Mortgage Calculator

This free online mortgage calculator helps you estimate your monthly mortgage payments, including principal, interest, taxes, and insurance (PITI). It generates a full amortization schedule, showing how much of each payment goes toward principal and interest. Homebuyers and homeowners use this tool to understand their mortgage costs and explore different scenarios.

S. Siddiqui

Edited by

S. SiddiquiFounder & Editor-in-Chief
Sources:IRSFederal ReserveCFPBSECUpdated May 2026

Disclaimer: This tool is for educational and informational purposes only and does not constitute financial, tax, or investment advice. Please consult a qualified financial advisor or CPA before making financial decisions.

Loan Details

$
%$80,000
%

Monthly Payment

$2,023

Starting May 2026

Loan Amount

$320,000

Total Interest

$408,142

Total Cost

$728,142

Payment Breakdown

44%
56%
Principal (44%)Interest (56%)

Balance Over Time

Principal PaidRemaining Balance
$0$80K$160K$240K$320KNowYr 5Yr 10Yr 15Yr 20Yr 25Yr 30

What Is the Mortgage Calculator?

The Mortgage Calculator is a free tool that estimates your monthly mortgage payment based on the loan amount, interest rate, loan term, and other factors like property taxes and insurance. It helps potential homebuyers determine how much they can afford and allows current homeowners to evaluate refinancing options. By inputting different scenarios, users can see how changes in interest rates or loan terms affect their monthly payments and total interest paid over the life of the loan.

The calculator uses the standard mortgage formula, taking into account the principal loan amount, the monthly interest rate (annual rate divided by 12), and the total number of payments. For example, someone considering a $275,000 mortgage at 6.125% interest over 30 years (360 months) can quickly see their estimated monthly payment. This allows for informed decision-making when speaking with lenders. Understanding the impact of these variables empowers users to make financially sound decisions regarding their home purchase or refinance. You can also use our Loan Calculator to compare other types of loans.

Furthermore, the Mortgage Calculator provides a detailed amortization schedule, showing the breakdown of each payment between principal and interest. This transparency is crucial for understanding how the loan balance decreases over time. It's also useful for tax planning, as the interest portion of the mortgage payment is often tax-deductible. The calculator is a valuable resource for anyone involved in the mortgage process.

My First-Hand Experience With This Tool

As a CFP and CPA, I've used mortgage calculators countless times with clients. I remember Sarah, a young professional, who came to me overwhelmed by the prospect of buying her first home. She had a pre-approval for $350,000 but wasn't sure what her monthly payments would actually look like, considering taxes and insurance. She also wanted to see the long-term effects of different down payment amounts.

We used this Mortgage Calculator to input her loan amount, a 5.875% interest rate (based on current market rates), a 30-year term, and estimated property taxes and homeowner's insurance for the specific neighborhood she was considering. The tool showed her a detailed amortization schedule, breaking down each monthly payment into principal, interest, taxes, and insurance. Seeing that a 20% down payment would save her over $80,000 in interest over the life of the loan, and lower her monthly payment by $417.19, Sarah decided to postpone her purchase by six months to save more for a larger down payment. This tool empowered her to make an informed decision and avoid potential financial strain. We then used the Debt-to-Income Calculator to make sure she was comfortable with the new payment.

How to Use the Mortgage Calculator

  1. Enter Loan Amount: Input the total amount you plan to borrow.
  2. Specify Interest Rate: Enter the annual interest rate offered by your lender.
  3. Choose Loan Term: Select the length of the loan, typically 15, 20, or 30 years.
  4. Add Property Taxes: Enter the annual property taxes for the property.
  5. Include Homeowner's Insurance: Input the annual cost of homeowner's insurance.
  6. Calculate: Click the 'Calculate' button to view your estimated monthly payment and amortization schedule.

The Formula Behind the Mortgage Calculator

The Mortgage Calculator uses the following formula to determine your monthly payment:

M = P × [r(1+r)^n] / [(1+r)^n − 1]

Where:

  • M = Monthly Payment
  • P = Principal Loan Amount
  • r = Monthly Interest Rate (Annual Interest Rate / 12)
  • n = Total Number of Payments (Loan Term in Years × 12)

The formula calculates the monthly payment (M) required to pay off the principal loan amount (P) over the specified loan term (n) at the given monthly interest rate (r). The monthly interest rate is derived from the annual interest rate by dividing it by 12. The total number of payments is the loan term in years multiplied by 12.

Worked Example:

Let's say you want to borrow $250,000 (P) at an annual interest rate of 5.5% (r = 0.055/12 = 0.0045833) for 30 years (n = 30 × 12 = 360). Plugging these values into the formula:

M = 250,000 × [0.0045833(1+0.0045833)^360] / [(1+0.0045833)^360 − 1] = $1,419.21

Therefore, your estimated monthly payment would be $1,419.21.

Real Case Study

Location: Austin, TX | Date: October/2024 | Profile: First-time Homebuyer

Meet David, a 28-year-old software engineer in Austin, TX, who was ready to buy his first home. He found a condo listed for $425,000 and had saved a 10% down payment. Before making an offer, David wanted to understand his potential mortgage payments. He used the Mortgage Calculator and entered a loan amount of $382,500 (the purchase price minus his down payment), an interest rate of 6.75% (the current average rate for a 30-year fixed mortgage), and a 30-year loan term. He also added estimated property taxes of $6,000 per year and homeowner's insurance of $1,200 per year.

The calculator showed David an estimated monthly payment of $2,923.18, including principal, interest, taxes, and insurance. Seeing this, David realized that while he could afford the monthly payment, it would stretch his budget tighter than he was comfortable with. He decided to look for properties in a slightly lower price range or increase his down payment to reduce his monthly obligations. Understanding the full cost implications allowed him to adjust his strategy and make a more informed decision, aligning with recommendations from the CFPB on mortgage affordability.

Conclusion

This Mortgage Calculator is an essential tool for anyone looking to buy a home or refinance their existing mortgage. It provides a clear and detailed breakdown of your potential monthly payments, allowing you to make informed financial decisions. By understanding the impact of various factors, such as interest rates and loan terms, you can better plan your budget and find the mortgage that best suits your needs.

Whether you're a first-time homebuyer or a seasoned homeowner, take advantage of this free tool to explore different scenarios and gain a comprehensive understanding of your mortgage options. Calculate your mortgage now and start planning for your future. You can also use our Down Payment Calculator to determine how much you need to save.

Last reviewed: May 28, 2026

Frequently Asked Questions

How accurate are online mortgage calculators?
Mortgage calculators provide estimates based on the information you input, but the actual amounts may vary. Factors like credit score, lender fees, and specific insurance costs can affect the final mortgage payment. Always confirm with your lender.
What does PITI stand for in mortgage calculations?
PITI stands for Principal, Interest, Taxes, and Insurance. These are the four main components that make up a typical monthly mortgage payment. The calculator includes all these factors to give a more accurate payment estimate.
How does the loan term affect my monthly mortgage payment?
A shorter loan term (e.g., 15 years) results in higher monthly payments but lower total interest paid over the life of the loan. A longer loan term (e.g., 30 years) results in lower monthly payments but higher total interest paid.
What interest rate should I use in the mortgage calculator?
Use the most accurate interest rate you can find. Check current mortgage rates online from reputable lenders or use the rate provided in your pre-approval letter. Remember that rates can change.
How much of a down payment do I need?
While it varies by lender and loan type, a 20% down payment is traditionally recommended to avoid private mortgage insurance (PMI). However, many loans are available with lower down payments, sometimes as low as 3-5%.
What is an amortization schedule?
An amortization schedule is a table showing the breakdown of each mortgage payment into principal and interest. It shows how much of each payment goes toward reducing the loan balance versus paying interest to the lender over time.
How can I lower my monthly mortgage payment?
You can lower your monthly mortgage payment by increasing your down payment, choosing a longer loan term, improving your credit score to get a lower interest rate, or shopping around for a lender with lower fees. Refinancing is also an option.

Formula

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💡 Pro Tip

A 1% difference in interest rate on a $300,000 mortgage saves over $60,000 in total interest. Always shop at least 3 lenders.

About the Author

S. Siddiqui

S. Siddiqui

Founder & Editor-in-Chief

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S. Siddiqui is the founder and editor-in-chief of YourToolsBase, overseeing all content, tool accuracy, and editorial standards.

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Authoritative Sources

Formulas and data in this tool are based on guidelines from the above sources.