Mortgage Calculator
Calculate monthly payments, total interest cost, amortization schedule, and home affordability
Mortgage Calculator
Calculate monthly payments, total interest, and create amortization schedules
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Mortgage Loan Types Compared
| Loan Type | Pros | Cons | Best For |
|---|---|---|---|
| 30-Year Fixed | Lowest monthly payment, predictable | More interest paid overall | Long-term homeowners, tight budgets |
| 15-Year Fixed | Lower rate, build equity faster | Higher monthly payment | Those who can afford higher payments |
| 5/1 ARM | Lowest initial rate | Rate adjusts after 5 years (risk) | Selling/refinancing within 5 years |
| 7/1 ARM | Low initial rate, 7 yr stability | Uncertainty after initial period | Medium-term homeowners |
| FHA Loan | 3.5% down, easier qualification | Mortgage insurance (MIP) required | First-time buyers with lower credit |
| VA Loan | 0% down, no PMI, competitive rates | Military/veteran eligibility required | Veterans and active duty service members |
| USDA Loan | 0% down in rural areas | Geographic and income restrictions | Rural area home buyers |
The 28/36 Affordability Rule
Lenders and financial advisors use the 28/36 rule to assess affordability: Front-end ratio (housing costs gross income) 28%; Back-end ratio (all debt payments gross income) 36%. For a $90,000 household income ($7,500/mo gross): max housing payment = $2,100; max total debt = $2,700. Staying well below these limits provides a financial safety buffer for unexpected expenses.
PMI and How to Eliminate It
Private Mortgage Insurance (PMI) is required on conventional loans with less than 20% down. It typically costs 0.51.5% of the loan amount annually. On a $300,000 loan, that is $1,500$4,500/year ($125$375/month). Under federal law (Homeowners Protection Act), you can request PMI cancellation when your equity reaches 20%, and lenders must automatically cancel at 22% equity based on the original amortization schedule.
Frequently Asked Questions
What is the mortgage formula and how is monthly payment calculated?
The standard mortgage payment formula is: M = P[r(1+r)^n] / [(1+r)^n - 1], where M = monthly payment, P = principal loan amount, r = monthly interest rate (annual rate 12), n = number of payments (loan term in years 12). For example: $300,000 loan at 7% for 30 years r = 0.07/12 = 0.00583, n = 360: M = 300,000 [0.00583 (1.00583)^360] / [(1.00583)^360 - 1] = $1,995.91/month (principal + interest only).
What does PITI mean in mortgage calculations?
PITI stands for Principal, Interest, Taxes, and Insurance the four components of a complete monthly mortgage payment. P&I (principal + interest) is calculated from the loan formula. Property taxes are typically 12% of home value per year, divided by 12. Homeowners insurance averages $100$200/month. If your down payment is less than 20%, PMI (Private Mortgage Insurance) adds $50$250/month. Always calculate the total PITI payment, not just P&I, when assessing affordability.
How much house can I afford?
The standard guideline is the 28/36 rule: (1) Housing costs (PITI) should not exceed 28% of gross monthly income; (2) Total debt payments (PITI + car, student, credit card loans) should not exceed 36%. For a $100,000 annual income: 28% = $2,333/month max housing; 36% = $3,000/month max total debt. Lenders calculate your Debt-to-Income (DTI) ratio; most conventional loans require DTI 43%, though 36% is ideal.
What is amortization and how does it work?
Amortization is the process of paying off a loan through scheduled payments. In early years, most of your payment goes toward interest; over time, more goes toward principal. On a $300,000, 30-year, 7% mortgage: payment 1 is ~$1,750 interest / $246 principal; by year 15, it shifts to ~$1,350 interest / $646 principal; by year 25, it is ~$700 interest / $1,296 principal. This is why refinancing in the first 10 years loses the most "equity" you have built very little principal paydown yet.
How does a larger down payment affect my mortgage?
A larger down payment: (1) Reduces your loan principal directly; (2) Eliminates PMI at 20% down (saving $50$250/month); (3) May qualify you for a lower interest rate; (4) Increases your home equity cushion against market declines. Trade-off: that cash is illiquid in your home. With today's mortgage rates, many financial advisors recommend investing extra cash in a diversified portfolio if your expected investment returns exceed your mortgage rate. Compare carefully with your specific rate and mortgage options.
When should I consider refinancing my mortgage?
Refinancing makes financial sense when: (1) You can get a rate at least 0.51% lower than your current rate; (2) You plan to stay in the home long enough to recoup closing costs (typically $3,000$6,000). The breakeven point = closing costs monthly savings. Example: $5,000 closing costs, $150/month savings = 33 months to break even. Also consider refinancing to remove PMI (if you now have 20% equity), shorten the loan term, or switch from ARM to fixed.
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