Mortgage Calculator (2026)
Calculate your monthly principal & interest payment, total interest paid, and full amortization schedule for any US home loan.
Understanding Your Total Monthly Mortgage Payment (PITI)
When you take out a home loan, your monthly housing payment is rarely just principal and interest. In the United States, lenders bundle multiple expenses into a single monthly escrow payment commonly known by the acronym PITI: Principal, Interest, Taxes, and Insurance.
| PITI Component | Where the Money Goes | Typical Monthly Cost |
|---|---|---|
| Principal | Directly repays the borrowed loan balance, building home equity. | Starts lower, increases each month as balance drops. |
| Interest | The fee paid to the lender for borrowing the principal. | Starts highest, decreases steadily over the loan term. |
| Property Taxes | County/city tax held in escrow to fund public schools, roads, and emergency services. | $150 – $600/month (varies from 0.3% in HI to 2.2% in NJ). |
| Homeowners Insurance | Protects against fire, storms, liability, and hazard damages. | $80 – $250/month (higher in coastal/storm-prone states). |
| PMI / MIP (if applicable) | Required on conventional loans with under 20% down or FHA loans. | $100 – $300/month (until 20% home equity is attained). |
15-Year Fixed vs. 30-Year Fixed Mortgage Comparison
Choosing between a 15-year and a 30-year fixed loan is one of the most critical decisions for any homebuyer. On a $300,000 mortgage at current 2026 market rates:
- 30-Year Fixed (at 6.85%): Monthly Principal & Interest is approximately $1,966. Total lifetime interest paid is $407,760. Total loan payout equals $707,760.
- 15-Year Fixed (at 6.15%): Monthly Principal & Interest is approximately $2,558 ($592 higher per month). Total lifetime interest paid is $160,440. Total loan payout equals $460,440.
- The Net Difference: The 15-year mortgage saves you $247,320 in pure interest and cuts 15 full years off your debt obligations.
How Lenders Qualify You: The 28/36 Debt-to-Income (DTI) Rule
To determine the maximum mortgage you can afford, mortgage underwriters evaluate your Debt-to-Income (DTI) ratio using two standard benchmarks:
1. Front-End DTI (Housing Ratio): Your total monthly housing expenses (PITI + HOA fees) should generally not exceed 28% of your gross pre-tax monthly income.
2. Back-End DTI (Total Debt Ratio): Your total monthly debt obligations (PITI plus auto loans, student loans, minimum credit card payments, and child support) should not exceed 36% of your gross monthly income (or up to 43% to 50% for select FHA and Fannie Mae automated approvals).
PMI: What It Is, What It Costs, and When It Drops
Private Mortgage Insurance (PMI) is one of the most misunderstood costs in US homebuying. It protects the lender (not you) against default risk when you put down less than 20% of the purchase price. It adds real cost to your monthly payment — typically 0.5% to 1.5% of the loan amount per year, or $100 to $375 per month on a $300,000 loan.
The good news: PMI is not permanent on conventional loans. The Homeowners Protection Act (HPA) gives you two automatic rights:
- Automatic cancellation at 78% LTV — your lender must cancel PMI when your loan balance drops to 78% of the original purchase price, based on scheduled amortization.
- Requested cancellation at 80% LTV — once you reach 80% LTV (either via payments, extra payments, or home appreciation), you can formally request PMI removal. The lender may require a new appraisal to confirm current value.
FHA loans work differently: if your down payment was under 10%, Mortgage Insurance Premium (MIP) stays for the entire loan life — the only escape is refinancing into a conventional loan once you have 20% equity.
Strategy tip: In markets where home values have risen sharply since purchase, it often makes sense to order a new appraisal proactively. If the appraisal confirms you now have 20%+ equity based on current market value (not original purchase price), many lenders will remove PMI immediately, saving hundreds per month.
Fixed-Rate vs. Adjustable-Rate Mortgage (ARM) — Comparison
After locking in a fixed rate, your principal and interest payment never changes. An ARM starts lower but can increase significantly after the initial fixed period. Here is how the two loan types compare on a $350,000 loan in 2026:
| Feature | 30-Year Fixed | 7/1 ARM | 15-Year Fixed |
|---|---|---|---|
| Starting Rate | ~7.00% | ~6.25% (fixed 7 yrs) | ~6.35% |
| Starting P+I Payment | ~$2,329/mo | ~$2,155/mo | ~$3,021/mo |
| Rate Stability | Fixed for 30 years | Fixed 7 yrs, then annual adjustments | Fixed for 15 years |
| Total Interest (full term) | ~$488,000 | Unpredictable after Year 7 | ~$194,000 |
| Best For | Long-term homeowners, rate certainty | Those planning to sell/refinance within 7 years | Accelerated payoff, lower total interest |
An ARM makes strategic sense only if you have a clear exit plan before the fixed period ends. If you plan to stay in the home long-term, the rate certainty of a fixed mortgage is almost always worth the slightly higher initial rate.
5 Ways to Pay Off Your Mortgage Faster
Every dollar of extra principal you pay reduces your remaining balance — and because future interest accrues on that balance, early extra payments have a multiplier effect on interest saved. Here are five proven strategies:
- Make one extra principal-only payment per year. Applied directly to principal (not into your escrow account), a single annual extra payment on a 30-year mortgage shaves 4–5 years off the payoff date and saves tens of thousands in interest.
- Round up your monthly payment. If your payment is $1,863, rounding up to $2,000 sends an extra $137 to principal each month — adding up to $1,644 per year in accelerated paydown.
- Switch to bi-weekly payments. By splitting your monthly payment in half and paying every two weeks, you make 26 half-payments instead of 24 (12 months × 2). This equates to one full extra payment per year on autopilot.
- Apply all windfalls to principal. Tax refunds (average US refund: ~$3,100), bonuses, or inheritances applied to principal in lump sums dramatically accelerate payoff timelines.
- Refinance to a shorter term. If rates drop 1%+ below your current rate, refinancing from a 30-year to a 15-year term restructures your loan to build equity twice as fast, though the monthly payment increases.
Worked Example: $425,000 Home Purchase in 2026
Let's walk through a complete PITI calculation for a realistic US homebuyer scenario.
Scenario: A couple in suburban Dallas, TX purchases a $425,000 home. They put 10% down ($42,500) and take a 30-year fixed mortgage at 7.00% interest. Annual property tax is $6,800 (1.6% effective rate). Annual homeowners insurance is $2,400. PMI applies at 0.85% of the loan amount annually.
- Loan Amount: $425,000 − $42,500 = $382,500
- Monthly Rate (r): 7.00% ÷ 12 = 0.5833%
- P+I Payment: $382,500 × [0.005833 × (1.005833)^360] ÷ [(1.005833)^360 − 1] = $2,545/month
- Monthly Property Tax: $6,800 ÷ 12 = $567/month
- Monthly Insurance: $2,400 ÷ 12 = $200/month
- Monthly PMI: ($382,500 × 0.0085) ÷ 12 = $271/month
- Total PITI: $2,545 + $567 + $200 + $271 = $3,583/month
To qualify under the 28% front-end DTI rule, this couple would need a gross monthly income of at least $12,796/month ($153,552/year). PMI can be cancelled once the loan balance drops to $340,000 (80% of $425,000 purchase price) — approximately at month 94 (Year 8) on a standard amortization schedule.
3 Tips to Get a Lower Mortgage Rate
- Improve your credit score before applying. Moving from a 680 to a 740 FICO score can reduce your 30-year mortgage rate by 0.375–0.625%, which on a $350,000 loan saves over $56,000 in lifetime interest. Pay down revolving balances to under 30% utilization 3–6 months before applying.
- Shop at least 3–5 lenders. Freddie Mac research found that borrowers who obtain 5 mortgage quotes save an average of $3,000 over the life of the loan versus those who accept the first offer. Rate shopping within a 45-day window counts as only a single credit inquiry.
- Consider buying mortgage points. One discount point costs 1% of the loan amount (e.g., $3,500 on a $350,000 loan) and typically reduces your rate by 0.25%. Calculate your break-even date (cost ÷ monthly savings) — if you plan to stay longer than that, buying points makes financial sense.
Frequently Asked Questions
Monthly principal and interest (P&I) uses standard amortization: M = P × [r(1+r)^n] / [(1+r)^n − 1] where P is the loan amount, r is the monthly interest rate, and n is the total number of payments.
Your full PITI payment also includes monthly property tax (annual / 12), homeowners insurance (annual / 12), and PMI if your down payment is under 20% of the purchase price.
2026 Average Mortgage Rates (30-Year Fixed)
- Excellent credit (760+): 6.5%–7.0%
- Good credit (700–759): 6.75%–7.25%
- Fair credit (640–699): 7.25%–8.0%
- 15-year fixed typically runs 0.5%–0.75% below 30-year