates the price of the product according to its surface, width * length * price_per_meter, besides it allows to set maximum and minimum measures and minimum price.

It's thought to use input fields as input for the user, but we could customize it for the usage of a dropdown with fixed prizes.
You can see a demo here
http://design-it.es/lienzo-detail

and the download link of the extension here
http://design-it.es/diseno-web-extensiones/your-size-custom-size-virtuemart-detail