When I click on the 'Calculate' button, nothing happens - what's the problem?

The problem may be that your web browser has not loaded the calculator web page properly, or that you are using an incompatible web browser, or that your web browser has stopped responding to user input (e.g. mouse click) events. 

Please ensure that you are using a standard popular JavaScript-enabled web browser (e.g. Chrome, Edge, Safari, Firefox) and that your web browser is updated to the most recent version. 

You can try re-loading or refreshing the calculator page:

  • For Windows computers, use the Ctrl-R keyboard combination;
  • for MacOS computers, use the Command-R keyboard combination;
  • and for iOS mobile devices, a downward swipe on any webpage‌ is all it takes to refresh a webpage in Safari. 
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