Paying half your mortgage every two weeks results in 26 half-payments — the equivalent of 13 monthly payments a year instead of 12. That one extra payment annually can shave years off the loan and save substantial interest. See the effect on the Amortization tab.
How this calculator works
Enter your numbers and the monthly payment recalculates instantly — no submit button, no page reload. The payment breakdown separates principal, interest, taxes, insurance, PMI and HOA. Use the tabs to view a full amortization schedule, compare scenarios side by side, or work backward from a monthly budget. Your inputs are encoded in the page link so you can bookmark or share a scenario without any account.