MortMetrix Guides
Mortgage Guides: Learn the Math Behind Your Mortgage
Every guide answers a real mortgage question and shows the math behind the answer. Start with the fundamentals, understand the numbers, and see how the calculations apply to your own mortgage.
Mortgage Payoff
Everything you need to understand, plan and track paying your mortgage off ahead of schedule.
Mortgage Payoff vs. Investing
The break-even is your mortgage rate. Below it, pay down; above it, invest. The rest is risk and tax.
Read moreShould You Pay Off Your Mortgage Early?
A numbers-first framework for the decision — order of operations, the tax angle, and the honest trade-offs.
Read moreHow to Pay Off Your Mortgage Early
Seven ways to clear a mortgage ahead of schedule, each with the years and interest it saves.
Read moreExtra Mortgage Payments
What an extra $100, $200 or $1,000 a month actually does — quantified, with the amortization math behind it.
How Much Does One Extra Mortgage Payment Save?
One extra payment a year vs. one payment ever — two very different answers, both worked through.
Read moreWhat Happens If You Pay $200 Extra on Your Mortgage?
The full before-and-after on a $400,000 loan: payoff date, interest, equity — and how $100, $500 and $1,000 compare.
Read moreHow Extra Mortgage Payments Work
The mechanism: extra principal has no interest attached, so it compounds against every remaining month.
Read moreAmortization
How the split between interest and principal is calculated, and how to read your own schedule.
Mortgage Interest
How much interest a mortgage really costs over its life, and the three levers that change the total.
How Extra Payments Reduce Mortgage Interest
Interest is rate times balance. Shrink the balance once and you shrink every future charge.
Read moreHow Much Interest Will You Pay on Your Mortgage?
The lifetime interest number, how it's built, and the three levers — rate, term, extra principal — that move it.
Read moreMortgage Equity
What home equity is, how each payment builds it, and how extra principal speeds it up.
Loan Types & Getting Approved
PMI, FHA, VA, USDA, jumbo loans, down payments and affordability — the decisions that come before you have a mortgage at all.
How Much Should You Put Down on a House?
Every down payment option from 0% to 20%, side by side, with the monthly cost of each.
Read more20% Down Payment vs. PMI: Which Costs You Less?
Buying now with PMI versus waiting to save 20% — and why appreciation can move the target faster than you save.
Read moreWhat Is an Escrow Account and How Does It Work?
Why a "fixed" payment still changes each year, how shortages are recovered, and when you can skip escrow.
Read moreWhat Is PMI (Private Mortgage Insurance)?
What PMI costs by down payment size, how it's calculated, and the two ways it legally comes off your loan.
Read moreFixed-Rate vs. Adjustable-Rate Mortgage (ARM): What's the Difference?
What a 5/1 ARM saves up front, and what a single capped adjustment can cost you afterwards.
Read moreFHA vs. Conventional Loan: Which Is Right for You?
Five ways to finance the same home compared — and why your credit score, not the headline rate, usually decides which loan wins.
Read moreVA Loans Explained: Eligibility, Benefits, and How They Work
Zero down, no mortgage insurance ever, and a one-time funding fee — what a VA loan actually costs across five scenarios.
Read moreWhat Is a Jumbo Loan and When Do You Need One?
The 2026 conforming limits, what jumbo underwriting actually demands, and three ways to avoid needing one.
Read moreMortgage Pre-Approval vs. Pre-Qualification: What's the Difference?
What each one actually requires, how long it takes, and why only one of them gets an offer taken seriously.
Read moreWhat Is Debt-to-Income (DTI) Ratio?
Front-end vs. back-end DTI, what actually counts as debt, and the real limits by loan program.
Read moreUSDA Loans: Do You Qualify for 0% Down?
Zero down for moderate-income buyers in eligible areas — the income limits, the guarantee fee, and how it compares to VA and FHA.
Read moreMortgage Closing Costs Explained: What to Expect
A full line-item breakdown of $12,000 in closing costs, who pays what, and four ways to reduce the total.
Read moreHow Much House Can I Afford?
The 28/36 rule applied to a real budget — and why $500 of monthly debt costs $70,000 of buying power.
Read moreRefinancing & Rate Moves
Refinancing, recasting, cash-out and points — when a rate or balance move actually pays for itself.
How to Remove PMI From Your Mortgage
The 80% and 78% LTV triggers, how extra payments pull them forward, and how to submit the request.
Read moreWhat Are Mortgage Points and Are They Worth Buying?
What a point costs, what it buys, and the break-even that decides whether it was worth it.
Read moreWhen Should You Refinance Your Mortgage?
The break-even calculation, plus the reset-the-clock cost that can make a lower rate more expensive overall.
Read moreCash-Out Refinance vs. HELOC vs. Home Equity Loan
Three ways to borrow against equity, and why a low existing rate usually rules the cheapest-looking one out.
Read moreMortgage Recast vs. Refinance: What's the Difference?
Four ways to use a $50,000 lump sum — the lowest payment and the lowest total interest are not the same path.
Read moreRun your own numbers
Track your actual mortgage
The figures on this page are an example loan. MortMetrix builds your full amortization schedule from your real balance, rate and term, then shows exactly what any extra payment does to your payoff date, lifetime interest and equity.
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