Berks & Bucks Finance
How much can I borrow? – Mortgage calculator
- All types of mortgages
- All types of people
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Trying to work out how much mortgage you can afford?
A mortgage calculator gives you a quick estimate of what you could borrow — but there’s a bit more to it than just plugging in numbers. Here’s how it works and why it’s only part of the picture.
How does a mortgage calculator work?
A mortgage calculator uses a few key pieces of information to give you a rough idea of your borrowing power. It’s usually based on:
- Your income – This could be your salary, self-employed income, bonuses or rental income.
- Your outgoings – Regular commitments like loans, credit cards, car finance, childcare, and even pension contributions.
- Your deposit – The more you put down, the more options you’ll usually have.
- Length of the mortgage – A longer mortgage term can reduce monthly payments but increase interest over time.
- Interest rates – Calculators use an assumed rate to estimate monthly repayments.
Most lenders will lend around 4 to 5.5 times your annual income – but some go higher in the right circumstances.
What else affects how much you can borrow?
Online tools can’t always factor in the finer details, but real lenders certainly do. Things that affect your affordability include:
- Your credit history and score
- Whether you have any adverse history and the type, i.e. defaults, CCJs
- If you’re on a fixed-term or zero-hours contract
- Your visa status (for non-UK nationals)
- How long you’ve been self-employed
These variables can make a big difference in how much you can borrow — and which lenders will consider your application.
Why you shouldn’t rely on a calculator alone
Mortgage calculators are great for getting a ballpark figure, but they don’t:
- Search the whole of the market
- Understand your unique circumstances
- Factor in the specific lending rules from each bank or building society
That’s where working with a broker makes all the difference.
Let a broker do the heavy lifting
As a mortgage broker, I don’t just rely on rough estimates — I use lender-specific affordability tools and match you to the most suitable mortgage deals available.
Whether you’re:
- A first-time buyer
- Self-employed
- Buying with family
- Or on a visa
I’ll help you understand your true borrowing power, access exclusive deals, and avoid costly mistakes.
Ready to find out how much you can borrow?
Use the calculator for a rough guide — then get in touch for a tailored affordability check and mortgage advice that’s built around you.
Mortgage Affordability Calculator
This information is a guide only and should not be relied on as a recommendation or advice that any particular mortgage is suitable for you.
All mortgages are subject to the applicant(s) meeting the eligibility criteria of the specific lender.
You should make an appointment to receive mortgage advice which will based on your needs and circumstances.
Frequently asked questions
How do lenders decide how much I can borrow?
Lenders look at your income, expenses, credit score, and overall financial situation. They also consider the size of your deposit and the mortgage term. Most lenders use income multiples (e.g., 4.5 times your annual salary) but will adjust this based on affordability checks.
How accurate are online mortgage calculators?
Online calculators provide a rough estimate, but they can’t factor in personal details like credit history, dependents, or variable income. For a precise figure, it’s best to speak to a broker who can check real-time lender criteria.
Can I borrow more if I apply with someone else?
Yes, applying jointly (e.g. with a partner or family member) can boost your borrowing power, as lenders consider combined income. Products like JBSP (Joint Borrower, Sole Proprietor) mortgages may also help with affordability.
Will my credit score affect how much I can borrow?
Yes. A good credit score can increase your borrowing potential and unlock better rates. A poor score may reduce the amount you can borrow or limit your choice of lenders.
Why use a mortgage broker instead of going direct?
A broker searches across multiple lenders, including those not available directly to the public. We know which lenders are more flexible with your circumstances — saving you time, money, and stress.
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