// read the fine print once, properly
Guides
Ten plain-language explainers behind the calculators — written to be read once and used forever. Every number in them is computed by the same engine as the tools.
How Amortization Works (With a Worked Example)
What amortization actually means, the formula behind every fixed loan, and a month-by-month worked example on a $300,000 mortgage.
Why You Pay Mostly Interest in the Early Years
It isn't a bank trick — it's arithmetic. Why early loan payments are dominated by interest, and what actually moves the crossover point.
Extra Payments vs Investing the Difference
The honest framing of a classic dilemma: paying down a loan is a guaranteed return, investing is a probabilistic one. The math of both sides, no advice.
The Biweekly Payment 'Trick', Explained Honestly
How biweekly mortgage payments actually save interest, where the savings really come from, and the fee traps to avoid.
How PMI Removal Works: The 80% / 78% Rules
Your three exits from private mortgage insurance under the Homeowners Protection Act — request at 80% LTV, automatic at 78%, and the appreciation shortcut.
Credit Card Minimum Payment Math
Why minimum payments stretch a balance across decades: the formula issuers use, a worked example, and the fixed-payment escape.
15 vs 30 Year Mortgage: The Full Tradeoff
The complete comparison — payment, total interest, rates, equity speed, flexibility, and the hybrid strategy — with engine-exact numbers.
How Lenders Calculate Your Payment (Formula Walkthrough)
The amortization payment formula derived step by step, computed by hand on a real example, and the rounding details lenders apply.
Refinance Break-Even, Explained
When a refinance actually starts paying you back, how to compute the break-even month properly, and the term-reset trap most calculators hide.
Loan Glossary: APR vs Rate, Principal, Escrow, Recast & More
Plain-language definitions of the terms that decide what your loan costs — interest rate vs APR, principal, escrow, points, PMI, recast, and the rest.