Estimate how much interest you could pay over the life of your mortgage with this Mortgage Interest Calculator. Enter your loan amount, annual interest rate, and repayment term to calculate your estimated monthly principal-and-interest payment, total interest, and total payments over the full loan term.
How Mortgage Interest Is Calculated
For a typical fixed-rate mortgage with monthly repayments, the monthly payment is calculated using the loan principal, monthly interest rate, and number of monthly payments. Early payments generally cover a larger share of interest, while later payments gradually reduce more of the principal.
Your actual interest cost depends on the rate you receive, the amount borrowed, and how long you take to repay the loan.
What Affects Your Total Interest Cost?
Loan amount: Borrowing more generally increases the total interest paid when the interest rate and loan term remain the same.
Interest rate: Even a small rate difference can significantly affect the total cost of a long-term mortgage. Compare potential payments using our Mortgage Rate Calculator.
Loan term: A longer term usually lowers the required monthly principal-and-interest payment but increases the total interest paid over the life of the loan. A shorter term generally means higher monthly payments but less interest overall.
Compare Mortgage Costs Before You Borrow
Try different rates and repayment terms to understand how they affect your overall borrowing cost. Use our 15-Year Mortgage Calculator and 30-Year Mortgage Calculator to compare common repayment periods.
To see how each payment is divided between principal and interest over time, use our Amortization Calculator.
Important: This calculator assumes a fixed interest rate and equal monthly payments throughout the selected term, with no extra payments or changes to the loan. Results are estimates and may differ from your lender’s figures because of rounding, payment timing, or loan terms. The displayed total mortgage cost represents principal plus interest; it excludes property taxes, homeowners insurance, mortgage insurance, closing costs, and other fees.
Frequently Asked Questions
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About Us
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Disclaimer
MortgageRatesChecker provides educational mortgage calculators, loan tools, and financial guides designed to help you better understand home financing. Our content is researched, fact-checked, and regularly updated in accordance with our Editorial Policy, using trusted information from our Data Sources and transparent methodologies explained in How We Calculate. Learn more about our commitment to accuracy on Why Trust Us. This content is provided for informational purposes only and should not be considered financial, legal, tax, investment, or mortgage advice. Mortgage rates, lending requirements, loan programs, and regulations may change without notice. Before making any borrowing, refinancing, or home-buying decision, consult your Bank or Mortgage Lender, licensed financial advisor, tax professional, or attorney based on your individual circumstances. MortgageRatesChecker is an independent educational resource and is not a lender, mortgage broker, financial advisor, or government agency. Please review our Affiliate Disclosure, Advertiser Disclosure, Disclaimer, and Terms & Conditions for additional information.
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