Everyone may know that only Microsoft Excel which can be used for calculation number; however, Microsoft Word also be able to work on calculating with basic formula such as Sum, Average, Min, etc.
Go to Microsoft Word then create a table to put simple budget plan as below:
In Amount Column, please put your cursor then go to Layout Tab then select Formula
After that you will see the Formula dialogue box appear, please select the formula which you want to use (Ex: Total the budget which is used Sum) Then you will see the result as below:
You try with other formula as you wishes