Mortgage & Property Calculators

If you’re planning a property purchase, refinance or investment, getting the numbers right early makes everything easier.Our free calculators give you quick, practical estimates for borrowing, repayments, property costs and investment returns — whether you’re buying at auction, arranging bridging finance, or reviewing a Buy-to-Let.

Use these tools to sense-check your figures, explore different scenarios, and prepare for a proper conversation with a specialist adviser.

Affordability & Repayments

These calculators help you understand what you may be able to borrow and how your mortgage payments could look over time.

Mortgage Repayment
Calculator

Estimate monthly payments based on loan amount, interest rate and term.

How Much Can I Borrow
Calculator

Get a quick borrowing estimate based on income, before full lender checks.

Rate Change
Calculator

See how your monthly payment could change if interest rates rise or fall.

Remortgage
Calculator

Compare your current mortgage with a new deal and assess potential savings.

Overpayment
Calculator

See how regular or one-off overpayments could reduce interest and shorten your term.

Mortgage Amortisation
Calculator

Understand how your balance reduces over time and how much interest you pay overall.

UK Stamp Duty
Calculator

Estimate stamp duty costs for home movers, first-time buyers and additional properties.

Loan To Value (LTV)
Calculator

Check your Loan-to-Value and understand how deposit or equity affects your options.

Bridging Loan
Calculator

Estimate bridging interest and costs to sense-check short-term finance.

Rental Yield
Calculator

Calculate gross rental yield using purchase price and monthly rent.

Buy-to-Let (BTL)
Calculator

Quick estimates for Buy-to-Let payments and returns.

HMO Mortgage
Calculator

Estimate borrowing figures and stress-test style calculations for HMOs.

Buy-to-Let Total to Pay
Calculator

See the estimated total cost over the mortgage term, including interest and fees.

Debt Consolidation
Calculator

Explore whether consolidating existing borrowing could reduce monthly outgoings.

What these calculators are for

These calculators are designed to help you plan quickly and confidently. They allow you to:

Important note: Calculator results are estimates only. Your actual options will depend on lender criteria, credit profile, property type and underwriting.

Case studies

Buy-to-Let investor comparing returns

An investor used the rental yield and total-to-pay calculators to compare two properties, helping them identify the stronger long-term investment.

Homeowner facing a rate change

A homeowner used the rate change and remortgage calculators to see how rising rates would affect payments, then secured a new deal before their fixed rate ended.

Homeowner facing a rate change

A homeowner used the rate change and remortgage calculators to see how rising rates would affect payments, then secured a new deal before their fixed rate ended.

Frequently Asked Questions

No. They provide planning estimates only. A confirmed figure requires a full lender assessment.
No. There are no credit checks and nothing is recorded.
Yes. The calculators are based on UK mortgage assumptions and typical lender approaches.
Yes. They’re particularly useful for early planning, especially when timescales are tight.
Yes. The calculators give a starting point, and we then match you with lenders suited to your property and structure.

Plan smarter. Move faster.

Use our free calculators to understand the numbers — then speak to Auction Finance UK for expert guidance, lender matching and help securing the right finance for your situation. Whether you’re buying at auction, investing, or restructuring existing borrowing, we’ll help you move forward with clarity and confidence.