Mortgage Calculator

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Payment breakdown
Amortization schedule
Payment breakdown
Monthly Payment

How is my monthly payment calculated?
Principal and Interest
Private Mortgage Insurance
Property Tax
Homeowners Insurance
HOA/Other
Amortization schedule
Principal Remaining Interest Paid Principal Paid
Estimated Payoff
Apr 2026

Connect with a Mortgage Advisor Today!

Whether you’re buying a home or ready to refinance, our professionals can help.

Common Mortgage Calculator Terms

You can use our mortgage payments calculator to provide yourself with information about the estimated monthly mortgage payments you’ll make on a new home, with the option to include your anticipated tax, insurance and PMI costs. The following types of information can be entered into the mortgage calculator to give you great results:

By Home Price

Work forward based on the price of the home you want to figure out your best loan term and potential monthly payment.

By Affordability

Use your down payment and monthly budget to discover how much home you can afford, then save up to $3000 by comparing top lender quotes.

By Monthly Payment

Input your monthly payment to discover what kind of loan will work best for you, then fill out an application with a lender to verify the estimate.

Bi-Monthly Payment

Pay every other week instead of once a month and save thousands over your loan term by reducing the principal amount quickly.

Home Price

You can input the amount you plan to offer for the home of your dreams or run the numbers based on the home list price.

Down Payment

Take your savings, deduct the amount you’ll need for closing costs, and what’s left will serve you as a down payment.

Interest Rate

Remember that your interest rate will vary depending on the lender you choose, your loan program, and your credit score.

Loan Program

Depending on the type of loan you get (FHA, VA, USDA, or conventional), your finances will be impacted differently.

Property Tax

The assessed value of the home multiplied by the local tax rate will give you the estimated amount of your property tax.

Home Insurance

Home value and location will both impact how much you will have to pay for home insurance to protect your investment.

Monthly Private Mortgage Insurance

You’ll need to pay PMI ranging from 0.5% to 2% of the loan amount if your down payment amounts to less than 20% of the home price.

HOA Dues

A homeowners association (HOA) will charge monthly or annual dues, so find out if your home is located in an affected neighborhood.

Additional Principal Payment

If you can make a larger than required payment every month, the additional funds can go to reduce your loan principal.

Annual Income

Divide your annual income by 12 months to arrive at the monthly income that will be used when determining your ability to repay.

Monthly Debts

Add all recurring expenses or payments that you owe every month (like credit card bills or auto loan payments) to arrive at your monthly debt.

DTI

Compare your monthly income and monthly debt to find out what your debt to income (DTI) ratio is, the lower this number is, the better.

Desired Monthly Payment

A bigger monthly payment means you’ll pay off your loan more quickly, cutting years and interest costs off your mortgage.

Biweekly Payments

If you make half of a mortgage payment every other week, it works out to a whole extra mortgage payment every year.

Estimated Payoff

Ask your mortgage company to provide you with your amortization schedule so you can learn your estimated payoff date.
Rate Quote Expected

Rate quote isn’t what you expected?

If your instant rate quote isn’t what you expected, we can provide counsel on how to potentially transform your quote into something more acceptable. Sammamish Mortgage is a family-owned mortgage company with over 30 years of experience in the industry. We proudly serve customers in the Pacific Northwest region. We serve WA, ID, OR, CO and CA. If you’re looking to buy a home in one of these states, we can help!

Our Reviews

Laura
April 22, 2026
My family has used Sammamish Mortgage for every home purchase over many years. We just completed another loan. The company is great! Buying a home is a big process, but there was no stress related to working with Sammamish. Great communication and execution. The app is very easy to work with. Highly competent at all levels! Highly highly recommended!
Julie M
April 14, 2026
Ryan and the team at Sammamish made the process of buying a home extremely smooth and stress free. I so appreciate their attention to detail. I felt comfortable working with them and confident our loan would go through. We will definitely use them in the future when we purchase our next home in Seattle.
Eva Schoenleitner
April 13, 2026
An excellent mortgage firm. I just did a refi after buying my latest townhouse with them as well 6 months ago. Both went without a hitch. Sammamish has competitive rates and they were able to get me approved where others had challenges. I can highly recommend.
Sania Marri
March 31, 2026
Very helpful and always willing to answer my questions
Darren Jones
March 29, 2026
The staff at Sammamish mortgage is a pleasure to work with. Nick and Barb were particularly pleasant. They were always available for questions, timely with responses and progress, and clear with expectations.
Leno Balderas
March 26, 2026
(Translated by Google) Excellent service. Very friendly, attentive, and reliable in every way. Cristina's service was outstanding, 5 stars; I highly recommend them. (Original) Excelente servicio. Muy amables, atentos y confiables en todos los aspectos. La atención por parte de Cristina, desde 5 estrellas, lo recomiendo mucho
J
March 12, 2026
Highly recommend checking out Sammamish Mortgage. Going with a local, well known, highly respected mortgage broker like Sammamish Mortgage has a number of benefits. Not only do you get just as good rates as any other big-box broker or bank, you get dedicated, hands-on, personable, responsive, and consistent service! I had gotten quotes from Rocket, Loan depot, and Quicken, but those big box just bounce you from one customer service agent to another, and did not provide any better loan rate! Also, I had a selling agent tell me that if a Seller is choosing between identical offers, they would select an offer that works with Sammamish vs big-box brokers. Even realtors are frustrated with not being able to contact loan agents and encounter slow response times. I'm sure everyone at Sammamish are great, but in case you want name drops. . .Ryan was fantastic providing different options and recommendations based on my situation, floating out ideas and concepts I hadn't even heard of (like recasting your loan!). Shawn was also great on the processing side and was ALWAYS responsive during the entire process. Oh, and one more thing. . .Unlike other big-box brokers who bait you with calculating an instant offer but require you to provide your phone number and email. . .Sammamish shows their LIVE rates on their website WITHOUT requiring you to share your phone and email- YOU WON"T GET SPAM like I did with other brokers. Loan Depot was the worst, calling me 3 x a day for 2 weeks. (just google Loan Depot reviews online and you'll see what I'm saying). Sorry for the ramble. . .I just can't say enough about Sammamish Mortgage!

FAQs

What is a mortgage calculator used for?

A mortgage calculator estimates your monthly home loan payment based on the loan amount, interest rate, loan term, and other factors. It helps you understand what you’re likely to pay each month before you apply for a loan.

How does the mortgage calculator compute payments?

This tool takes the numbers you enter — such as loan amount, rate, and term — and applies them to a standard loan formula. It estimates your principal and interest payment, giving you an idea of what your mortgage might cost.

Can this tool include taxes and insurance?

Some mortgage calculators allow you to add estimated property taxes, homeowners insurance, and private mortgage insurance (PMI). You can include those to see a more complete picture of your total monthly housing payment.

Why should I use a mortgage calculator before applying?

Using a mortgage calculator helps you set realistic expectations about monthly payments based on today’s rates and your goals. It’s a useful planning step that gives you context before you talk to a loan officer or start the application process.

Does the calculator show how much interest I’ll pay over time?

Yes. By inputting your loan term and interest rate, the calculator can break down how much of each payment goes toward interest versus principal. That helps you see how much you’ll pay over the life of the loan.

What should I enter for the interest rate?

Use the interest rate you expect to qualify for based on current market conditions and your credit profile. If you’re unsure, you can use a published average rate as a placeholder and update it once you receive an actual quote.

Are the results exact?

The calculation gives a reliable estimate based on your inputs, but the final numbers on a loan offer may differ. Lender fees, rate locks, and other factors can influence your true payment. Think of this as a planning tool, not a final loan quote.

More Online Tools That Matter

Our additional mortgage calculator tools are also free, and use data from your unique loan situation to give you a better idea of your estimated monthly mortgage payments. You can update the amount of your budgeted home price, your down payment, the expected interest rate, and your anticipated loan term to make adjustments to your projected monthly payment.


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