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Real Estate & Mortgage Calculators

Real estate calculators: mortgage payments, amortization schedules, and home affordability.

Buying a home is the largest borrowing decision most people ever make, and almost every question about it reduces to the same arithmetic: how much loan a payment supports, and how much that loan costs over time. These calculators cover the full arc of a mortgage — working out what you can afford before you shop, estimating the monthly payment once you have a price in mind, reading the amortization schedule that shows where the money actually goes, and then deciding whether to pay the loan down faster or refinance it. They share one engine, so the numbers stay consistent as you move between them.

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CentCompass
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Calculators

When to use each calculator

House Affordability Calculator
Start here before you view a single listing. It works backwards from your income, debts, and down payment to a realistic price ceiling, so you shop in the right bracket instead of falling for a house you cannot finance.
Mortgage Calculator
Use it once you have a specific price. It estimates the full monthly cost including property tax, insurance, and PMI — the difference between the loan payment and what actually leaves your account.
Amortization Calculator
Use it to see how each payment splits between interest and principal, and when that split finally tips in your favour. It explains why the balance barely moves in the early years.
Mortgage Payoff Calculator
Use it when you have spare cash flow and want to know what an extra payment is worth. On a long mortgage the interest saved is usually far larger than people expect.
Refinance Calculator
Use it when rates have moved or your credit has improved. It compares your current loan against a new one including closing costs, and finds the break-even point.

Choosing between them

Affordability or mortgage calculator?

They answer opposite questions. The affordability calculator takes your finances and returns a price; the mortgage calculator takes a price and returns a payment. Use affordability first to set your range, then the mortgage calculator to test specific listings inside it.

Payoff or refinance?

Both reduce what you pay the lender, but through different mechanisms. Paying extra shortens the loan without changing the rate and costs nothing to start. Refinancing lowers the rate but resets the schedule and charges closing costs. If rates have not moved much, extra payments are usually the cheaper route.

Mortgage or amortization calculator?

The mortgage calculator gives you the full housing payment including escrow items. The amortization calculator strips that away and focuses purely on the loan, row by row, which is what you want when you are trying to understand the interest curve rather than budget a monthly bill.

Guides

  • What Is PITI?Principal, Interest, Taxes and Insurance — the four parts of a mortgage payment, why lenders judge you on all four, and how escrow actually works.
  • What Is PMI?Private mortgage insurance protects the lender, not you. Here is what it costs, when it applies, and the three different ways to get rid of it.
  • Fixed vs Adjustable Rate MortgageHow ARMs actually adjust, what the caps really protect you from, and the specific circumstances in which each type of mortgage is the better choice.

Explore more

Browse every calculator on the site, read our financial guides, or see how CentCompass is built and reviewed.

Frequently asked questions

Which calculator should I use first?

Start with house affordability to establish a realistic price range from your income, existing debts, and down payment. Only then does a mortgage payment estimate on a specific home mean anything.

Why is my estimated payment higher than the loan payment I expected?

Because a mortgage payment usually includes property tax, homeowners insurance, and private mortgage insurance alongside principal and interest. Those escrow items can add several hundred dollars a month depending on where you buy.

Does paying extra lower my monthly payment?

No. Extra payments shorten the loan rather than reduce the bill. If you want a lower monthly payment on the same loan, ask your lender about recasting, which recalculates the payment after a lump sum.

How do I know if refinancing is worth it?

Compare the break-even point — closing costs divided by the monthly saving — against how long you expect to keep the house. Also check the lifetime figure, because extending the term can raise total cost even when the payment falls.

What is not included in these estimates?

HOA dues, closing costs, maintenance, utilities, and any rate changes on an adjustable-rate loan. Property tax and insurance are figures you supply rather than local data we look up.

Sources

How this page is produced

Editorial process. CentCompass is maintained independently, and this page is written and checked against the official publications listed above before it goes live. There is no separate editorial reviewer. This page was last checked on . See our editorial policy.

How the calculations work. Every result comes from a small, unit-tested calculation engine rather than a spreadsheet or a hardcoded table. Loans use the standard amortization formula, growth uses compound-interest math, income tax applies the federal progressive brackets, and payroll applies Social Security and Medicare rules. Our methodology sets out each one.

Where the figures come from. Tax brackets, standard deductions, FICA parameters, and contribution limits are stored once in a dated registry and read directly by the calculators — the same values appear in the text above, so the two can never drift apart. Each figure records its source, effective tax year, and review status on our data sources page.

Update policy. Regulatory figures are checked against their primary source when the IRS, SSA, or another authority publishes new values — typically each autumn for the following tax year — and again at the scheduled review date recorded for each dataset. Figures that have not been checked yet are marked as draft on the data sources page until that check is complete.

Educational purposes only — not financial, tax, or investment advice (disclaimer).