www.wysiwygwebbuilder.com

Hi I want to add fix product price calculator, which is Product price x width x length. For example Product price £10.99, Carpet width 4m, length as required. 10.99 x 4m x 5m = £219.80

This would require a custom script using either javascript or jquery.

Did you try conditions?
https://www.wysiwygwebbuilder.com/conditions.html

If yes, do you have a demo project so I can see what you have done?

Thank you very much, I didn't try that before but it is helpful. Actually I create my website using online website builder then I purchased WYSIWYG web builder 19, this week and I am try once I figure out I will update. Thanks
at the moment I only can give this information, which is below
When customer select carpet and colour then, he can add the length as he needed

Price £10.99 Fixed
Width 4m in meters
Length blank box so customer can put any value

Calculate

Total

Add to basket

If you need help with this then please share a demo project so I can see how you have configured your form.

For further details about how to share a project file, please see this FAQ:
viewtopic.php?f=10&t=82134