Anyway to remove calculate button

Right now there is no such function in the plugin. But you can achieve this goal in another way: use HTML code instead of WP plugin + hide the button with custom CSS.

1. Generate HTML-code here: https://www.drivebestway.com/widget/v1/html
2. Replace default CSS with your own: https://www.drivebestway.com/widget/v1/doc#design
3. Hide unwanted button with CSS.