Mortgage affordability calculator
Mortgage affordability calculator UK: how much can you realistically borrow?
Use salary, deposit, interest rate, and monthly commitments to estimate a borrowing range, monthly payment, and how the budget behaves if rates stay higher for longer.
Illustrative only. Review assumptions and disclaimer details before relying on the outputs.
What you'll get
- A cautious and standard borrowing range.
- An estimated monthly repayment based on your likely loan size.
- Stress scenarios at 5%, 6%, and 7% interest.
What this tool is for
- Pressure-test a budget before an agreement in principle.
- Compare simple scenarios without handing data to a lead form.
- Understand how rates, deposits, and monthly costs change the picture.
Quick notes about this tool
What you'll get
- A cautious and standard borrowing range.
- An estimated monthly repayment based on your likely loan size.
- Stress scenarios at 5%, 6%, and 7% interest.
What this tool is for
- Pressure-test a budget before an agreement in principle.
- Compare simple scenarios without handing data to a lead form.
- Understand how rates, deposits, and monthly costs change the picture.
Your scenario updates the page URL so you can revisit it later.
Cautious borrowing range
£257,750
Standard borrowing range
£290,250
Estimated monthly payment
£1,538
Indicative upfront cash
£48,350
Want to break out purchase tax too? Carry this property price and deposit into the stamp duty calculator.
Check stamp dutyStress test
Loan-to-value: 86.2%
At 5% interest
Monthly payment £1,503
At 6% interest
Monthly payment £1,679
At 7% interest
Monthly payment £1,863
The loan needed sits above the cautious range, so the budget may feel tight.
What this means
Use the cautious number as a comfort check and the standard number as a rough ceiling, not a target you must stretch to reach.
- If the property price is set, this planner compares the loan you need (£280,000) with the ranges above.
- A bigger deposit improves loan-to-value as well as the monthly payment, so it can change product choice as much as affordability.
- The stress-rate cards matter most if you expect your fixed rate to end before your budget has much breathing room.
How to use this mortgage affordability calculator
Start with your gross annual salary, add any second income that is genuinely part of the budget, and then enter the deposit you expect to use. If you already have a target property price in mind, enter that too so the calculator can compare the loan needed with the borrowing range.
If you are still deciding on a deposit target, the deposit guide is a good companion page to read alongside this calculator.
What affects the result most
- Your income still matters, but committed costs and childcare can noticeably reduce the comfortable borrowing range.
- A bigger deposit helps twice: it can shrink the loan needed and improve loan-to-value.
- The stress-rate view matters if you want to know whether the payment still feels manageable after a fixed deal ends.
If your question is still really about how much you can borrow in principle, the borrowing guide breaks that down in plain language.