You might open the calculator from the Windows OS and try making the calculation, but how about having the calculator inside the Excel? Yes , you can have the Calculator on the Quick Access toolbar, so that it is made available in Excel.
To Add the Calculator to the Excel 2007 Quick Access toolbar , follow the below steps
1. Click the more commands button , as described in the screenshot below .
2. Change the “Choose Commands From” combobox to All Commands and select the Calculator and Click the Add Button and click ok .
3. Now , you should see the Calculator in the Quick Access toolbar of Excel 2007 .