Use the Calculator app’s floating feature to access it right from your Home screen.
To enable Calculator floating app:
- Launch
from your Home screen or All Apps screen. - Tap
from the upper-right corner of the screen, then tap Settings. - Tap Floating calculator to activate the floating app feature.
When activated, the floating app 
appears anywhere on your screen. Tap this to quick-launch the Calculator app.
If you want to disable floating calculator, you can tap the floating calculator icon, hold and move it to the Remove area on the top of the screen.
