Mortgage Payment Calculator

Follow these steps to calculate your monthly mortgage payment using this tool:

1. Enter the Home Price — Type the full purchase price of the property you are considering. This should be the agreed-upon sale price or listing price. For example, enter $350,000 for a typical U.S. median-priced home.
2. Set Your Down Payment Percentage — Input the percentage of the home price you plan to pay upfront. A 20% down payment is the traditional benchmark because it allows you to avoid Private Mortgage Insurance (PMI), which typically costs 0.5%–1.5% of the loan balance annually. However, many first-time buyer programs accept 3%–5% down.
3. Enter the Annual Interest Rate — Input the rate quoted by your lender. You can use the step buttons to adjust by 0.125% increments, which matches how lenders typically price rates. If you have not yet received a quote, use current market averages as a starting point (around 6.5% for a 30-year fixed as of early 2026).
4. Choose the Loan Term — Select either 15 years or 30 years. A 15-year term means higher monthly payments but dramatically less total interest. A 30-year term keeps payments lower and more manageable month-to-month.

Once you click calculate, review the four result fields:

• Monthly Payment — Your principal and interest payment each month.
• Total Interest Paid — The cumulative interest over the full loan term.
• Total Cost of Loan — Principal plus all interest combined.
• Down Payment Amount — Your upfront cash requirement in dollars.

Pro tips: Run the calculator multiple times to compare scenarios. Try 15-year vs. 30-year terms side by side. Experiment with larger down payments to see how they reduce your monthly mortgage payment. If your down payment is below 20%, remember to mentally add PMI (roughly $50–$150/month per $100,000 borrowed) to get a more realistic picture of your mortgage calculator with taxes and insurance costs.

A mortgage calculator is a financial tool that estimates your monthly mortgage payment based on the purchase price, down payment, interest rate, and loan duration. Mortgage lending has a long history in the United States, dating back to the 1930s when the Federal Housing Administration (FHA) introduced long-term, fixed-rate home loans to make homeownership accessible to everyday Americans. Today, roughly 65% of U.S. households own their home, and for most of them, the mortgage is the single largest monthly expense.

There are two primary types of mortgage loans. A fixed-rate mortgage locks in the same interest rate for the entire loan term — typically 15 or 30 years — so your monthly mortgage payment never changes. An adjustable-rate mortgage (ARM) starts with a lower introductory rate for a set period (commonly 5 or 7 years), then adjusts periodically based on market indexes. This calculator focuses on fixed-rate loans, which account for approximately 90% of all new mortgage originations.

Understanding how to calculate mortgage payment amounts is essential for responsible budgeting. Your total monthly housing cost is often described using the acronym PITI: Principal, Interest, Taxes, and Insurance. While this calculator computes the principal and interest portion, keep in mind that property taxes (averaging roughly 1.1% of home value nationally) and homeowners insurance ($1,500–$3,000 per year for a typical home) add meaningfully to your total obligation. Lenders generally recommend that your total housing payment not exceed 28% of your gross monthly income.

As of early 2026, average 30-year fixed mortgage rates hover in the mid-6% range, significantly above the historic lows of 2.65% seen in January 2021. Even small rate differences matter: on a $300,000 loan, the difference between 6.0% and 7.0% adds roughly $72,000 in total interest over 30 years.

Disclaimer: This mortgage calculator provides estimates for educational purposes only. It does not constitute financial advice. Consult a qualified mortgage lender or financial advisor before making any home-buying decisions.

The standard fixed-rate mortgage payment formula, also known as the amortization formula, is used by virtually every bank and lender to determine how to calculate mortgage payment amounts:

M = P × [r(1 + r)n] / [(1 + r)n − 1]

Intuitively, the mortgage payment formula balances two competing demands: the lender needs to earn interest on the outstanding balance, and the borrower needs to fully repay the principal by the end of the term. The formula ensures that every single monthly payment is the same dollar amount, but the composition of each payment shifts over time.

In the early years of a 30-year mortgage, the majority of each payment goes toward interest because the outstanding principal balance is at its highest. For example, on a $280,000 loan at 6.5%, the very first monthly payment of $1,770 breaks down to approximately $1,517 in interest and only $253 in principal. By year 15, the split is roughly even. In the final years, nearly the entire payment reduces the principal.

This front-loaded interest structure is why making even small extra principal payments early in the loan term can save tens of thousands of dollars and shave years off your mortgage. A single extra payment of $1,770 in year one saves roughly $4,200 in total interest on a 30-year loan at 6.5%.

Below are three worked examples showing how to calculate mortgage payment amounts for common home-buying scenarios.

Example 1: First-Time Buyer

• Home price: $300,000
• Down payment: 10% ($30,000)
• Loan amount: $270,000
• Interest rate: 6.8% (monthly rate: 0.005667)
• Term: 30 years (360 payments)

Plugging into the mortgage payment formula:

M = 270,000 × [0.005667 × (1.005667)360] / [(1.005667)360 − 1]

First, calculate (1.005667)³⁶⁰ = 7.6897. Then:

M = 270,000 × [0.005667 × 7.6897] / [7.6897 − 1] = 270,000 × 0.04358 / 6.6897 = 270,000 × 0.006514 ≈ $1,759

The monthly mortgage payment is approximately $1,759. Over 30 years, total payments equal $633,240, meaning total interest paid is about $363,240. Note: with only 10% down, this buyer would also pay PMI of roughly $113–$338/month until reaching 20% equity.

Example 2: Move-Up Buyer

• Home price: $500,000
• Down payment: 20% ($100,000)
• Loan amount: $400,000
• Interest rate: 6.5% (monthly rate: 0.005417)
• Term: 30 years (360 payments)

Using the formula: M = 400,000 × 0.006321 ≈ $2,528

Total paid over 30 years: $910,080. Total interest: $510,080. With 20% down, no PMI is required, saving an estimated $167–$500/month compared to a lower down payment scenario.

Example 3: Aggressive Payoff — 15-Year vs. 30-Year Comparison

• Home price: $350,000
• Down payment: 20% ($70,000)
• Loan amount: $280,000
• Interest rate: 6.5%

Choosing the 15-year term costs an extra $671/month but saves nearly $197,966 in total interest — a massive difference. The 15-year buyer also builds equity twice as fast, owning their home outright in half the time. If your budget can handle the higher monthly mortgage payment, the 15-year option is one of the most powerful wealth-building moves available to homeowners.