Method
The estimate compares a standard repayment schedule with one that adds a fixed monthly overpayment.
Finance / browser tool
Mortgage Overpayment Calculator
Enter any monthly overpayment to see the interest saved and time off your term.
Your inputs stay on your device
Estimate overpayment savings
live resultUSD
%
years
USD
Standard payment
Without overpayment
New monthly payment
Including $200.00 extra
Interest saved
Compared to no overpayment
Time saved
New term: 23y 7m
Results are based on a standard fixed-rate amortisation formula. They do not account for variable rates, fees, or lender restrictions. Currency selection labels amounts only and does not use exchange rates.
Useful context
How it works
Use the calculator first, then scan the details below when you want more context about the inputs, result, or assumptions.
How to use it
Enter the mortgage principal, rate, term, and extra monthly amount, then compare time and interest saved.
Understand the result
Interest saved and months shortened describe the difference between the two modeled schedules.
Example
An extra $100 each month can shorten a long mortgage and reduce modeled interest.
Notes
Actual lender rules, overpayment caps, fees, and variable rates can change the outcome; this is not financial advice.
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