Mortgage Calculator: Estimate Your Monthly Home Loan Payment
Calculate your monthly mortgage payment, total interest, and full amortization schedule. Includes estimates for property tax, insurance, PMI, and HOA fees.
Include Taxes & Additional Costs
How it works: Your monthly payment goes toward paying down the loan principal and interest. Taxes, insurance, PMI, and HOA fees may be added to your total monthly housing cost.
Amortization Schedule
See how your mortgage balance decreases over time.
| # | Date | Payment | Principal | Interest | Balance |
|---|---|---|---|---|---|
| Calculate to see amortization. | |||||
What Is a Mortgage Calculator?
A mortgage calculator is an online tool that estimates your monthly home loan payment based on the loan amount, interest rate, and loan term. It helps you understand how much a home might cost you each month and over the life of the loan.
💡 Quick Example: A $320,000 loan at 6.761% interest for 30 years has a monthly principal & interest payment of $2,077.85. Add estimated taxes, insurance, and PMI to get your total monthly housing payment.
How to Use the Mortgage Calculator
- Enter the home price – the total purchase price of the property.
- Enter your down payment – either as a dollar amount or a percentage.
- Set the loan term – typically 15, 20, or 30 years.
- Enter the interest rate – your expected annual mortgage rate.
- Add optional costs – property tax, insurance, PMI, and HOA fees.
- Click "Calculate" to see your estimated monthly payment and amortization schedule.
How Mortgage Payments Are Calculated
The monthly principal and interest payment is calculated using the standard mortgage formula:
- M = Monthly principal & interest payment
- P = Loan amount (principal)
- r = Monthly interest rate (annual rate ÷ 12)
- n = Total number of months (loan term × 12)
The total monthly payment is the sum of P&I plus estimated property tax, homeowners insurance, PMI, and HOA fees (if provided).
Principal and Interest Explained
Principal is the amount you borrow to buy the home. Interest is the cost of borrowing that money. In the early years of a mortgage, most of your payment goes toward interest. As you pay down the principal, more of your payment goes toward the principal balance.
Property Taxes and Homeowners Insurance
Lenders typically require you to pay property taxes and homeowners insurance as part of your monthly mortgage payment. These funds are held in an escrow account and paid on your behalf when they come due.
- Property tax – varies by location, typically 0.5–1.5% of the home's value annually.
- Homeowners insurance – protects your home and belongings; costs vary based on coverage and location.
What Is PMI?
Private Mortgage Insurance (PMI) is required by most lenders when your down payment is less than 20% of the home price. It protects the lender if you default on the loan. PMI costs vary but typically range from 0.3% to 1.5% of the loan amount annually. Once you reach 20% equity, you can usually request to cancel PMI.
How Down Payment Affects Your Mortgage
A larger down payment:
- Reduces your loan amount, lowering your monthly payment
- Reduces total interest paid over the life of the loan
- May help you avoid PMI (20%+ down payment)
- Can help you qualify for better interest rates
How Interest Rates Affect Monthly Payments
Even a small difference in interest rates can significantly impact your monthly payment and total interest. For example, on a $300,000 loan:
- At 6.0%: $1,799/month, total interest $347,514
- At 7.0%: $1,996/month, total interest $418,527
A 1% rate increase adds nearly $200 to the monthly payment and over $71,000 in extra interest over 30 years.
How Loan Term Affects Total Interest
Shorter loan terms have higher monthly payments but much lower total interest.
- 30-year loan: Lower monthly payment, higher total interest
- 15-year loan: Higher monthly payment, much lower total interest (often 50%+ less)
Real-World Mortgage Example
Scenario: You're buying a home for $400,000 with a 20% down payment ($80,000). You get a 30-year fixed mortgage at 6.761%. Annual property taxes are 1.2% ($4,800), insurance is $1,500/year.
- Loan Amount: $320,000
- Monthly Principal & Interest: $2,077.85
- Monthly Property Tax: $400.00
- Monthly Insurance: $125.00
- Estimated Total Monthly Payment: $2,602.85
- Total Interest Paid: $428,027.54
- Total Mortgage Cost: $748,027.54
This example shows how taxes and insurance add to the base principal and interest payment.
Common Mortgage Calculation Mistakes
- Forgetting taxes and insurance: Your total payment is more than just principal and interest.
- Using the wrong interest rate: Rates are annual; the formula uses monthly rates.
- Ignoring PMI: If your down payment is less than 20%, PMI adds to your monthly cost.
- Overestimating affordability: Don't forget to budget for utilities, maintenance, and other homeownership costs.
Tips to Reduce Mortgage Interest
- Make a larger down payment – reduces the loan amount and may eliminate PMI.
- Shop for the best rate – even 0.25% can save thousands over the loan.
- Consider a shorter loan term – 15-year loans have much lower total interest.
- Make extra principal payments – paying even a little extra each month reduces interest and shortens the loan.
- Refinance when rates drop – if rates fall significantly, refinancing can lower your payment and interest.
Important Assumptions and Limitations
- The calculator uses the standard mortgage formula and is accurate for estimation purposes.
- Tax, insurance, PMI, and HOA fees are estimates; actual costs vary.
- The calculator assumes fixed-rate mortgages and does not handle ARMs or interest-only loans.
- Closing costs, points, and lender fees are not included.
- Rates and terms are subject to lender approval and market conditions.
Frequently Asked Questions
What is included in a monthly mortgage payment? ▼
A monthly mortgage payment typically includes principal, interest, property taxes, and homeowners insurance (PITI). PMI and HOA fees may also be included if applicable. This calculator shows both the base P&I payment and the estimated total with optional costs.
How is the mortgage payment formula calculated? ▼
The monthly payment is calculated using the formula M = P × r × (1 + r)ⁿ / ((1 + r)ⁿ − 1). P is the loan amount, r is the monthly interest rate (annual rate / 12), and n is the total number of monthly payments (loan term × 12).
What is a good down payment amount? ▼
A down payment of 20% or more helps you avoid PMI and may get you a better interest rate. However, many borrowers put down 5–10%, especially first-time homebuyers. FHA loans allow as little as 3.5% down.
What is PMI and how can I avoid it? ▼
Private Mortgage Insurance (PMI) is required by lenders when your down payment is less than 20% of the home price. It protects the lender if you default. You can avoid PMI by making a 20% down payment or by using a loan program that doesn't require it (such as VA or USDA loans).
What is the difference between a 15-year and 30-year mortgage? ▼
A 30-year mortgage has lower monthly payments but you pay much more in total interest over the life of the loan. A 15-year mortgage has higher monthly payments but you build equity faster and save significantly on interest. For example, on a $300,000 loan at 6.5%, you'd save about $200,000 in interest with a 15-year term.
Does this calculator include property taxes and insurance? ▼
Yes, you can enter annual property tax and homeowners insurance amounts. The calculator will add the monthly portions to your estimated total monthly payment. These are optional fields, so you can see both the base P&I payment and the full estimated cost.
How accurate is this mortgage calculator? ▼
This calculator uses the exact mathematical formula used by banks and lenders, so the principal and interest calculation is highly accurate. However, actual mortgage payments may vary based on lender fees, points, changes in tax rates, and insurance costs. Always consult with a mortgage professional for precise figures.