What is a loan term calculator?

A loan term calculator works backwards from a known monthly payment, loan amount, and interest rate to find how many months (and years) it will take to fully repay the loan.

What formula is used to calculate the loan term?

The calculator uses the amortization formula solved for n: n = -log(1 - P·r / M) / log(1 + r), where P is the principal, r is the monthly interest rate, and M is the monthly payment.

What happens if my monthly payment is too low?

If your monthly payment is less than or equal to the monthly interest accrued (P × r), the loan can never be paid off and the calculator will display 'N/A — payment too low to cover interest'.

Why does the result show both years and months?

Loan terms are often expressed in full years, but the exact payoff date frequently falls partway through a year. Showing both years and the remaining months gives you a precise payoff timeline.

Can I use this to compare different payment amounts?

Yes. Enter the same loan amount and interest rate with different monthly payment values to see how increasing your payment shortens the term and reduces total interest paid.

Loan Term Calculator

Overview

Calculate the exact payoff duration for any loan given the principal, annual interest rate, and fixed monthly payment. See the full term in years and months along with total interest paid.

The Loan Term Calculator solves for the repayment period when you know the loan amount, the annual interest rate (APR), and the fixed monthly payment. It uses the standard amortization formula to compute the exact number of months and converts the result into years and months for easy reading. You also see the total amount paid and the total interest charged over the life of the loan.

How to use

Find your loan payoff term in three quick steps.

Enter the loan amount: Type in the principal — the amount you borrowed or plan to borrow.
Enter the annual interest rate: Input the APR quoted by your lender as a percentage (e.g. 6 for 6%).
Enter your monthly payment: Specify the fixed monthly payment amount and click Calculate to see the payoff term.

FAQs

What is a loan term calculator?: A loan term calculator works backwards from a known monthly payment, loan amount, and interest rate to find how many months (and years) it will take to fully repay the loan.
What formula is used to calculate the loan term?: The calculator uses the amortization formula solved for n: n = -log(1 - P·r / M) / log(1 + r), where P is the principal, r is the monthly interest rate, and M is the monthly payment.
What happens if my monthly payment is too low?: If your monthly payment is less than or equal to the monthly interest accrued (P × r), the loan can never be paid off and the calculator will display 'N/A — payment too low to cover interest'.
Why does the result show both years and months?: Loan terms are often expressed in full years, but the exact payoff date frequently falls partway through a year. Showing both years and the remaining months gives you a precise payoff timeline.
Can I use this to compare different payment amounts?: Yes. Enter the same loan amount and interest rate with different monthly payment values to see how increasing your payment shortens the term and reduces total interest paid.