Finance

Mortgage Calculator

Estimate monthly mortgage payments, total paid, and interest.

Formula reviewed: 2026-02-14 Finance

Mortgage Calculator estimates principal-and-interest payment, total housing payment, payoff timeline, and interest cost with optional taxes, insurance, HOA, and extra principal. It is useful for home-buying decisions, refinance comparisons, and budgeting realistic monthly carrying costs beyond base loan payment. The tool computes standard amortization outputs and includes a first-12-month breakdown so you can see how interest and principal split over time. Extra principal scenarios are included to show payoff acceleration and potential interest savings. Use it to compare financing options before committing to a mortgage plan.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

How to use this tool

Enter loan amount, rate, term, and optional monthly tax/insurance/HOA values.
Add optional extra principal payment, then click `Calculate`.
Review monthly totals, payoff months, interest impact, and the 12-month amortization preview.

Mortgage Inputs

Result

Principal + interest: $2,212.24

Total monthly housing payment: $2,212.24

Total paid (P&I only): $796,405.71

Total interest (P&I only): $446,405.71

Payoff months with extra principal: 360

Interest with extra principal: $446,405.71

Amortization Preview (First 12 Months)

Month	Interest	Principal Paid	Ending Balance
1	$1,895.83	$316.40	$349,683.60
2	$1,894.12	$318.12	$349,365.48
3	$1,892.40	$319.84	$349,045.63
4	$1,890.66	$321.57	$348,724.06
5	$1,888.92	$323.32	$348,400.74
6	$1,887.17	$325.07	$348,075.68
7	$1,885.41	$326.83	$347,748.85
8	$1,883.64	$328.60	$347,420.25
9	$1,881.86	$330.38	$347,089.87
10	$1,880.07	$332.17	$346,757.70
11	$1,878.27	$333.97	$346,423.74
12	$1,876.46	$335.78	$346,087.96

Embed this tool

Add this snippet to any website to render a compact ToolPatch widget without an iframe.

<div class="toolpatch-embed" data-toolpatch-tool="mortgage-calculator"></div>
<script async src="https://tool-patch.com/embed.js"></script>

Mortgage Payments and Amortization

A Loan Paid Down Over Time

A mortgage is usually an amortizing loan: each regular payment covers interest for the period and repays part of the principal. Early in the loan, most of the payment goes to interest because the outstanding balance is large. Later, more of the same payment goes to principal as the balance shrinks.

The standard payment formula depends on loan amount, interest rate, and number of payments. It creates a fixed payment for a fixed-rate mortgage, but the composition of that payment changes every month. This is why the amortization schedule is often more informative than the payment alone.

Interest Rate and Term

The interest rate affects both monthly payment and total interest paid. A higher rate increases the cost of borrowing and slows principal reduction. The term affects affordability and total cost. A longer term lowers the monthly payment but usually increases total interest because the balance remains outstanding longer.

A shorter term does the opposite: higher monthly payment, faster payoff, and lower total interest. The best choice depends on income stability, opportunity cost, liquidity needs, and risk tolerance. Mortgage math can show the tradeoff, but it cannot decide the household priorities.

Beyond Principal and Interest

Real housing payments often include property taxes, insurance, mortgage insurance, homeowners association fees, maintenance, and utilities. Escrow may bundle taxes and insurance into the monthly payment, but those costs are not interest or principal.

Affordability should consider the full ownership cost, not just the loan payment. A low mortgage payment can still be stressful if taxes, repairs, commuting costs, or rate resets are ignored. Sound planning includes both the amortization math and the cash-flow reality around it.

Prepayments and Refinancing

Extra principal payments reduce the balance faster and can save interest, especially early in the loan. The effect depends on whether the lender applies the extra amount to principal and whether prepayment penalties exist.

Refinancing replaces one loan with another, often to lower the rate, change the term, or access equity. The decision depends on closing costs, break-even time, tax context, and how long the borrower expects to keep the loan. A lower payment is attractive, but total cost over time deserves equal attention.

Formula or method

The principal-and-interest payment uses the standard fixed-rate amortization formula.
Optional taxes, insurance, and HOA amounts are added to the monthly housing payment but do not reduce principal.
Extra principal reduces the remaining balance faster when the lender applies it directly to principal.

Worked example

Comparing a baseline monthly payment

Loan amount: $350,000
Annual interest rate: 6.5%
Term: 30 years
Taxes, insurance, and HOA entered separately if known

Result: The calculator estimates the principal-and-interest payment, then adds monthly housing costs to show a fuller carrying-cost estimate.

The amortization preview shows why early payments are interest-heavy and why extra principal has the largest impact early in the loan.

How to interpret the result

Monthly principal and interest is not the same as total housing cost.
Total interest shows borrowing cost over the full term if the rate and payment schedule do not change.
Extra principal scenarios show potential savings, but lender rules and prepayment penalties can change the real outcome.
Refinance comparisons should include closing costs and the expected time you will keep the new loan.

Common mistakes

Comparing loans by monthly payment only and ignoring total interest.
Forgetting property taxes, insurance, HOA fees, maintenance, or mortgage insurance.
Assuming advertised rates are the same as APR after fees and points.
Treating prepayment savings as guaranteed without checking lender rules.

Review note and limitations

Method - standard fixed-rate amortization formula with optional housing cost add-ons.

Educational and planning use only. Mortgage rules, taxes, insurance, APR disclosures, fees, and lending requirements vary by lender and jurisdiction.

FAQ

Does this mortgage calculator include taxes and insurance?

It supports optional monthly taxes, insurance, and HOA values so you can estimate a fuller housing payment.

Is the payment the same as APR?

No. The payment uses the interest rate and entered costs. APR may include lender fees, points, and other finance charges.

Can this compare refinancing options?

It can model payment and interest changes, but you should also compare closing costs, break-even time, and how long you expect to keep the loan.

Explore more versions

Tailored guides for specific audiences, regions, and scenarios.

core

Mortgage Calculator

Input Pattern

How to use this tool

Mortgage Inputs

Result

Amortization Preview (First 12 Months)

Embed this tool

Mortgage Payments and Amortization

A Loan Paid Down Over Time

Interest Rate and Term

Beyond Principal and Interest

Prepayments and Refinancing

Formula or method

Worked example

Comparing a baseline monthly payment

How to interpret the result

Common mistakes

Review note and limitations

FAQ

Explore more versions

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