Which calculator do you need?
Before you buy: start with affordability (the 28/36 rule with taxes and insurance counted), sanity-check the decision with rent vs. buy, and plan the cash with the down payment calculator. Choosing a term? The 15 vs. 30 year comparison includes the invest-the-difference math most tools skip.
While you own: the amortization schedule shows where every payment actually goes; extra payments, biweekly schedules, and a recast are the three ways to attack the balance — the first two shorten the loan, the recast lowers the payment.
When rates move: refinance break-even tells you the month the closing costs pay for themselves (and warns when a term reset quietly costs more), and points break-even answers whether buying down the rate is worth it. Tapping equity? The HELOC payoff calculator keeps the exit visible.
Looking for the national picture instead? Our average mortgage payment page computes the payment on a median-priced U.S. home at the current Freddie Mac rate — sourced, dated, and citable.