# Calculate a payment amount

Enter the loan principal and annual interest rate (for a fixed-rate loan), and select a
loan duration range from the drop-down box. After you click on “Calculate”, a results table
will be displayed showing the payment amount for each duration within the range.

## Guide to using this form

• By default, the calculation is performed for monthly payments and a simple interest
rate. To change these settings, select the “Advanced entry” box. *Note that this feature
requires that JavaScript be enabled in your brower.*

• After you click on “Calculate”, a variation table will appear below the results table
that contains small +/– changes in the interest rate and principal. Click on any of the numbers
in the variation table to recalculate the results table at the new value.