Easily determine the true cost of borrowing or the potential return on investments with our Interest Rate Calculator.
Compute annual interest rate (APR) from Loan Amount, Monthly Payment, and Term.
No Signup Required.
The calculator solves the monthly interest rate r from the amortization formula:
PMT = P * r / (1 - (1 + r)-n) using a stable bisection search. It then reports the nominal and effective APRs.
If your monthly payment is less than Loan Amount / Number of Payments, no positive interest rate can amortize the loan.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.