What this calculates
Principal and interest, plus realistic estimates for Florida property tax and homeowners insurance — the four components of PITI (the lender-required full monthly payment). Total interest over the loan life, and how down payment percentage shifts the math.
Default Florida assumptions: 1.0% effective property tax rate, 0.65% of dwelling value annual insurance (low for coastal Florida — adjust higher if you're near the water). Override either if you have actual quotes.