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About this tool

What Mortgage Calculator does

A free UK mortgage calculator that estimates monthly payments and total interest costs for residential property purchases. Users input the property price, loan amount, interest rate, and mortgage term to compare repayment and interest-only loan scenarios. The tool outputs principal and interest paid monthly, along with total interest costs, helping homebuyers and property investors model affordability before committing to a loan. As part of the AssetCasa suite of UK property research tools, it simplifies mortgage planning with scenario testing. Results update dynamically as values are entered, and the interface includes a Bank of England Bank Rate reference with historical data to inform rate selection. The calculator also factors in loan-to-value ratios, with a default of 60% adjustable to match lender offers. It provides amortization-style details without requiring a login or subscription.

Step by step

How to use the AssetCasa Mortgage Calculator

  1. 1

    Enter the property purchase price in the property price field

  2. 2

    Input the loan amount or adjust the loan-to-value percentage to reflect your deposit

  3. 3

    Set the annual interest rate or select from the Bank of England Bank Rate reference history

  4. 4

    Choose the mortgage term in years; the calculator converts this to months automatically

  5. 5

    View the estimated monthly repayment, total interest cost, and comparison of repayment versus interest-only methods

Is it right for you

Best for

Homebuyers and property investors in the UK who want to model repayment and interest-only mortgage scenarios before committing to a loan, particularly those who want to reference current and historical Bank of England rates.

Limitations

  • Designed for UK residential property; may not suit non-UK loan structures or currencies
  • Relies on user-input rates; does not guarantee lender-approved rates
  • Loan-to-value default is 60%; users with different deposit sizes must manually adjust the percentage
Questions

Mortgage Calculator FAQ

Can I use this calculator for buy-to-let or commercial mortgages?
The tool is designed for residential property purchases and may not accurately model buy-to-let or commercial mortgage structures, which often have different interest calculation methods and affordability assessments.
How does the loan-to-value ratio affect my results?
The loan-to-value percentage determines the loan amount based on the property price; a higher LTV means a larger loan and higher monthly payments, while a lower LTV reflects a bigger deposit and reduced borrowing costs.
What if I don't know the exact interest rate I'll be offered?
You can either enter a custom rate or select from the Bank of England Bank Rate reference history, which shows past official rates to help you estimate a realistic figure for your mortgage quote.
Does the calculator include property taxes and insurance in the monthly payment?
No, the tool estimates principal and interest only; property taxes, home insurance, and other housing costs are not factored into the monthly payment total.
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