30-Year Mortgage Calculator: Estimate Payments, Interest & Amortization

Estimate your true mortgage cost in seconds. Enter loan details, tap “Calculate,” and the tool shows payment, total interest, and a 30-year amortization chart. Example: a $425 000 loan at 5.2 % has a $2 334 monthly payment and $415 240 interest over 30 years, before taxes or insurance. Average 30-year rates sat at 6.79 % in mid-2023 (Freddie Mac, 2023).