Loan payment estimate Estimate a monthly payment from principal, annual rate, and years. Details Enter a principal, an annual rate, and a number of years to estimate the monthly payment. The figure uses the standard amortization formula. It is not a loan offer. Fees, taxes, and extra payments are not included. Category: Everyday Page: /tools/loan-calculator Text: /tools/loan-calculator.txt Limits This is the standard amortization formula. It is not a loan offer, and it ignores fees, taxes, and extra payments. Steps 1. Enter principal, rate, and years. 2. Read the payment, total, and interest. 3. Change the rate to compare. Questions What if the rate is 0? The payment is principal divided by the number of months. Are payments monthly? Yes. The year count is turned into months. Is this financial advice? No. It is an estimate.