Hi,
I am expert WordPress(Plugin / theme) developer. I can create a calculator to integrate on Wordpress. I am highly interested to work on this project.
If you want a shortcode to use anywhere of the wp page , I can provide shortcode too.
I can assure you to complete the job in time with quality according to your requested requirements.
Kindly message me so we can discuss in detail over chat.
Looking forward for your positive response.
Best Regards,
Hasan