Mortgage Overpayments | Reduce your Interest
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Overpaying your mortgage can dramatically reduce both the time it takes to clear your loan and the amount of interest you pay overall. Our free UK Mortgage Overpayment Calculator helps you instantly see the impact of making regular overpayments or adjusting your monthly commitment. Whether you have a single mortgage or multiple parts with different rates, this tool shows clear savings in years, months and total interest—giving you complete transparency before making any financial decisions.
At Greywood Financial, we specialise in helping borrowers structure their mortgages efficiently, maximise savings, and stay fully informed about their options. Use the calculator below to estimate your impact, and feel free to contact our advisors if you’d like personalised guidance.
*Please note that this is for illustrative purposes only, lenders calculate interest payable differently. Please speak to an advisor for more information.
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Mortgage Overpayment Calculator
Add each part of your mortgage, enter the current balance and interest rate, then either the existing monthly payment or the remaining term. You can also include regular overpayments to see how much faster you could repay and how much interest you might save.
How your mortgage balance falls over time
This graph compares how your overall mortgage balance reduces over time with your current repayments versus with your chosen overpayments.
Update your figures in the calculator above and click “Calculate overpayment impact” to refresh this graph.
Mortgage term with and without overpayments
This chart compares how long your mortgage would run on the current set-up versus with your overpayments. If you have more than one part, it will show each part and the overall position.
Update your figures in the calculator above and click “Calculate overpayment impact” to refresh this graph.