Use Merge Field in a Formula
You can perform calculations and logical comparisons in a table using standard Word formulas:
Open the Word document with the text of your Loan Agreement.
Place the cursor to where the value should be calculated in the text of your document template.
Go to the Insert → Quick Parts drop-down and Select Field.
In the Field dialog box, select Formula.
Enter formula. You can use table cells or numbers can be used for calculation. Names of table cells are formed as in Excel (e.g. A1, where A is line, 1 is column). You can refer to a bookmarked cell by using its bookmark name in a formula.
Click OK.
Example
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To calculate Service Costs as 15% of the Loan amount you need to multiply Loan amount (cell B1) on 15%.Â
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