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Guides

Short, number-driven guides to the decisions behind the calculator.

How Much House Can You Afford? The 28/36 Rule, Explained

Use the 28/36 rule to work backward from your income to a realistic home price — with worked examples and the hidden costs most first-time buyers miss.

PMI Explained: What It Costs and 4 Ways to Avoid It

Private mortgage insurance costs 0.3–1.5% of your loan per year. Here is exactly when you pay it, what it costs at each down payment level, and how to remove it.

15-Year vs. 30-Year Mortgage: The Real Cost Difference

Same house, same rate environment — radically different lifetime cost. A side-by-side comparison of 15 and 30-year mortgages with exact numbers.

48 vs. 60 vs. 72 Months: How Car Loan Terms Change What You Really Pay

Longer car loans mean smaller payments and much bigger totals — plus negative-equity risk. Exact numbers for a typical $27,000 loan at each term.

When Does Refinancing Actually Make Sense? The Break-Even Math

The old "1% rule" is a shortcut, not an answer. Here is the break-even calculation that tells you exactly when a refinance pays off.

How Much Should You Really Put Down on a House?

20% down is a guideline, not a law. What each down payment level costs per month, what PMI really adds, and when a smaller down payment wins.