Property Investment Resources & Calculators
Built for UK property investors, landlords, developers, and businesses.
Make smarter property decisions with our practical property calculators and investment tools. Whether you are assessing a buy to let mortgage, stress testing rental income, or calculating stamp duty, these resources are designed to give you clear numbers you can trust before you commit.
Each calculator reflects commonly applied lender affordability models or current UK property tax rules, providing a practical starting point for investment planning.
These calculators are designed to support early-stage scenario modelling and comparison, helping investors understand how changes to rates, deposits, rents or purchase prices may affect outcomes. Final lending and tax positions will always depend on individual circumstances and criteria at the time.
Estimate potential monthly mortgage payments for a new buy to let property purchase. Model how changes to interest rates, repayment methods and loan-to-value (LTV) can affect projected mortgage costs.
Estimate potential remortgage payments for an existing buy to let property. Explore how changes to loan amount, interest rates and loan-to-value (LTV) could affect monthly costs and equity that may be available.
Stress test your property investment against higher interest rates and interest cover ratios. This calculator shows whether your rental income meets typical stress testing requirements from mortgage lenders.
Estimate Stamp Duty Land Tax on residential and buy to let property purchases, including higher-rate surcharges for additional homes. Understand SDLT costs so you can budget accurately.
Estimate stamp duty on non-residential property and land across the UK. The calculator applies the relevant SDLT, LBTT or LTT rates based on property location, helping you compare acquisition costs across jurisdictions.
These tools are used alongside our wider property finance guides and insights, which explain how lenders assess affordability, structure funding and evaluate risk across different property investment scenarios.