Mortgage rates touch every part of the home-buying math: your monthly payment, how much house you can afford, and whether refinancing your current loan makes sense. Even a 0.5% rate change on a $400,000 loan moves the monthly principal & interest by roughly $130 — about $47,000 over 30 years.
The single most powerful lever most buyers control is the down payment. Crossing the 20% threshold removes PMI (typically 0.5–1.5% of the loan per year) and usually unlocks better pricing. Our mortgage calculator models PMI explicitly so you can see the exact crossover point for your budget.
Extra principal payments are the quiet superpower of homeownership. One extra payment per year on a 30-year loan typically removes 4–6 years and tens of thousands in interest. Use the extra-payment field in the mortgage calculator and compare scenarios to see your exact savings.
When considering a refinance, compute your break-even: closing costs divided by monthly savings. If you plan to stay in the home beyond the break-even month, refinancing usually wins.