|Let's say Cell A1 is your Input Value:|
Cell B1 will be your Total Value:
Type the following into Cell C1:
Now Format C1 as Percentage.
* Right-Click C1.
* Format Cells.
* On the "Numbers" tab, Click on "Percentage".
* Modify your "Decimal Places", if needed.
* Click on "OK".
Cell C1 should now show: