Jack Tools

House Affordability Calculator

Estimate how much house you may be able to afford based on income, deposit, debts, mortgage rate, and term.

Enter affordability details

£
£
£
x
%
yrs

This estimate uses an income multiple and a simple repayment assumption to give a rough affordability guide.

Estimated property price
£0.00
Estimated mortgage amount: £0.00
Estimated mortgage
£0.00
Monthly payment
£0.00
Income-based borrowing
£0.00
Loan-to-value
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Affordability breakdown

Annual household income £0.00
Monthly commitments £0.00
Deposit £0.00
Affordability multiple 0.00x

How This House Affordability Calculator Works

This house affordability calculator gives a rough estimate of how much property you may be able to afford based on your annual income, monthly financial commitments, deposit, mortgage rate, and term.

The calculator starts with a simple income multiple to estimate the size of mortgage you may be able to borrow. It then reduces that figure to reflect any ongoing monthly debts or commitments, which can affect affordability in real mortgage assessments.

Once the estimated mortgage is calculated, the calculator adds your deposit to estimate a maximum property price and uses the interest rate and term to show an estimated monthly mortgage payment.

This is designed as a planning tool, not a lender decision tool, so it works best as a quick guide before using a full mortgage affordability assessment.

Annual household income This is the total yearly income used to estimate how much a lender may be willing to offer.
Monthly commitments These include debts and regular obligations such as loans, car finance, credit cards, or maintenance payments.
Deposit Your deposit reduces the mortgage needed and increases the maximum property price you may be able to buy.
Affordability multiple This is the income multiplier used to estimate borrowing, such as 4x, 4.5x, or 5x income.
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Example House Affordability Scenarios

Single buyer example
Income£45,000
Deposit£20,000
Multiple4.5x
Est. price = £222,500
Couple buying together
Income£70,000
Deposit£40,000
Multiple4.5x
Est. price = £355,000
With monthly debts
Income£60,000
Debts£400/mo
Deposit£30,000
Est. price = around £276,000
Larger deposit
Income£55,000
Deposit£60,000
Mortgage est.£247,500
Est. price = £307,500

House Affordability Calculator FAQs

This calculator estimates how much property you may be able to afford based on income, debts, deposit, and mortgage assumptions. It is designed as a guide rather than a lender decision tool.
An affordability multiple is the number used to estimate borrowing based on income. For example, borrowing at 4.5 times income means a household earning £60,000 may be estimated to borrow around £270,000 before other adjustments.
Yes. Existing monthly commitments can reduce how much you may be able to borrow because lenders usually consider your other financial obligations when assessing affordability.
No. This is only a general estimate. Actual lender decisions depend on credit history, income type, deposit size, property details, outgoings, and lender-specific rules.
The monthly payment estimate helps give context to the borrowing figure, so you can see how the estimated mortgage might translate into an approximate repayment amount.
No. This is a simplified estimate for planning purposes. Real lender affordability checks can include stress testing, credit scoring, employment details, and other underwriting criteria.

Related tools

Mortgage Calculator Estimate monthly repayments from your loan size. Borrowing Power Calculator See how income and commitments affect borrowing. Stamp Duty Calculator Estimate extra purchase costs on a property.