That’s of course, until Apple decides to change how widgets work again and will bring back former widget functionality. Unfortunately, there is not way that you can use the built-in Calculator app as a widget anymore. They aren’t interactive, not available to receive keyboard input anymore and have stopped working as mini-apps. The widgets are now only available to provide info at a glance.

However, similar to iOS 14, Apple has changed WidgetKit in macOS Big Sur. A swipe-left from the right-side of the MacBook trackpad, provided instant access to the built-in macOS Calculator.

The Calculator app available in the Notification Center was a useful feature for most Mac owners. Why Did Apple Removed The Calculator Widget? Is the Calculator widget not showing up in your Mac’s Notification Center ever since you updated to macOS Big Sur or macOS Ventura? Trying to add it from Edit Widgets section but it’s not showing up? Everyone is missing the Calculator widget, because unfortunately, Apple has discontinued it in macOS 11!

Mac dashboard widgets 2016