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  • They should add a calculator to opera, looking for the windows or google calculator is a bummer, the opera sidebar is perfect to have an elegant and easy-to-use calculator

  • One workaround is to try this sidebar calculator extension

    Another workaround is to add any page you want that has a calculator to the sidebar. Goto the URL opera://flags/#sidebar-site-panel, enable the flag, restart Opera, click the 3 horizontal dots at the bottom of the sidebar, scroll down to "Custom site panels" and add the URL to the page. You could add to the sidebar for example to always get the Google calculator.