Free Online Calculators Loan Payment Calculator Loan Payment Calculator Home Enter values for the Loan Amount, Number of Months for Loan and the Interest Rate (e.g. 5.25) and click the Calculate button. Description Data Entry Loan Amount Loan Length in Months Interest Rate Monthly Payment Calculated Enter only numeric values (no commas), using decimal points where needed. Nonnumeric values will cause errors. The loan payment calculator should be used for comparison purposes only.