On any page where a calculator can be useful to your site visitor, perhaps a buyer oriented page where they may want to check their payment amount for a home of interest, you can place this container on your page.
These all present the same choices, but with different display color schemes. Choose the container you want and drag & drop it onto your page.
Clicking on one will install it on the page, and now your visitors can choose a calculator for the information they want. Clicking on one of the choices will display the appropriate calculator.