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360 months = 30 years · P&I only—add taxes/insurance in your budget
Use this free mortgage calculator to estimate your monthly payment, total interest, and full loan cost. No signup required.
Last updated: March 2026
Monthly Payment
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Total Interest
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Total Payment
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30-year shortcut: dedicated 30-year calculator. More: home, car, personal, interest.
P&I only—no taxes, insurance, or PMI. Home · Car
Jump to the calculator you need—mortgage, car, personal, or by amount:
Average 30-year fixed rates: about 6.5%–7.5% (credit and market dependent).
Down payment: 20% avoids PMI. First-timers often put 3%–10%. FHA allows 3.5%.
This tool shows principal and interest only—add taxes, insurance, and PMI to your budget. Use our down payment calculator to model different scenarios.
Simple: Fixed monthly payments over 15, 20, or 30 years. Each payment = interest + principal.
Early on, most goes to interest. Near the end, mostly principal. Three inputs drive the number: loan amount, rate, and term. Try our $200k, $300k, $400k, or 30-year calculators.
A $300,000 mortgage at 6.5% for 30 years (360 months) gives a monthly payment of about $1,896. Over 30 years you’d pay roughly $682,600 in total—$382,600 in interest. With a 15-year term at the same rate, the payment rises to about $2,613, but total interest drops to around $170,300. Use the calculator above to compare your own scenarios.
A $450,000 mortgage at 7% for 30 years ≈ $2,994/month and about $627,500 in total interest. A $350,000 loan at 6.75% for 30 years ≈ $2,270/month. Use our mortgage for $300k, mortgage for $400k, or mortgage for $500k for pre-filled amounts.
How loan term affects monthly payment and total interest:
| Term | Monthly Payment | Total Interest |
|---|---|---|
| 15 years | $2,613 | $170,300 |
| 20 years | $2,238 | $237,200 |
| 30 years | $1,896 | $382,600 |
See 15-Year Mortgage and 30-Year Mortgage for dedicated calculators.
A mortgage calculator helps you estimate your monthly payment and total interest before you talk to a lender. Whether you are a first-time buyer or refinancing, knowing the numbers upfront lets you set a realistic budget and compare loan options.
Enter the loan amount (sale price minus down payment), annual rate, and term in months. The calculator shows principal and interest only—property tax, insurance, and PMI are separate. For a $250,000 mortgage at 6.5% for 30 years, expect about $1,580 per month in principal and interest. Add your local taxes and insurance to get a full picture of your housing cost.
Shorter terms mean higher monthly payments but far less interest over the life of the loan. A $300,000 mortgage at 6.5% costs about $382,600 in interest over 30 years. The same loan over 15 years costs only $170,300 in interest—a savings of over $212,000—but the monthly payment rises from $1,896 to $2,613. Use this mortgage calculator to see how term length affects both your payment and total cost.
Even small rate changes matter on a large mortgage. A quarter-point drop on a $400,000 loan can save tens of thousands in interest over 30 years. Try different rates to see how market shifts or credit improvements might affect your payment. Compare with our 15-year mortgage or 30-year mortgage calculators for dedicated tools.
Try a few rate and term combinations—even a quarter-point on a large balance matters over decades. If your loan wraps fees into the balance, add them to the amount field. Compare with our car loan calculator, personal loan calculator, business loan calculator, or simple interest calculator.