Hello @aissamadren
The form evaluates the equations properly. Please, look at the screenshot image:

But if you want the equations be evaluated as soon as possible, please, tick the “Eval the equations in the onchange and keyup events” option in the “Form Settings” tab (https://resources.developers4web.com/cff/images/documentation/form-settings-tab.png).
Best regards.
thank you. yes I know that the equations are calculated perfectly. but my problem is when the customer taps on the buy now button then he will go to the checkout page. the total price displayed is not the price which was calculated by the extension. but, it displays the price that I designated for a single meter.
https://zoeldeco.com/cart/
Hello @aissamadren
To use the calculated price from the WooCommerce cart and orders, you need the “CFF WooCommerce” add-on distributed with the Developer and Platinum versions of the “Calculated Fields Form” plugin and not the free one you have installed. You’ve installed the “WooCommerce Products And Variations Prices for Calculated Fields Form” plugin that allows you to use the product prices in the other direction, from the equations associated with the calculated fields.
Please, note we are not allowed to support any customers in these forums, and both the “WooCommerce Products And Variations Prices for Calculated Fields Form” plugin and the “CFF – WooCommerce” add-on are commercial.
For pro or commercial product support please contact us directly on our site. This includes any pre-sales topics as well.
Commercial products are not supported in these forums. We will happily answer this and any other questions you can have on our own site.
Thank you.