Here are the system requirements you need in order to use the Cost Calculator and avoid any technical issues. If you are not sure whether your server supports this, contact your host.
WordPress 4.6 or Greater It is recommended to use WordPress 5.5 or greater with Cost Calculator Builder Plugin
PHP 7.2 or Greater
MySQL 5.6 or Greater MySQL version 5.6 or greater OR MariaDB version 10.0 or greater (MySQL is preferred).
WP Memory Limit WP Memory limit of 128 MB or greater (256 MB or higher is preferred).