Mortgage guide

Calculate Your Monthly Mortgage Payment Instantly

A mortgage is a loan used to purchase a home or real estate. The borrower repays the loan over time through monthly payments that cover principal, interest, taxes, and insurance—commonly abbreviated as PITI. For most Americans, a mortgage is the largest financial commitment they will ever make, which is why understanding how these loans work can save you tens of thousands of dollars over the life of your loan.

How Mortgages Work

When you buy a home, the lender pays the seller on your behalf. You then repay the lender over time—typically 15 or 30 years—through monthly payments. Each payment reduces your principal balance and covers the interest that has accrued since the last payment.

In the early years of a mortgage, most of your payment goes toward interest rather than principal. This is called amortization. For example, on a $300,000 mortgage at 6.5% over 30 years, your monthly payment would be about $1,896. In month one, roughly $1,625 of that goes to interest and only $271 reduces the principal. By year 20, the ratio reverses—more of each payment chips away at the balance.

Understanding amortization reveals a powerful strategy: extra payments. Making just one extra principal payment per year on a 30-year mortgage can shorten the loan by four to five years and save tens of thousands in total interest. Even an extra $100 a month makes a meaningful difference.

Types of Mortgages

Fixed-rate mortgages maintain the same interest rate for the entire loan term, making budgeting predictable. The two most common terms are 15 and 30 years. A 15-year mortgage builds equity faster and costs significantly less in total interest, but requires higher monthly payments. A 30-year mortgage lowers the monthly payment, giving you flexibility—but you pay far more interest over time.

Adjustable-rate mortgages (ARMs) offer a lower initial rate that adjusts periodically based on a market index. A 5/1 ARM keeps the rate fixed for five years, then adjusts annually. ARMs can make sense if you plan to sell or refinance before the adjustment period, but carry the risk of rising payments if rates climb.

FHA loans are backed by the Federal Housing Administration and allow down payments as low as 3.5% with a credit score of 580 or higher. They require mortgage insurance for the life of the loan (unless you put 10% down, after which it drops off after 11 years).

VA loans are available to qualifying veterans, active-duty service members, and surviving spouses. They typically require no down payment and no private mortgage insurance, making them among the most favorable loan types available.

Jumbo loans exceed the conforming loan limits set by Fannie Mae and Freddie Mac—$766,550 in most areas for 2024. They often carry stricter qualification requirements and slightly higher rates.

USDA loans help rural and some suburban buyers who meet income limits purchase homes with zero down payment.

Mortgage Interest Rates

Your mortgage rate is shaped by factors you can control and broader market forces you cannot. The controllable factors include your credit score, loan-to-value ratio (how much you borrow relative to the home's value), debt-to-income ratio, and the loan type you choose.

Credit score has a major impact. A borrower with a 760+ score might qualify for a rate 0.5% to 0.75% lower than someone with a 680 score. On a $300,000 loan over 30 years, that gap adds up to more than $35,000 in total interest.

Down payment size matters too. Putting 20% down signals lower risk to lenders and often unlocks better pricing. Choosing a 15-year term instead of 30-year almost always comes with a lower rate as well.

The broader rate environment—driven by Federal Reserve policy, inflation expectations, and bond market activity—determines the baseline from which lenders price their loans. Rates can shift by 0.25% or more in a single week during volatile periods.

To get the best rate, compare offers from at least three lenders on the same day. Include local banks, credit unions, and online lenders. Rate-shopping within a 45-day window typically counts as just one credit inquiry.

Monthly Mortgage Payments

Your monthly mortgage payment has up to four components, often called PITI:

Principal is the portion of your payment that reduces the loan balance. Interest is the cost of borrowing. Property taxes are collected monthly and held in an escrow account to pay your annual tax bill. Homeowners insurance is also escrowed to cover damage and liability.

If your down payment is less than 20% on a conventional loan, you will typically pay private mortgage insurance (PMI). PMI costs roughly 0.5% to 1.5% of the loan amount per year. On a $300,000 loan, that is $125 to $375 per month. You can request PMI removal once your equity reaches 20%, and it is automatically removed when you reach 22% based on the original amortization schedule.

To illustrate: on a $350,000 home with 10% down ($315,000 loan) at 6.75% for 30 years, the principal and interest portion is approximately $2,043 per month. Add estimated taxes ($400), insurance ($150), and PMI ($200) and the all-in payment reaches around $2,793. This is why it is important to budget well beyond the base payment.

Mortgage Calculator

A mortgage calculator lets you model payment scenarios before you ever speak with a lender. Enter the home price, down payment amount, interest rate, and loan term to get an instant estimate of your monthly payment and total interest cost.

Use the calculator to answer real questions: How does increasing the down payment by $10,000 affect the payment? What would a 15-year term cost per month compared to 30 years? At what purchase price does the monthly payment fit your budget?

Our free mortgage calculator on the homepage includes a full breakdown of principal and interest over the life of the loan, so you can see exactly how your balance decreases over time.

How Much House Can You Afford

A widely used guideline is to keep total housing costs—principal, interest, taxes, and insurance—at or below 28% of your gross monthly income. Total debt payments, including the mortgage, should stay below 36%. Lenders call this the 28/36 rule.

For example, if your household earns $8,000 per month before taxes, you would ideally keep housing costs at or below $2,240 and total debt payments at or below $2,880.

Lenders calculate your debt-to-income ratio (DTI) by dividing total monthly debt payments by gross monthly income. Most conventional loans require a DTI below 43%, though lower is better. Some loan programs allow higher DTIs with compensating factors such as substantial cash reserves or a high credit score.

Remember that what you qualify for and what is comfortable for your life are often different numbers. Account for maintenance (typically 1% of home value per year), utilities, HOA fees if applicable, and your other financial goals before stretching to the maximum loan amount.

Mortgage Pre-Approval

Pre-approval is a lender's conditional commitment to lend you a specific amount after reviewing your financial documents. It typically requires recent pay stubs, two years of tax returns, two to three months of bank statements, and authorization for a hard credit pull.

Pre-approval is meaningfully stronger than pre-qualification, which is just an estimate based on self-reported information and does not involve verifying documents or pulling credit. In competitive housing markets, many sellers will not consider an offer without a pre-approval letter.

Pre-approval letters are usually valid for 60 to 90 days. If your search takes longer, you may need to refresh your documents and get a new letter. Pre-approval also helps you negotiate with confidence because you already know your realistic price range and have demonstrated to sellers that financing is likely to close.

Down Payment

The size of your down payment affects your loan balance, monthly payment, whether you owe PMI, and sometimes your interest rate. The traditional 20% benchmark avoids PMI, but many buyers put down less.

Conventional loans can be obtained with as little as 3% down through programs like Fannie Mae HomeReady or Freddie Mac Home Possible, which are designed for first-time and moderate-income buyers.

The trade-off is real: on a $400,000 home, going from 5% down ($20,000) to 20% down ($80,000) eliminates PMI and reduces the loan by $60,000—saving substantial interest and building equity faster.

Down payment assistance programs (DPA) are available through state housing finance agencies, nonprofits, and some lenders. Many offer grants or low-interest second mortgages to help buyers bridge the gap. Check with your state's housing finance agency for programs you may qualify for.

Regardless of program, aim to keep enough cash in reserve after your down payment. Most lenders want to see at least two months of mortgage payments sitting in your account at closing.

Closing Costs and Fees

Closing costs typically run 2% to 5% of the loan amount and are paid at closing, in addition to the down payment. On a $300,000 loan, plan for $6,000 to $15,000 in closing costs.

Common closing costs include: loan origination fee (0.5% to 1% of the loan), appraisal ($400 to $700), title insurance ($500 to $1,500), title search ($100 to $250), home inspection ($300 to $500, paid before closing), recording fees ($50 to $200), prepaid taxes and insurance held in escrow (one to three months worth), and discount points if you choose to buy down the rate (one point equals 1% of the loan amount and typically reduces the rate by 0.25%).

Lenders are required to give you a Loan Estimate within three business days of application that itemizes all expected costs. Review it carefully and compare it against estimates from other lenders. You can also ask sellers to cover some closing costs—called seller concessions—particularly in a buyer's market.

Tips for Getting a Mortgage

Start improving your credit at least six months before applying. Request free reports from AnnualCreditReport.com, dispute any errors, pay down revolving balances to below 30% of your limit, and avoid opening new credit accounts.

Avoid major financial changes while your loan is in process. Do not quit your job, take on new debt, make large purchases, or transfer large sums between accounts without asking your loan officer first. These changes can delay or derail the loan.

Shop multiple lenders. Get quotes from at least three to five lenders—including local banks, credit unions, and online lenders—on the same day so comparisons are apples to apples. Even a 0.25% rate difference saves thousands over 30 years.

Lock your rate once you have a property under contract and rates are at a level you are comfortable with. Rate locks typically last 30 to 60 days. If closing looks like it may be delayed, ask about lock extensions early.

Conclusion

A mortgage is a long-term commitment that deserves careful comparison and planning. Understanding the types of loans available, what drives your interest rate, and the full range of associated costs puts you in a position to make a confident, informed decision. Use the free mortgage calculator to model different scenarios before you begin shopping, and speak with a licensed mortgage professional about your specific financial situation before making an offer.

Frequently Asked Questions