Mortgage Calculator

How to Calculate Your Mortgage in 2026

Buying a home is one of the most significant financial decisions you will ever make. Understanding exactly how much your monthly mortgage payment will be - and how that payment breaks down across principal, interest, taxes, and insurance - is essential to budgeting responsibly. Whether you are a first-time homebuyer or refinancing an existing property, a reliable mortgage calculator gives you the clarity you need to compare loan offers, evaluate down payment scenarios, and plan for the long term.

Understanding the Four Components of a Mortgage Payment

Most mortgage payments consist of four parts, often abbreviated as PITI: Principal, Interest, Taxes, and Insurance. Each component plays a distinct role in your total monthly obligation.

Principal is the amount you borrowed to purchase the home. Each month, a portion of your payment reduces the principal balance. Over the life of a 30-year fixed-rate mortgage, your monthly principal payment starts small and grows over time as the loan amortizes. Interest is the cost of borrowing money, calculated as a percentage of the remaining loan balance. In the early years of a mortgage, the majority of your payment goes toward interest. As you pay down the principal, the interest portion shrinks.

Property taxes are levied by local governments based on the assessed value of your home. These taxes fund schools, infrastructure, and public services. Tax rates vary widely - from under 0.3% in parts of Hawaii to over 2% in parts of Texas and New Jersey. Your lender typically collects property taxes as part of your monthly payment and holds them in an escrow account, paying the tax bill on your behalf when it is due.

Homeowners insurance protects your property against damage from fire, storms, theft, and other covered perils. Lenders require you to carry at least enough insurance to cover the replacement cost of the home. Like property taxes, insurance premiums are often paid into an escrow account and disbursed by the lender.

The Mortgage Payment Formula Explained

The standard formula lenders use to calculate your monthly principal and interest payment is the amortization formula:

M = P x [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]

Where M is your monthly principal and interest payment, P is the loan amount (home price minus down payment), r is the monthly interest rate (your annual rate divided by 12), and n is the total number of monthly payments (loan term in years multiplied by 12).

For example, on a ,000 loan at 6.5% for 30 years, the monthly principal and interest payment works out to approximately ,276. Adding per month for property taxes and for insurance brings the total to roughly ,676 per month. This is the number you need to know when evaluating whether a home fits your budget.

Why Your Down Payment Matters More Than You Think

Your down payment directly affects three things: your loan amount, your interest rate, and whether you need to pay Private Mortgage Insurance (PMI). A larger down payment means a smaller loan, which reduces your monthly payment and total interest. It also signals lower risk to lenders, often resulting in a better interest rate.

Putting down less than 20% typically requires PMI, which adds 0.5% to 1% of the loan amount per year to your costs. On a ,000 loan, that could mean an extra to per month. Once you reach 20% equity, you can request PMI cancellation.

Fixed-Rate vs. Adjustable-Rate Mortgages

A fixed-rate mortgage locks in your interest rate for the entire loan term. Your principal and interest payment never changes, making budgeting predictable. Fixed-rate loans are the most popular choice, especially when rates are historically low or moderate.

An adjustable-rate mortgage (ARM) offers a lower initial rate for a set period - typically 5, 7, or 10 years - after which the rate adjusts periodically based on a market index. ARMs can save money if you plan to sell or refinance before the adjustment period ends, but they carry the risk of higher payments if rates rise.

How Loan Term Affects Your Total Cost

The most common loan terms are 15 years and 30 years. A 15-year mortgage has higher monthly payments but significantly lower total interest. On a ,000 loan at 6.5%, a 30-year term results in total interest of roughly ,000, while a 15-year term cuts total interest to about ,000 - a savings of over ,000. The trade-off is that the 15-year monthly payment is about 50% higher.

Some lenders offer 20-year, 25-year, or 40-year terms. Experiment with different terms in the calculator above to find the balance between an affordable monthly payment and the lowest total cost over the life of the loan.

Additional Costs Homebuyers Often Overlook

Beyond PITI, homeownership comes with several other recurring costs. Maintenance and repairs typically run 1% to 2% of the home value annually. Utilities, HOA fees, and landscaping add to your monthly outflow. Closing costs - typically 2% to 5% of the loan amount - are a one-time expense at purchase. Factoring these into your budget ensures you are truly prepared for the cost of homeownership.

Using This Calculator to Make Smarter Decisions

The calculator above lets you adjust every variable in real time. Try different down payment amounts to see how much you can save on PMI and total interest. Compare a 15-year term against a 30-year term. See how a lower interest rate - even half a percentage point - can save tens of thousands of dollars over the life of the loan. All calculations happen instantly in your browser, with no data sent anywhere.