First save these there files to your computer. Then upload them to your SharePoint.   I uploaded the Item_calculator.html here: http://sp13/_catalogs/masterpage/Display Templates/Search/Item_Calculator.html And the style.css & script.js here: http://sp13/_catalogs/masterpage/Display Templates/calc/style.css http://sp13/_catalogs/masterpage/Display Templates/calc/script.js   IMPORTANT: Check the lines 14,34 and 35 in the Item_Calculator.html to make sure, that your uploaded files are really in that place. You don’t have to change anything in the style.css and script.js to get the calculator work.   After that you have to create a Query Rule. I did that like this: 1. Open SharePoint Central Administration and click on “Manage Service Application”. 2. Click on Search

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