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    Your code is running when the page first loads, not after the user enters something in the input field. Put the code in an event listener. Commented May 24, 2019 at 19:56
  • Currently, it is only being calculated on load. You need to add onsubmit to the form or onclick to the button Commented May 24, 2019 at 19:56
  • Possible duplicate of JS doesn't get value from input Commented May 24, 2019 at 20:07