Free UK Mortgage Calculator
Estimate your monthly mortgage payments, total interest, and loan-to-value (LTV) in seconds.
This tool provides estimates only and is not financial advice.
How this free UK mortgage calculator helps
Whether you are buying your first home, remortgaging, or comparing lender offers, a quick monthly payment estimate can save you hours. This free UK mortgage calculator gives you a fast snapshot of what your payments could look like based on your property price, deposit, interest rate, and term.
Instead of trying to do finance maths manually, you can test different scenarios in seconds. For example, you can see what happens when you:
- Increase your deposit to reduce your borrowing.
- Change from a 25-year term to a 30-year term.
- Try a different interest rate to model fixed or tracker deals.
- Add a monthly overpayment to clear your mortgage earlier.
What the calculator includes
1) Repayment mortgage calculations
A repayment mortgage is the most common option in the UK. Your monthly payment includes interest and part of the original loan amount. Over time, your balance reduces to zero by the end of the term.
2) Interest-only mortgage calculations
With interest-only, your monthly payment covers only interest. The original loan amount is usually repaid at the end through savings, investments, or sale proceeds. The calculator shows the monthly interest cost and total interest over the term.
3) Core figures you can use immediately
- Loan amount after deposit and optional fee.
- LTV (Loan-to-Value) so you can compare lender bands.
- Estimated monthly payment based on the selected mortgage type.
- Total paid and total interest over the term.
- Payoff date estimate for repayment plans.
Understanding mortgage costs in the UK
Your monthly repayment is only one part of homeownership costs. Before applying, it is wise to budget for:
- Solicitor and conveyancing fees.
- Survey and valuation costs.
- Stamp Duty Land Tax (where applicable).
- Buildings insurance and ongoing maintenance.
- Potential rate changes after a fixed deal ends.
If you are close to affordability limits, stress-test your budget with a higher rate than today. This can help you avoid surprises when rates change.
How to get better mortgage offers
Improve your LTV position
In many cases, lower LTV can unlock better rates. Even a slightly larger deposit can shift you into a cheaper pricing tier.
Build a clean credit profile
Pay bills on time, keep card balances under control, and avoid unnecessary credit applications before applying for a mortgage.
Compare total cost, not just the headline rate
A low rate with high fees is not always cheapest. Use this calculator with fee assumptions to compare deals more fairly.
Frequently asked questions
Is this calculator accurate?
It is accurate for standard estimation formulas, but lender affordability rules, fees, insurance requirements, and product-specific terms can change your final figures.
Can I use this for remortgaging?
Yes. Enter your current property value, outstanding balance (as loan), and your expected new rate and term to estimate future monthly costs.
Do overpayments really make a big difference?
Often yes. Even modest overpayments can reduce total interest and shorten your mortgage term significantly. Use the calculator to model the effect on your specific numbers.
Final note
This free UK mortgage calculator is designed to give you a practical starting point. For decisions involving large financial commitments, consider speaking with a qualified mortgage adviser to review your full circumstances, eligibility, and product options.