# Do a Sensitivity / What-If Analysis in Excel

*This tutorial demonstrates how to do a sensitivity analysis in Excel.*

A sensitivity analysis involves entering a variety of financial scenarios to see which one is the most economically viable. In Excel, you can use single- or double-input data tables for your analysis.

## Single-Input Data Tables

For a single-input data table, you change one variable in a table to see the results, known as a **What-If Analysis**. For example, take a loan where the amount is **$2,000**, the interest rate is **6%**, and the payments are spread out over **12** months. The monthly payment amount is calculated in cell C8 using the PMT Function:

=PMT(C5/12, C6, -C4)

You can calculate hypothetical payment amounts – based on a **constant rate** and **variable terms** (**6**, **9**, **18**, and **24** months) – to see which scenario is best for you.

- To run a
**What-If Analysis**, highlight the partially blank data table –with rows for each hypothetical term (in months).

- In the
**Ribbon**, go to**Data > What-If Analysis > Data Table…**

- You want to fill the table in, replacing the original term with the “what-if” term and show corresponding payments. So, for the
**Column input cell**, set C6 (the original 12-month term).

- This changes the formula in cell C8 to pick up each value in Column B (i.e.,
*6*,*9*,*18*, and*24*) in place of the value**12**in C6. Click**OK**.

- The table is filled in with the new scenarios to show you how much the monthly payment would be should the term of the loan be adjusted.

## Double-Input Data Tables

A double-input data table lets you **adjust two variables**. So, as well as changing the term in months, you can change the interest rate applied to the loan. You can therefore have **both row and column input cells** instead of just one or the other.

Consider the worksheet below.

In this scenario, **both** the term and the interest rate are going to be variables. In the PMT formula held in C8, the value in C6 is replaced by the **row** values in Rows 9 to 12; and the value in C4 is replaced by the **column** values in Columns C to L.

- First, highlight the data table.
- Then in the
**Ribbon**, go to**Data > What-If Analysis > Data Table…**

- For the
**Row input cell**, select C5 (the**interest rate**), and in the**Column input cell**, select C6 (the**term**).

- Click
**OK**. Excel fills in the scenario table, as pictured below.