Mortgage Borrowing Calculator

    Step 1: Annual Income

    Employed? Enter your annual income before tax.

    Self-employed? Use your two-year average, or latest year if lower. Sole trader/partner: Profit (or share) after expenses, before personal tax. Company director: Salary before tax plus dividends.

    Joint application? Include both incomes. Unsure? Enter your best estimate; our advisers can help.

    Step 2: Deposit / Existing Equity

    Buying a property? Enter the deposit you plan to use towards your purchase.

    Remortgaging? Enter your property's estimated current value minus your outstanding mortgage and any other loans secured on it.

    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

    If you’re unsure, enter 30 years for now. You can always adjust this to see how a different mortgage term affects your repayments.

    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. The amount you could borrow will depend on your circumstances and individual lender criteria, which our fee-free mortgage advisers will be able to explore with you. One of our mortgage advisers will be in touch by email and phone to talk through your results and discuss your options. Boon Brokers is FCA regulated and provides fee-free, whole-of-market mortgage advice, with no obligation to proceed. We share mortgage tips and more.

    Expert-Reviewed Mortgage Borrowing Calculator

    Reviewed by: Gerard Boon

    Managing Director, Boon Brokers

    B.A (Hons), CeMAP, CeRER

    Last reviewed: 29 October 2026

    Gerard has reviewed this Mortgage Borrowing Calculator’s calculation method, assumptions and supporting mortgage 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.

    Find Out How Much You Could Borrow

    Our free mortgage borrowing calculator will provide you with an instant estimate of how much you could borrow for a mortgage, whether you’re buying your first home, moving house or looking to remortgage.

    Simply enter your annual income, deposit or existing equity, financial commitments and preferred mortgage term to receive an initial estimate of your borrowing potential.

    For a more detailed understanding of your borrowing power, our fee-free mortgage advisers can take a closer look at your income, financial commitments and personal circumstances to help you understand how much you may realistically be able to borrow and which mortgage options are suitable for you.

    Speak to a Fee-Free Adviser

    What Can You Do With Your Mortgage Calculator Results?

    Your mortgage borrowing calculator result provides an initial estimate of how much you could borrow, based on the financial information you’ve provided.
    With a clearer idea of how much you could borrow, you can start to explore:

    • Your property budget: Combine your estimated mortgage borrowing with your available deposit to get an idea of the property prices you could consider.
    • Your mortgage options: Explore different mortgage types, products and terms to understand what might be suitable for your circumstances and financial plans.
    • Your next steps: Whether you’re buying or remortgaging, use your estimate to guide discussions with your mortgage adviser and consider whether you’re ready to proceed with an application.

    Remember, your result is only an estimate. Your actual borrowing potential will depend on your financial circumstances and individual lender criteria.

    Get in Touch

    Personalised Mortgage Advice

    Our fee-free mortgage advisers can help you understand your calculator results and explore suitable mortgage options.

    With whole-of-market access to over 1,000 mortgage products, we can assess your circumstances against different lenders’ affordability criteria, helping you understand your borrowing potential and plan your next steps with confidence.

    And the best part? Our personalised mortgage advice won’t cost you a penny.

    Get Personalised Advice

    Looking for a Different Calculator?

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

    Frequently Asked Questions

    What Information Do I Need for a Mortgage Borrowing Calculator?

    To use our mortgage borrowing calculator, all you need is your annual income, available deposit or existing equity, monthly financial commitments and preferred mortgage term.

    If you’re unsure of any figures, you can enter your best estimate. However, providing accurate information will help make your borrowing calculation more useful.

    Can I Borrow More Than My Mortgage Calculator Estimate?

    Yes, you may be able to borrow more than your calculator estimate, depending on your income, financial circumstances and the lender’s affordability criteria.

    Different mortgage lenders use their own income multipliers and affordability assessments, meaning your actual borrowing potential could be higher or lower than the amount shown.

    Will Using a Mortgage Borrowing Calculator Affect My Credit Score?

    No, using our mortgage borrowing calculator will not affect your credit score.

    Is My Mortgage Borrowing Calculator Result an Agreement in Principle?

    No, your mortgage borrowing calculator result is an initial estimate and is not the same as an Agreement in Principle (AIP).

    Neither a calculator estimate nor an AIP guarantees that your full mortgage application will be approved.

    A mortgage broker can help you obtain an AIP and will work with you to submit a full mortgage application.

    How Accurate Is Our Mortgage Borrowing Calculator?

    Our Mortgage Borrowing Calculator provides an initial estimate based on your income, deposit or available equity, financial commitments and preferred mortgage term.

    However, your actual borrowing potential may differ depending on your credit history, financial circumstances and individual lender criteria, including the income multiples they use.

    Our fee-free mortgage advisers can provide a more personalised assessment and help you explore suitable options.

    Why Is My Mortgage Calculator Result Lower Than Expected?

    Your estimated borrowing amount may be lower than expected because our Mortgage Borrowing Calculator considers more than just your income.

    Your deposit or available equity, financial commitments and preferred mortgage term can all affect your result. Individual lenders may also assess your affordability differently, meaning you could borrow more or less than estimated.

    Our fee-free advisers will be able to provide you with more detailed, personalised advice and can explore suitable options for your circumstances.


    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.