Mortgage Payment Calculator: Work Out Your Monthly House Payment

A mortgage payment calculator tells you how much you'll pay each month before you sign loan papers. You input the home price, down payment, interest rate, loan term and local tax rates, and the tool returns your monthly principal and interest payment plus escrow costs for taxes and insurance.

That monthly number decides whether you can afford the house, how much cash you need at closing, and whether a 15-year or 30-year mortgage makes sense for your budget.

Principal is the chunk of your payment that reduces the loan balance. In year one of a 30-year mortgage you pay mostly interest; by year 25 most of each payment is principal.

Interest is the lender's fee, calculated as your annual percentage rate divided by 12 and multiplied by your current loan balance. A lower APR saves thousands over the life of the loan.

Homeowners insurance covers fire, theft and liability. Lenders require it.

PMI (private mortgage insurance) applies when your down payment is less than 20 %. It costs 0.5–1.5 % of the loan amount per year and drops off once you reach 20 % equity.

Follow these steps to get an accurate monthly payment estimate in under two minutes.

1. 1Enter the home price. Use the listing price or your planned offer amount.
2. 2Input your down payment. Enter a dollar amount or a percentage. 20 % avoids PMI; 3–5 % is common for first-time buyers using conventional or FHA loans.
3. 3Set the loan term. Choose 15, 20 or 30 years. Shorter terms mean higher monthly payments but far less total interest.
4. 4Add your interest rate. Check current rates on your lender's website or a rate-comparison tool. Even 0.25 % makes a multi-thousand-dollar difference over 30 years.
5. 5Enter your property tax rate. Look up your county's effective rate online (usually expressed as a percentage of assessed home value) or use the calculator's default.
6. 6Estimate homeowners insurance. A typical range is $1,000–$2,500 per year, or about $85–$210 per month. High-risk areas cost more.
7. 7Include HOA fees if applicable. Condo and planned-community fees run $200–$600 per month in many markets.
8. 8Review the results. The calculator displays monthly payment, total interest paid over the loan term, and an amortization schedule showing principal versus interest in each year.

Run the calculation three times: once at your target price, once at 10 % below, and once at 10 % above. That range shows you where you have breathing room and where you're stretched.

Here's a side-by-side comparison of a $350,000 home with 10 % down under two different loan terms.

The 15-year mortgage costs $648 more per month but saves $260,460 in interest. Your choice depends on cash flow: if $3,453 is more than 28 % of your gross monthly income, lenders may not approve the loan, and you may not sleep well even if they do.

A mortgage payment calculator shows you the true cost of homeownership before you fall in love with a property.

Most buyers focus on the purchase price, but monthly payment is what hits your bank account. A $400,000 house at 7.5 % costs nearly $400 more per month than the same house at 6.5 %, even though the price is identical.

Pre-approval letters rely on the same math. When you know your payment before you tour homes, you avoid wasting time on listings you can't finance and you make stronger offers because you've already stress-tested the budget.

Finally, calculators help you compare adjustable-rate mortgages (ARMs) to fixed-rate loans. An ARM might start at 5.5 % for five years, then adjust annually.

Using the list price instead of the offer price. In a buyer's market you may negotiate 5–10 % below asking. In a seller's market you may bid above list.

Forgetting HOA fees. Homeowners association dues are not included in PITI but they're just as mandatory. A $400 monthly HOA fee on top of a $2,500 mortgage changes affordability fast.

Skipping the amortization schedule. The schedule shows that in year one of a 30-year loan, 85 % of your payment is interest. By year 20, half is principal.

Not comparing loan terms. A 15-year mortgage at 6.0 % and a 30-year at 6.5 % may produce similar affordability outcomes when you factor in total interest. Always model both before deciding.

Interest rate and loan term are the two levers that move your monthly mortgage payment the most.

Interest rate is the annual cost of borrowing, expressed as APR. A $300,000 loan at 6.0 % costs $1,799 per month (principal and interest).

Loan term is the number of years you'll repay the loan. Shorter terms mean higher monthly payments but radically lower total interest.

On a $250,000 mortgage at 6.5 %:

• 30-year term: $1,580/month P&I, $318,800 total interest
• 20-year term: $1,866/month P&I, $197,840 total interest
• 15-year term: $2,177/month P&I, $141,860 total interest

Many buyers split the difference with a 20-year mortgage or take the 30-year loan and make extra principal payments when cash flow allows. Either strategy cuts years off the payoff and thousands off the interest.

Run a fresh mortgage payment calculator estimate whenever one of these five events happens.

Your credit score improves by 40+ points. A jump from 680 to 720 can unlock better rate tiers. Pull your score for free and rerun the numbers before you lock a rate.

You're ready to remove PMI. Once your loan balance falls to 80 % of the home's current value, request PMI cancellation. Your payment drops by the monthly PMI premium immediately.

You receive a bonus, inheritance or windfall. Use a calculator to model extra principal payments. A single $10,000 payment in year three of a $300,000 loan can shave two years and $30,000 in interest off a 30-year term.

For strategies to increase income and free up cash for bigger payments, explore our [career and income](/career-and-income) resources.

What is a mortgage payment calculator?

How accurate is a mortgage payment calculator?

Mortgage payment calculators are accurate for principal and interest to the dollar, because they use standard amortization formulas. Escrow estimates for taxes and insurance depend on the rates you input; actual costs vary by county and insurer.

Can I use a mortgage calculator if I'm self-employed?

Yes. A mortgage payment calculator works the same whether you're W-2 or self-employed; it only cares about loan amount and rate.

Should I use a 15-year or 30-year mortgage calculator?

Do mortgage calculators include closing costs?

No. Mortgage payment calculators estimate your recurring monthly payment, not one-time closing costs.

A mortgage payment calculator turns a home price into a monthly budget reality in seconds. Enter your loan details, adjust for taxes and insurance, and compare 15-year versus 30-year terms to find the payment that fits your income and goals.