Mortgage Calculator With Extra Payments: Save Interest Fast

Estimate how much interest you could save by making extra monthly mortgage payments. Enter your home price, down payment, interest rate, mortgage term, and additional monthly payment to compare your regular repayment with an overpayment strategy. The calculator estimates your revised monthly payment, potential interest savings, and how much sooner you could pay off your mortgage.

Enter your home price and down payment to calculate the initial mortgage amount. Add your expected annual interest rate, loan term in years, and the extra amount you plan to pay each month. Select Calculate Savings to see your estimated payment including the overpayment, projected payoff time, and potential interest savings.

Try different extra payment amounts to see how even modest overpayments may affect your repayment timeline.

Mortgage interest is generally calculated using your outstanding loan balance. When an extra payment reduces your principal, less debt remains on which future interest can accrue. Over time, this may reduce your total interest cost and shorten the repayment period.

For example, if your required monthly payment is $2,000 and you pay an additional $200 each month, your total monthly payment becomes $2,200. The actual savings depend on your interest rate, remaining balance, repayment term, and when the extra payments are made.

• New monthly payment: Your estimated regular mortgage payment plus the extra monthly amount entered.
• Loan payoff time: The estimated time needed to repay the mortgage when the additional payments continue.
• Time saved: The estimated reduction in repayment time compared with the original mortgage term.
• Interest saved: The estimated difference between interest under the regular repayment schedule and interest under the overpayment strategy.

These figures help you compare repayment strategies, but the results depend on the assumptions used by the calculator.

Extra payments may be useful if you want to reduce mortgage interest and become debt-free sooner. However, consider your wider finances before committing extra money to your mortgage. Maintaining emergency savings and managing higher-interest debts may be more important than making additional mortgage payments.

Check your mortgage agreement for annual overpayment limits, early repayment charges, and other restrictions. Some lenders allow a set amount of overpayment without a penalty, while others may charge fees if you exceed their limits.

You can also use our Mortgage Calculator to estimate your standard monthly payment or our Mortgage Payoff Calculator to explore your repayment timeline.

Important: This calculator provides estimates for planning purposes, not personalised financial advice. It assumes a fixed interest rate and the same extra payment every month until the loan is repaid. Actual savings may differ because of lender calculations, rate changes, fees, and overpayment restrictions. The displayed amounts are in US dollars; use consistent currency values for all inputs.