The official Google Calculator app is now available through the Play Store.

Originally shared by Andreas Proschofsky

The official Google Calculator app is now available through the Play Store. If I'm not missing anything this should be the last one of Google's pre-installed apps (on Nexus devices) to get that treatment. (If you don't count system services like the lock screen or settings)
https://play.google.com/store/apps/details?id=com.google.android.calculator