Calculate monthly payments, total interest, and find out if you can afford your dream home. Compare buying vs renting and model extra payments to pay off faster.
Monthly Mortgage Payment (P&I)
Interest multiplier
You will pay 154159.51182022336 in interest — 55% on top of your 280000 loan. Over 25 years the bank earns significantly from your mortgage.
25-year total cost
Your home's true cost is 561659.5118202234 — that's 211659.51182022342 more than the purchase price once interest and fees are included.
Power of extra payments
Try adding even €100–€200 extra per month. On a 280000 loan at 3.8%, it could save tens of thousands in interest.
Down payment impact
Your 20% down payment avoids PMI and reduces total interest significantly. Well positioned.
A mortgage is one piece of the puzzle — pair it with these tools to understand the full financial picture.
A mortgage is a secured loan used to finance the purchase of real property — a home, land, or commercial building. The property itself serves as collateral, meaning the lender holds a lien on the property until the debt is fully repaid. Unlike unsecured debt such as credit cards or personal loans, the lender can foreclose — seize and sell the property — if the borrower defaults. This security for the lender is what makes mortgage rates far lower than unsecured lending rates.
The concept of mortgage financing is ancient, but the modern residential mortgage has more structured roots. The Building Societies Act of 1836 in the United Kingdom formalized cooperative lending institutions whose members pooled savings to fund home purchases — an early form of what would become mortgage banking. In the United States, the mortgage market was largely ad hoc and regional until the Great Depression triggered mass foreclosures and devastated the housing market.
The Federal Housing Administration (FHA), established in 1934, standardized the 30-year fixed-rate mortgage as a product accessible to ordinary Americans. Before the FHA, mortgages typically had terms of 3–5 years, required 50% down payments, and carried balloon payments at the end. The FHA-insured 30-year mortgage — with its long amortization, low down payment, and fixed rate — transformed homeownership from a privilege of the wealthy into a broadly accessible financial product. By the 1950s, the 30-year fixed-rate mortgage became the cornerstone of the American middle class.
Today, mortgage lending in the U.S. is a multi-trillion dollar market. The lien placed on your property means the lender has a legal claim that appears in public records and must be satisfied — paid off or released — before you can sell or transfer the property. Understanding how mortgages are structured, priced, and amortized is one of the most consequential pieces of financial knowledge any homebuyer can possess.
Our mortgage calculator takes your key inputs and instantly computes your monthly payment, total cost of borrowing, and a complete amortization schedule showing how each payment is split between principal and interest over the life of the loan.
Inputs:
Outputs:
Six inputs determine every number in a mortgage calculation. Understanding how each one moves your payment and total cost is essential for comparing loan offers and making smart financing decisions.
Principal (P)
The loan amount — home price minus your down payment. A larger down payment directly reduces the principal and therefore every interest charge for the life of the loan. On a $400,000 home, a 10% down ($40,000) vs. 20% down ($80,000) difference creates a $40,000 higher principal that accrues interest for 30 years.
Interest Rate (r)
The annual rate charged by the lender, divided by 12 for monthly calculations. Each 0.5% rate difference on a $300,000 loan changes monthly P&I by about $90 and total interest by about $30,000 over 30 years. This is why rate shopping across 3–5 lenders is among the highest-ROI actions a homebuyer can take.
Loan Term (n)
The repayment period in years, typically 15 or 30. A 15-year term doubles your monthly principal reduction speed and typically carries a rate 0.5–0.75% lower than the 30-year. The trade-off: monthly payments are about 40% higher, but total interest paid is roughly 55% less.
Down Payment
The percentage of the purchase price you pay upfront. Below 20%, most conventional loans require PMI. At exactly 20% ($80,000 on a $400,000 home), you eliminate PMI, reduce principal, and qualify for better rates. The break-even on saving more for a 20% down payment vs. buying sooner with PMI typically ranges 3–7 years.
Property Taxes
Annual tax assessed by your local government, typically 0.5%–2.5% of assessed value depending on location. Property taxes are collected through your escrow account and can increase annually as assessments change, causing your total monthly payment to grow even when your P&I is fixed.
PMI Rate
Private Mortgage Insurance, required on conventional loans with less than 20% down. Typically 0.5%–1.5% of the loan balance annually. On a $320,000 loan, PMI can add $133–$400/month. PMI can be canceled once equity reaches 20% of the original purchase price — request cancellation proactively.
The standard mortgage payment formula is the fixed-payment amortization equation:
Worked Example: You purchase a home for $400,000 with a 20% down payment ($80,000), leaving a loan amount of $320,000 at 6.5% annual interest for 30 years.
This means that over the life of the loan, you pay $408,280 in interest — more than the original home price itself. This stark figure underscores why the interest rate, loan term, and any extra payments you make are so financially significant.
Same $320,000 loan. Compare 30-year at 6.5% vs. 15-year at 5.85%:
The 15-year option costs $657 more per month but saves $245,880 in total interest over the loan life. That $657/month extra buys you $245,880 in guaranteed savings — a return no investment vehicle can match on a risk-adjusted, guaranteed basis. The question is whether cash flow allows the higher payment without straining your budget.
| Rate | Monthly P&I | Total Interest (30yr) | vs. 6.0% Rate |
|---|---|---|---|
| 6.0% | $1,919 | $290,840 | — |
| 6.5% | $2,023 | $329,280 | +$38,440 |
| 7.0% | $2,129 | $366,440 | +$75,600 |
| 7.5% | $2,237 | $405,320 | +$114,480 |
Table assumes $320,000 loan, 30-year term. Total interest figures are illustrative.
For most Americans, a mortgage is the single largest financial commitment of their lives. The home purchase price gets the attention, but it is the mortgage terms — rate, term, and total interest — that determine the true cost. A $400,000 home can end up costing over $700,000 by the time you own it free and clear on a 30-year mortgage, meaning the interest alone is equivalent to purchasing another home outright.
Rate shopping is profoundly important. A difference of just 1% in interest rate on a $300,000 loan over 30 years equates to roughly $60,000 in additional interest. Contacting three to five lenders and obtaining Loan Estimates — the standardized disclosure document lenders are required to provide — is one of the highest-return financial tasks any homebuyer can undertake.
Knowing your numbers also empowers you to make better decisions about term length, down payment size, extra payments, and when or whether to refinance. A mortgage calculator is your essential tool for turning abstract rate quotes into concrete monthly obligations and total cost projections.
The amortization schedule — the month-by-month breakdown of how each payment splits between interest and principal — reveals a crucial truth about early mortgage payments: they are almost entirely interest. On a $320,000 loan at 6.5%, Month 1's payment of $2,023 sends only $290 toward principal and $1,733 toward interest. After one full year of payments totaling $24,276, your balance has declined by less than $3,600. This slow initial equity build is why homeowners who sell in the first few years often find they have barely covered the closing costs they paid on entry — the home must appreciate significantly for an early sale to generate equity.
Understanding your DTI (debt-to-income ratio) before applying is critical because lenders use it as a primary qualifying criterion. Your front-end DTI is your total housing PITI payment divided by gross monthly income — most conventional lenders want this below 28%. Your back-end DTI includes all monthly debt obligations (car payment, student loans, minimum credit card payments, plus PITI) and should stay below 43% for most loan programs. If your DTI is borderline, even small changes — paying down a credit card balance, eliminating a car payment, or choosing a slightly cheaper property — can tip a declined application into an approval.
Maria is buying a $350,000 home with 10% down ($35,000), giving her a $315,000 loan. She qualifies for a 30-year at 6.5% or a 15-year at 5.85%. On the 30-year, her P&I payment is $1,990/month and total interest is $401,400. On the 15-year, her payment is $2,636/month — $646 more — but total interest is only $159,480, saving her $241,920. If Maria can afford the higher payment, the 15-year saves her nearly a quarter-million dollars. If cash flow is tight, the 30-year preserves flexibility, and she can always make extra payments when income allows.
James bought his home 3 years ago with a 7.25% 30-year mortgage on a $280,000 balance. Rates have dropped, and he can refinance to 6.0%. His current payment is $1,910/month; after refinancing, it drops to $1,679/month — a savings of $231/month. Closing costs for the refinance are $4,500. Break-even: $4,500 divided by $231 = 19.5 months. Since James plans to stay in the home at least 5 years, refinancing makes clear financial sense. He resets to a new 30-year term, so his payoff date extends — a consideration he may offset by making extra payments.
David has a $320,000 mortgage at 6.5% for 30 years with a $2,023/month payment. He decides to pay an extra $200/month, always applied to principal. The additional payment reduces his principal faster, which reduces future interest accruals in a compounding effect. Result: David pays off his mortgage approximately 5 years and 3 months early and saves roughly $72,000 in total interest. The $200/month extra costs him $12,000 over 5 years but saves him $72,000 — a 6:1 return on a guaranteed basis.
Chen wants to buy a $280,000 home but only has $12,000 saved — not enough for a 5% conventional down payment of $14,000. An FHA loan allows 3.5% down ($9,800), leaving him $2,200 for closing costs. His FHA loan of $270,200 at 6.75% for 30 years produces a base P&I of $1,752/month. FHA MIP adds: upfront MIP 1.75% × $270,200 = $4,728 (rolled into the loan) plus annual MIP of ~0.85% ÷ 12 = ~$191/month. Total monthly: $1,752 + $191 = $1,943. When Chen's equity reaches 20% — likely around year 11 at normal appreciation — he can refinance to a conventional loan and drop the MIP, reducing his payment significantly. The FHA path gets him into homeownership years earlier than waiting to save 20% down.
On a $320,000 loan at 6.5%, your monthly payment is $2,023. In Month 1, the interest charge is $320,000 times 0.005417 = $1,733. That means only $290 of your first payment reduces the principal. By Month 12, the interest portion is approximately $1,725 and principal is approximately $298. After a full year of payments ($24,276 paid), your balance has dropped by only about $3,576 — less than 1.1% of the loan. This front-loading of interest is mathematically inherent to the amortization formula and is why early extra payments have such an outsized impact on total interest paid.
Discount points are an upfront fee — 1 point equals 1% of the loan amount — paid to buy down your interest rate. On a $300,000 loan, 1 point costs $3,000. In exchange, most lenders reduce the rate by approximately 0.25%. At 6.5%, 1 point brings you to 6.25%, reducing a 30-year payment from $1,896 to $1,847 — a savings of $49/month. Break-even: $3,000 divided by $49 = approximately 61 months (about 5 years). If you stay in the home longer than 5 years without refinancing, points pay off. If rates drop and you refinance within 3 years, you lose the upfront cost. Points are a bet on your time horizon and rate trajectory.
A 5/1 ARM has a fixed rate for the first 5 years, then adjusts annually based on a benchmark index (commonly the 1-year SOFR rate) plus a margin (typically 2.5%–3%). ARMs typically include three caps: an initial cap (how much the rate can change at first adjustment, often 2%), a periodic cap (how much it can change at each subsequent adjustment, often 2%), and a lifetime cap (maximum change over the loan life, often 5%). On a $300,000 ARM starting at 5.5%, if rates rise by the maximum 2% at the first adjustment, your rate goes to 7.5% and your payment jumps from $1,703 to $2,097 — an increase of $394/month. Always model worst-case scenarios, not just the initial payment, when evaluating an ARM against a fixed-rate alternative.
Borrowers who can choose between a 10% down payment (with PMI) or a 20% down payment (PMI-free) face a concrete financial trade-off. On a $350,000 home: 10% down = $35,000 upfront + ~$160/month PMI; 20% down = $70,000 upfront + $0 PMI. The extra $35,000 saved for the larger down payment eliminates $160/month in PMI and reduces the principal by $35,000, also reducing the base monthly payment by ~$220/month. Total monthly savings: ~$380/month. Return on the extra $35,000 invested in a larger down payment: $380 × 12 = $4,560/year savings, a guaranteed 13% annual return on the additional down payment — far exceeding what most investments offer on a guaranteed, risk-free basis.
Making biweekly mortgage payments — half your monthly payment every two weeks instead of one full payment monthly — results in 26 half-payments per year, equal to 13 full monthly payments instead of 12. The extra payment, applied to principal, provides the same effect as the $200/month extra payment strategy but scales automatically with your loan balance. On a $320,000 mortgage at 6.5%, biweekly payments shorten the loan term by approximately 4 years and 8 months, saving roughly $65,000 in total interest. Some lenders offer biweekly programs for a monthly fee — avoid these and instead simply make one extra principal-only payment per year yourself, which achieves the same result at zero cost.
How is a monthly mortgage payment calculated?
Your monthly mortgage payment is calculated using the amortization formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the principal loan amount, r is your monthly interest rate (annual rate divided by 12), and n is the total number of payments (years × 12). For example, a $320,000 loan at 6.5% for 30 years produces a monthly payment of approximately $2,023. This payment covers both principal reduction and interest accrued that month.
How much house can I afford?
A common rule of thumb is that your total housing costs (mortgage principal, interest, taxes, and insurance — called PITI) should not exceed 28% of your gross monthly income. Additionally, your total debt-to-income ratio (DTI) including all debts should stay below 43%. Most lenders use these thresholds. For example, if you earn $8,000/month, you should aim for a PITI of no more than $2,240. Use a mortgage calculator combined with your local tax and insurance estimates for an accurate affordability figure.
What is PMI and when do I need it?
Private Mortgage Insurance (PMI) is required by most conventional lenders when your down payment is less than 20% of the home purchase price. PMI protects the lender — not you — in case you default. It typically costs 0.5%–1.5% of the loan balance annually, added to your monthly payment. For a $320,000 loan, that can be $133–$400/month. Once you reach 20% equity in your home (either through payments or appreciation), you can request PMI cancellation under the Homeowners Protection Act.
Should I choose a 15-year or 30-year mortgage?
A 15-year mortgage carries a lower interest rate (typically 0.5%–0.75% less than a 30-year) and you pay far less total interest — often less than half. However, your monthly payment is significantly higher. A 30-year mortgage has lower monthly payments, providing flexibility and cash flow, but you pay much more interest over time. On a $320,000 loan at 6.5%, a 30-year costs $408,280 in total interest vs roughly $173,000 for a 15-year. Choose based on your cash flow needs and how long you plan to stay in the home.
What is the difference between an ARM and a fixed-rate mortgage?
A fixed-rate mortgage locks in your interest rate for the entire loan term, giving you predictable payments. An Adjustable-Rate Mortgage (ARM) starts with a fixed rate for an initial period (e.g., 5 years on a 5/1 ARM), then adjusts periodically based on a benchmark index like SOFR. ARMs typically offer lower initial rates but carry risk: after the fixed period ends, your payment can increase significantly. Most ARMs have caps on how much the rate can change per adjustment and over the loan lifetime, but rate risk remains real.
What are mortgage points and should I buy them?
Mortgage points (also called discount points) are upfront fees paid to lower your interest rate. One point equals 1% of the loan amount. Paying one point typically reduces your rate by about 0.25%. On a $300,000 loan, one point costs $3,000 and may save you roughly $49/month. The break-even period is about 61 months. If you plan to stay in the home longer than the break-even, buying points makes sense. If you might move or refinance sooner, keep your cash and skip the points.
What credit score do I need for a mortgage?
Credit score requirements vary by loan type. Conventional loans typically require a minimum 620 score, though scores above 740 get the best rates. FHA loans allow scores as low as 580 with a 3.5% down payment, or even 500 with a 10% down payment. VA and USDA loans have no official minimum but most lenders require at least 620. A higher credit score directly translates to lower mortgage rates — the difference between a 620 and 760 score on a $300,000 loan can mean $100+ per month in savings.
What are closing costs and how much should I expect to pay?
Closing costs are fees paid at the time you finalize your mortgage, typically ranging from 2%–5% of the loan amount. On a $320,000 loan, that is $6,400–$16,000. Common closing costs include origination fees, appraisal, title insurance, title search, attorney fees, recording fees, prepaid interest, homeowners insurance, and property tax escrow. Some lenders offer no-closing-cost mortgages that roll these fees into the rate or loan balance — useful if you are short on cash but more expensive long-term.
What is an escrow account for a mortgage?
An escrow account is a third-party account your lender manages to collect and pay your property taxes and homeowners insurance on your behalf. Each month, a portion of your payment goes into escrow. When your tax or insurance bill comes due, your lender pays it from the escrow account. Escrow accounts are often required when your down payment is less than 20%. They protect both you and the lender by ensuring these critical bills are always paid on time, preventing tax liens or lapses in coverage.
What is mortgage preapproval and why does it matter?
Mortgage preapproval is a formal process where a lender reviews your income, assets, debts, and credit to determine how much you can borrow and at what rate. It results in a conditional commitment letter valid for 60–90 days. Preapproval is more rigorous than prequalification (which is just an estimate based on self-reported data) and gives sellers confidence that you are a serious, qualified buyer. In competitive markets, many sellers will not consider offers without a preapproval letter. It also speeds up closing once your offer is accepted.
| Loan Type | Min Down | Min Credit Score | Mortgage Insurance | Best For |
|---|---|---|---|---|
| Conventional | 3% | 620 (740+ for best rate) | PMI if <20% down; removable | Strong credit, >20% down buyers |
| FHA | 3.5% (580+) / 10% (500–579) | 500 | MIP for life (often) | First-time buyers, lower credit |
| VA | 0% | None officially (620+ typical) | None (funding fee only) | Veterans, active duty, spouses |
| USDA | 0% | 640 typically | Annual guarantee fee | Rural/suburban low-income buyers |
| Jumbo | 10–20% | 700+ | Varies by lender | High-cost area, high-price homes |
| 15-Year Fixed | 3–20% | 620+ | PMI if <20% down | Those prioritizing payoff speed |
Your FICO score is one of the single biggest levers you have over your mortgage rate. On a $350,000 loan, the difference between a 620 and a 760 credit score can easily translate to $200–$350 per month in payment difference and tens of thousands of dollars over the life of the loan.
| FICO Score Range | Typical Rate (30-yr) | Monthly Payment* | Total Interest Paid* | Rating |
|---|---|---|---|---|
| 760–850 | 6.50% | $2,212 | $246,352 | Excellent |
| 700–759 | 6.72% | $2,264 | $265,040 | Good |
| 680–699 | 6.89% | $2,304 | $279,440 | Fair-Good |
| 660–679 | 7.11% | $2,357 | $298,520 | Fair |
| 640–659 | 7.55% | $2,463 | $336,680 | Below Average |
| 620–639 | 8.11% | $2,599 | $385,640 | Poor |
*Based on a $350,000 loan with 20% down ($280,000 financed). Rates are illustrative; actual rates vary by lender, market conditions, and loan type.
Delaying your home purchase by six to twelve months to improve your credit score from 660 to 760+ is often the highest-return financial move available to prospective buyers. Paying down revolving debt below 30% utilization and resolving any collections or late payments are the fastest ways to move the needle on your FICO score.
It is also worth noting that mortgage lenders typically pull all three bureaus — Equifax, Experian, and TransUnion — and use the middle score when evaluating your application. If one bureau has incorrect derogatory marks, disputing them before you apply can make a meaningful difference. Rate shopping within a 45-day window counts as only one hard inquiry under FICO scoring rules, so do not hesitate to obtain quotes from multiple lenders.
Some lenders offer manual underwriting for borrowers with thin credit files — such as recent immigrants or young adults who have avoided debt — where alternative payment history like rent, utilities, and insurance can substitute for a traditional credit score. If you are in this situation, ask lenders specifically about manual underwriting options rather than assuming you do not qualify.
Finally, once you have a mortgage, protecting your credit score matters for more than just future borrowing. A strong score can affect your homeowners insurance premium, your ability to refinance when rates drop, and even background checks for certain professional licenses. Treat your credit score as a long-term financial asset and review your full credit report annually at AnnualCreditReport.com, the only federally authorized free source.
Bottom line: improving your credit score before applying is almost always worth the delay, especially in higher-rate environments where the spread between score tiers widens. Use this mortgage calculator to model the payment impact of different rates, and pair that analysis with a realistic timeline for credit improvement to make an informed decision about when to buy.
Methodology: Payment calculations follow standard fixed-payment amortization per the Consumer Financial Protection Bureau Mortgage Guide. Rate benchmarks reference the Freddie Mac Primary Mortgage Market Survey. Housing finance statistics sourced from HUD Housing Finance Statistics. All examples are illustrative; actual rates and payments vary by lender, credit profile, and market conditions.
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