About Mortgage Overpay
Mortgage Overpay was created to give UK homeowners a simple way to understand how overpayments can affect their mortgage.
What the site is for
Simple scope is part of the value.
Many mortgage tools are overly complex, require sign-ups, or focus on selling products. This site takes a different approach by providing a fast, straightforward calculator that helps you see how overpaying could change your mortgage-free date and the total interest you pay.
The goal is simple: to offer a free, easy-to-use tool that helps you make more informed decisions about your mortgage.
Assumptions and limitations
Clear limitations build trust.
This calculator is based on standard UK repayment mortgage assumptions, including monthly interest calculations and reducing balances over time. It is designed to give clear estimates that can help with planning, but it does not replace personalised financial advice.
If you are considering making changes to your mortgage, it is always worth reviewing your lender’s terms and, where appropriate, speaking to a qualified adviser.
Use the calculator with your own figures
If you want to see how the model behaves in practice, the calculator is the fastest place to start.