Mortgages

Mortgage affordability calculator how much could you borrow?

Enter your income, outgoings, and deposit to get an instant estimate of what you could borrow, then speak to an advisor to see how it fits your circumstances.

  • Instant estimate based on your income and outgoings
  • No impact on your credit score
  • Works for employed, self-employed, and joint applications

Think carefully before securing other debts against your home. Your home or property may be repossessed if you do not keep up repayments on your mortgage.

How much can I borrow with a mortgage affordability calculator?

A mortgage affordability calculator estimates how much you could borrow by looking at your income, your regular outgoings, and the deposit you have saved.

  • Income: most lenders will consider lending up to around 4 to 4.5 times your annual income, though this varies by lender and circumstances.
  • Outgoings: monthly commitments such as credit cards, loan repayments, and subscriptions reduce how much you can borrow.
  • Deposit: a larger deposit reduces the amount you need to borrow and can open up a wider range of lenders.

The figure a calculator gives you is an estimate rather than a guarantee. Speak to an advisor to find out what you could realistically borrow based on your full circumstances.

Ready to find out what you could borrow?

Speak to a mortgage advisor about your income, outgoings, and deposit to get a clearer picture of your options.

What affects your mortgage borrowing?

A mortgage affordability calculator gives you an estimate of what you could borrow, but lenders look at several factors before agreeing a mortgage. Here's what counts most.

  • Your income: the more you earn, the more you can typically borrow. This includes your salary as well as bonuses, freelance income, and, in some cases, benefits. Many lenders will consider lending up to around 4 to 4.5 times your annual income, though this varies by lender.
  • Your expenses: lenders want to know what you're spending each month, including credit card payments, loan repayments, school fees, and subscriptions. Higher fixed outgoings can reduce the amount you're able to borrow.
  • Your commitments: outstanding loans or debts are taken into account too. A large car loan or credit cards close to their limit can make you look like a higher risk to a lender, though it won't necessarily rule you out.

Your home may be repossessed if you do not keep up repayments on your mortgage or any other debt secured on it.

Expert insight

Lawrence Howlett

Income multiples vary a lot between lenders, and some will stretch further for certain professions or if you're borrowing at a lower loan-to-value. If the calculator's estimate feels tight, it's worth speaking to an advisor before ruling anything out.

Lawrence Howlett,Founder of Money Saving Advisors

How does a mortgage affordability calculator work?

Our affordability calculator is designed to be simple to use while still giving you a realistic estimate. Here's what it does.

  • Quick results: enter a few details, such as your income, outgoings, and deposit amount, and the calculator gives you an instant estimate of what you could borrow. It's much faster than waiting to hear back from a lender.
  • Based on common lending criteria: the calculator uses assumptions based on typical lender requirements. It isn't a formal mortgage offer, but it gives you a realistic figure that reflects what many banks and building societies might lend.
  • Useful for planning: knowing what you could afford helps you search for properties in the right price range. For example, if the calculator shows you could borrow £250,000 and you have a £50,000 deposit, you could start looking at homes priced around £300,000.

Using the calculator has no impact on your credit score, as it doesn't run a credit check or require sensitive personal details.

What happens next

What happens after you get your estimate

1

Use the calculator

Enter your income, outgoings, and deposit to get an instant estimate of what you could borrow.

2

Speak to an advisor

Talk through your result and how it compares with current lending criteria for your circumstances.

3

Get an agreement in principle

A lender reviews your details and confirms, in principle, how much they'd be willing to lend.

4

Search with a realistic budget

With a clearer idea of what you can afford, you can focus your property search on homes within reach.

5

Submit your full application

Your advisor helps gather the right documents and submits your application to a suitable lender.

Next steps

Want a clearer picture before you apply?

An advisor can talk through your income, outgoings, and deposit to see how it compares with current lending criteria.

App mockup

Tips for improving your mortgage affordability

If the number from the calculator is lower than you'd hoped, there are practical steps that can improve it.

  • Reduce your debts: pay down loans and credit cards where you can. Lowering your monthly outgoings frees up more of your income for mortgage repayments.
  • Improve your credit score: check your credit report for errors, make payments on time, and avoid making several new credit applications in a short space of time. These steps can make you look more reliable to lenders.
  • Consider a joint application: buying with a partner or family member can significantly increase your combined income and the amount you can borrow. Bear in mind you'll both be responsible for the mortgage.

Using a mortgage affordability calculator is a useful first step when you're planning to buy. It gives you a realistic idea of what you might be able to borrow, so you can focus your search and plan ahead.

If you're feeling unsure about affordability or already juggling other debts, MoneyHelper offers independent, government-backed guidance on 0800 138 7777 or at moneyhelper.org.uk.

Good to know

Lawrence Howlett

Small changes can make a real difference. Clearing even one credit card balance or correcting an error on your credit report a few months before you apply can shift the figure a calculator gives you.

Lawrence Howlett,Founder of Money Saving Advisors

Before you apply

Documents you'll need when you apply

Proof of income

Recent payslips if you're employed, or two to three years of accounts or tax returns if you're self-employed.

Bank statements

Usually the last three months, showing your income and regular outgoings.

Proof of ID and address

A passport or driving licence, plus a recent utility bill or council tax statement.

Why speak to an advisor before you apply?

Speak to an advisor about your income, outgoings, and deposit.

  • Access to lenders not always available on the high street
  • Guidance for self-employed, contract, and joint applications
  • Access expert advice with no pressure to proceed

Common questions

Frequently asked questions

No, using a mortgage affordability calculator has no impact on your credit score. It doesn't run a credit check or ask for sensitive personal information. It simply gives you a general idea of what you might be able to borrow, based on the numbers you enter, and doesn't leave a mark on your credit file.

The calculator gives you a solid estimate based on general lending criteria used by UK mortgage providers. However, each lender assesses applications differently, taking into account factors like credit history, employment type, other income, and savings. For the most accurate figure, speak to a mortgage advisor once you've used the calculator as a guide.

Yes, the calculator works for self-employed applicants too. Enter your average net profit from the past two or three tax years. Some lenders may ask for extra documentation, such as SA302s or full accounts, but the calculator will still give you an idea of what you could borrow based on the income you enter.

Even with a poor credit history, you may still be eligible for a mortgage, though the amount you can borrow could be lower. Our calculator gives an estimate based on typical lending rules, but speak to an advisor about specialist lenders who consider applicants with credit issues.

Yes, you can use our calculator to work out your remortgage affordability. If you include your outstanding mortgage balance as one of your debts or expenses, the calculator can help you assess whether a new mortgage fits your budget and whether lenders are likely to approve it based on your financial situation.

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Mortgages

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This article was written by:

Lawrence Howlett
Lawrence Howlett

Founder of Money Saving Advisors

Lawrence Howlett brings a results-driven mindset to his writing, shaped by over a decade of experience across finance, legal, and energy sectors. As the founder of Moneysavingadvisors, he’s built a reputation for turning complex financial concepts into clear, actionable insights for consumers. His writing stands out for its clarity, structure, and focus on delivering value.

Article last updated 19 July 2026

Reviewed by Nick McDonald on 19 July 2026