Are you using Windows Calculator to perform quick calculations while creating spreadsheets in Excel? You can save time by adding the calculator to the Quick Access Toolbar in Excel so you don't have to exit the program to enter the calculator.
To do this, click the down arrow on the right side of the Quick Access Toolbar and select More Commands from the drop down menu.
On the Quick Access Toolbar screen in the Excel Options dialog box, select Commands Not on the Alternatives Ribbon from the Select Commands from drop-down list..
Scroll down the long listing and select Calculator. Click Add to add the calculator to the Quick Access Toolbar.
Click OK to accept the change and close the Excel Options dialog..
You will see a Calculator icon on the Quick Access Toolbar. When you move the mouse over the icon, a clue appears that says “Personalized”. Despite the label, clicking on the icon, Windows Calculator opens.
The same procedure also works to add Windows Calculator to Excel 2010.