Any new Android device usually comes with the standard Calculator app, which is never available in the Playstore.
However, that is changing today.The Calculator is now available in the store as a standalone app.
This means that the Calculator app can be updated with more features on a faster basis instead of one having to wait for an Android firmware update.
The app is basically the same one that’s already on smartphones and tablets, the new 6.0 version does include support for Android Wear.
Download the standalone version of the Google Calculator here.