# Calculate a loan duration

Enter the loan principal, payment amount, and annual interest rate to calculate the corresponding
loan duration.

## 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.*

• The loan duration is calculated so as to acheive a whole multiple of the payment
period (monthly by default) using a payment amount as close as possible to the entered amount.
The payment period multiples used for this calculation are 1 month (for monthly and semi-monthly
payments), 3 months (for quarterly, weekly, and bi-weekly payments), 6 months (for semi-annualy
payments), or one year (for annualy payments). The maximum possible loan duration is 50 years.