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    Remortgage Calculator

    Step 1: Annual Income

    Employed? Enter your annual income before tax.

    Self-employed? Use your two-year average, or latest year's income if lower. Sole traders/partners: profit after expenses, before personal tax. Company directors: salary before tax plus dividends.

    Joint remortgage? Include both applicants' incomes. If you're unsure, enter your best estimate; our advisers can help.

    Step 2: Existing Equity

    Your equity is your property's estimated current value minus your outstanding mortgage and any other loans secured on it.

    Enter your best estimate of the total equity in your property, rather than the amount of additional money you would like to borrow.

    Step 3: Monthly Financial Commitment Costs

    Include monthly repayments towards credit cards, personal loans, car finance and hire purchase agreements for everyone applying.

    Enter your monthly repayments rather than the total outstanding balances. Lenders will also consider your other living expenses when carrying out a full affordability assessment.

    Step 4: Preferred Mortgage Term

    Your current remaining mortgage term is a useful starting point. You can adjust this to see how a different term affects your repayments.

    A longer mortgage term can reduce your monthly repayments but increase the total interest you pay.

    Step 5: Name

    We'll use your details to provide your mortgage estimate and follow up on your enquiry.

    Step 6: Email

    We'll use your email address to contact you about your mortgage estimate and borrowing options.

    Only one more step before you receive your mortgage estimate.

    Step 7: Phone Number

    You’re almost there. Your mortgage estimate will be displayed on the next screen. Please ensure you include the '07' prefix when entering your phone number.

    By submitting, you confirm that you agree with our privacy policy and consent to us contacting you by email and phone. You can opt out at any time.

    This is an estimate based on the information you've provided. Your actual remortgage borrowing potential will depend on your financial circumstances, property value, available equity and individual lender criteria. This figure is not the amount of additional cash you could release. Your existing mortgage and any other secured borrowing would need to be repaid, and fees or early repayment charges may also apply. One of our mortgage advisers will be in touch by email and phone to talk through your results and discuss your remortgage options. Boon Brokers is FCA regulated and provides fee-free, whole-of-market mortgage advice, with no obligation to proceed.
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    Expert-Reviewed Remortgage Calculator

    Reviewed by: Gerard Boon

    Managing Director, Boon Brokers

    B.A (Hons), CeMAP, CeRER

    Last reviewed: 28 October 2026

    Gerard has reviewed this Remortgage Calculator’s calculation method, assumptions and supporting remortgage guidance for accuracy and clarity.

    The results are an estimate based on the information you enter and the calculator’s assumptions. They do not constitute a mortgage offer or personalised mortgage advice.

    How Much Can You Borrow When Remortgaging?

    Our free Remortgage Calculator helps you estimate how much you could borrow against a property you already own, whether you’re switching mortgage lenders, looking to borrow additional funds or taking out a mortgage on a property you own outright. 

    Simply enter a few details, including your annual income, financial commitments and preferred mortgage term, to get an initial estimate of your total borrowing potential.

    Our fee-free mortgage advisers can then review your existing mortgage and financial circumstances to help you understand your remortgage options.

    Contact a Fee-Free Adviser

    What Can You Do With Your Remortgage Calculator Results?

    Your Remortgage Calculator result gives you an initial estimate of your total borrowing potential.

    This can be a useful starting point when considering your next steps, whether you’re exploring your options independently or discussing your circumstances with a mortgage adviser.

    With a better understanding of how much you could borrow, you can start to explore whether you may be able to:

    • Switch mortgage deals: Replace your existing mortgage with a new deal from a different lender.
    • Borrow additional funds: Compare your estimated borrowing potential with your outstanding mortgage balance to see whether extra borrowing may be possible.
    • Review your mortgage options: Consider your borrowing position when exploring different mortgage products and lenders.

    When you remortgage your property, your new mortgage is used to repay your existing loan. If you’re looking to borrow more, this will depend on factors such as your property value, available equity and the lender’s affordability criteria.

    It’s important to remember that your calculator result is only an estimate, and the amount you could borrow may differ. Our fee-free mortgage advisers can review your circumstances in more detail and help you explore suitable options across the market.

    Get Personalised Advice

    Looking for a Different Calculator?

    Looking for a different type of mortgage? Whether you’re moving home, considering equity release or exploring your options, our other calculators can help you get an initial estimate of your borrowing potential.

    Your home may be repossessed if you do not keep up repayments on your mortgage. 

    Boon Brokers Limited is authorised and regulated by the Financial Conduct Authority (FCA). The Financial Services Register number is 973757. The FCA does not regulate some Buy to Let mortgage contracts. We do not charge a fee for our mortgage, insurance or equity release advice and arrangement services. Calls may be recorded for training and monitoring.