Mortgage Calculator
Compute a homeowner's monthly payment and full amortization with clear breakdown of principal, interest, property tax, home insurance, PMI, and HOA. This comprehensive mortgage calculator helps you understand the true cost of homeownership by including all monthly expenses. Enter your home price, down payment, interest rate, and loan term to see your base P&I payment. Then customize with local property tax rates, annual insurance costs, PMI (automatically calculated for LTV > 80%), and HOA dues. The tool generates a complete month-by-month amortization schedule showing how each payment is split between principal and interest, tracks cumulative interest paid, and displays when PMI will automatically drop off at 80% LTV. Add extra monthly payments to see dramatic interest savings and accelerated payoff dates. Export the full schedule to CSV for detailed planning. All calculations use standard fixed-rate mortgage formulas with monthly compounding, matching what lenders use. Everything runs locally in your browser with complete privacy.
What Is a Mortgage Calculator?
A mortgage calculator estimates your monthly home loan payment by combining four costs into one number: principal, interest, property taxes, and homeowner's insurance — often written as PITI. Most lenders also fold in PMI (private mortgage insurance) when your down payment is below 20%, and HOA dues if your property has them. Understanding what drives each component matters more than most buyers realize. A $400,000 mortgage at 6.5% costs $2,528/month in principal and interest alone. That same loan at 7.5% runs $2,797 — a difference of $269 every single month, or $96,840 over 30 years. The mortgage calculator on this page handles all of that math instantly, including an amortization schedule that shows exactly how much of each payment goes to interest versus principal in years 1, 10, and 20.
How to Use This Mortgage Calculator
Enter the home price and your down payment amount. The calculator will compute the loan amount automatically. Set your interest rate — check current 30-year fixed rates from your bank or a site like Bankrate the day you run this. Choose your loan term (30 years is standard; 15 years builds equity faster but raises monthly payments by roughly 40%). Add your estimated property taxes (your county assessor's website lists the current millage rate), homeowner's insurance (roughly $100–$200/month for most homes), and PMI if your down payment is under 20%. Hit calculate. The output shows your monthly payment, total interest over the loan life, and a full amortization table.
Worked Example: The Rivera Family's $425,000 Purchase
Marcus and Sofia Rivera are buying their first home in Charlotte for $425,000. They've saved $42,500 — exactly 10% down. Their lender quotes 7.1% on a 30-year fixed mortgage. Charlotte's property tax rate is 1.06%, which works out to $375/month. Their homeowner's insurance comes in at $132/month. And because they're under 20% down, they owe PMI of roughly $148/month (0.42% annually on the $382,500 loan).
Principal + Interest: $2,570
Property Taxes: $375 | Insurance: $132 | PMI: $148
Total Monthly Payment: $3,225
PMI drops off in year 9 when the loan balance hits $340,000 (80% LTV), saving $148/month going forward
Mortgage Payment Reference Table — Common Home Prices at 7.0% APR
| Home Price | 10% Down | Loan Amount | P&I Only | Est. Total PITI | Total Interest (30yr) |
|---|---|---|---|---|---|
| $250,000 | $25,000 | $225,000 | $1,497 | $2,050 | $313,920 |
| $325,000 | $32,500 | $292,500 | $1,946 | $2,610 | $407,840 |
| $400,000 | $40,000 | $360,000 | $2,395 | $3,100 | $502,200 |
| $500,000 | $50,000 | $450,000 | $2,994 | $3,850 | $627,840 |
| $600,000 | $60,000 | $540,000 | $3,593 | $4,550 | $753,480 |
| $750,000 | $75,000 | $675,000 | $4,491 | $5,640 | $941,760 |
Estimates only. PITI includes $350/mo taxes + $120/mo insurance + PMI where applicable. Actual figures vary by location and lender.
Key Mortgage Concepts Explained
Amortization is the process of paying down a loan in scheduled installments. Early payments are almost entirely interest — on a $360,000 loan at 7%, your very first payment of $2,395 sends $2,100 to interest and only $295 to principal. By year 15, that split has reversed somewhat: roughly $1,700 interest and $695 principal. By year 29, you're paying mostly principal. This is why extra payments early in the loan are so powerful — every dollar reduces the principal on which all future interest is calculated.
LTV (loan-to-value ratio) is your loan balance divided by the home's appraised value. At 80% LTV you typically avoid PMI. At 95% LTV, expect PMI plus a slightly higher rate. APR versus interest rate: the interest rate is what you pay on the borrowed money; APR is the broader annual cost including origination fees and points. When comparing lenders, always compare APRs. A 6.9% rate with $4,000 in fees may cost more than a 7.0% rate with $500 in fees, depending on how long you keep the loan.
How Interest Rate Changes Your 30-Year Cost
| Rate | Monthly P&I ($360k loan) | Total Interest Paid | Extra vs. 6% |
|---|---|---|---|
| 6.0% | $2,158 | $417,080 | — |
| 6.5% | $2,275 | $459,000 | +$42k |
| 7.0% | $2,395 | $502,200 | +$85k |
| 7.5% | $2,517 | $546,120 | +$129k |
| 8.0% | $2,642 | $591,120 | +$174k |
Tips to Lower Your Mortgage Payment — and Common Mistakes
The most reliable way to shrink your monthly mortgage payment is to increase your down payment. Going from 10% to 20% on a $400,000 home drops your loan by $40,000, eliminates PMI (~$150/month), and often earns you a slightly better rate — saving roughly $350/month in total. If you can't hit 20%, aim for 10% to at least keep PMI reasonable.
The most common mistake first-time buyers make is shopping for a monthly payment rather than a total loan cost. A 7-year term feels affordable at $389/month for a $25,000 car, but you pay $7,700 in interest and risk being underwater for years. The same logic applies to mortgages: a 30-year term costs about $174,000 more in interest than a 15-year term on a $360,000 loan. Run both scenarios in the calculator before deciding. A second common mistake: forgetting to factor in property taxes and insurance. Buyers budgeting for $2,000/month in P&I are often shocked when the lender's escrow analysis shows $2,800 total PITI.
Frequently Asked Questions About Mortgage Calculators
What is included in a mortgage payment?
A full mortgage payment includes principal (loan repayment), interest (lender's cost), property taxes (escrowed and paid to your county), and homeowner's insurance. If your down payment is below 20%, private mortgage insurance (PMI) is also included. Some loans add HOA dues or flood insurance.
How much house can I afford with a $3,000/month budget?
At 7.0% over 30 years, a $3,000/month budget for PITI (principal, interest, taxes, insurance) supports roughly a $320,000–$350,000 home price with 10% down, assuming about $500/month in taxes and insurance. Use the calculator above with your actual tax and insurance estimates for a precise figure.
Does a 15-year mortgage save money?
Yes — substantially. On a $360,000 loan, a 15-year mortgage at 6.5% costs about $3,137/month but saves over $200,000 in interest compared to a 30-year loan. The payment is 40% higher, but you own the home outright in half the time.
When does PMI go away?
PMI automatically cancels when your loan balance reaches 78% of the original home value (per the Homeowners Protection Act). You can request removal at 80% LTV. If your home has appreciated, order a new appraisal — if the current value supports 80% LTV based on today's price, your lender may cancel PMI early.
What credit score do I need for the best mortgage rate?
Lenders typically reserve their lowest rates for borrowers with credit scores of 760 or higher. Dropping from 760 to 700 can cost you 0.25%–0.75% in rate, adding $50–$150 to a monthly mortgage payment on a $400,000 home. Pull your credit report and resolve any errors before applying.
Should I choose a fixed or adjustable-rate mortgage?
A 30-year fixed gives certainty — same payment for the life of the loan, which makes long-term budgeting predictable. An ARM (adjustable-rate mortgage) starts lower but resets periodically. A 5/1 ARM might open at 6.0% versus 7.0% fixed, saving $230/month — but if rates rise, your payment rises too. ARMs suit buyers who plan to sell within 5–7 years.
How much does a 1% rate difference cost over 30 years?
On a $360,000 loan, moving from 7% to 8% raises your monthly payment by $247 and costs an additional $88,920 over 30 years. That single percentage point costs more than many car purchases. Shopping just two or three lenders for a better rate is often the highest-ROI financial task you can do.
What is an amortization schedule?
An amortization schedule is a table showing every monthly payment split between principal and interest over the loan term. Early payments are mostly interest — month 1 on a $360,000 loan at 7% sends $2,100 to interest and only $295 to principal. By month 300, those numbers nearly reverse. The schedule reveals exactly when you hit 20% equity and when PMI should drop off.
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