See what overpaying your mortgage could actually save you
Overpaying reduces what you owe, and because interest is charged on your outstanding balance, a smaller balance means less interest over the life of the loan. This calculator uses your own balance, rate and remaining term to show what a regular or one-off overpayment could do to your payoff date and total interest, so you can decide whether it's worth doing before you call your lender.
Understanding the Mortgage Overpayment Calculator
This guide explains what the Mortgage Overpayment Calculator works out and how to read the result once you have it. It's for anyone with a mortgage who is wondering whether paying extra off the balance is worth doing, before checking the details with their lender. Paying extra off a loan saves you interest, because interest is charged on what you still owe, and this calculator shows roughly how much that could mean for you.
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Gather your mortgage details
Find your outstanding balance, interest rate and remaining term on your most recent mortgage statement.
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Enter your figures
Add a regular or one-off overpayment amount to see how it changes your outstanding balance over time.
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Read what the numbers mean
See how much interest and time an overpayment could save, and understand what the result depends on before you act on it.
See what overpaying could do to your mortgage
Paying extra off your balance each month reduces the interest you're charged, because interest is calculated on what you still owe. Enter your own balance, rate and term to see roughly how much time and interest that could save.
Your Mortgage Details
Your Savings Breakdown
New Mortgage Term
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Time Saved
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Current Monthly Payment
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New Monthly Payment
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This calculator gives an illustrative estimate based on the figures you enter, not a quote from any lender. Check your mortgage offer document for your actual overpayment terms, or speak to a broker before making a decision.
See what overpaying could do to your mortgage
This calculator shows what regular overpayments could do to your outstanding balance and remaining term, using the figures you give it. It's built for anyone with a mortgage who wants to see the effect of paying a bit extra each month before deciding whether it's worth doing. Check the guide alongside it if you want help reading what the result actually means for your situation.
No account required · Works on any device · Always free