How to write a calculator like in the example?

Question

WordPress

https://lesante.by/kalkulyator/ - is it possible to write such a calculator?

Well, or at least as close as possible ...
it is very necessary - please help.

in general, it needs to be inserted into WP, maybe you can

Answer 1

You can go two ways:
1) Order writing / Write it yourself
2) Duplicate the existing solution and modify
Here is the main dirty code of this whole act (do not forget to increase the workspace, adaptability hides some elements at low resolutions). Next, in the styles, look for all classes, delete the excess and do the same with the script code.

Answer 2

it’s written, which means
that this site is also on wp, which means you can also

Answer 3

Try to create a new project exclusively for this script
script
- html
- css
- js
First, write a simpler script, and then add functionality. You do not need to immediately make an exact copy.
There are many instructions on the internet. Google:
how to make a calculator on the site
create a calculator js
make a calculator on html css