The 28/36 Rule ExplainedHow lenders size your payment against your income, with worked numbers15-Year vs 30-Year MortgagePayment, interest and flexibility compared on the same loanHow Mortgage Interest Is CalculatedThe amortization formula, month one worked by handIs Refinancing Worth It for 1%?Why the rule of thumb is really a break-even questionPay Off the Mortgage Early or Invest?A guaranteed return vs an expected one, and what to settle firstWhat Is a Mortgage Escrow Account?Why your payment changes on a fixed-rate loan
Each guide explains one idea, works an example with real arithmetic and links to the calculator that does the same math with your numbers. We are a calculator site, not a lender or adviser; where a rule comes from a regulator or the IRS, the guide links to the source.