UK Mortgage Repayment Calculator (2025) – Monthly Payments, LTV & Overpayments
UK Mortgage Repayment Calculator (2025) – Monthly Payments, LTV & Overpayments
Try our free UK mortgage repayment calculator to estimate your monthly payments in GBP (£), LTV (loan-to-value), total interest and the impact of overpayments. Compare Repayment vs Interest-only in seconds. Mobile-friendly, no sign-up.
How to use this UK mortgage calculator
- Choose a mode: enter property price + deposit (to see LTV) or loan amount only.
- Add your rate: annual % (e.g. fixed for 2–5 years). Enter the term in years (e.g. 25).
- Select type: Repayment (capital & interest) or Interest-only.
- Optional: monthly overpayment to see time and interest saved.
What is LTV and why it matters in the UK
LTV (Loan-to-Value) = loan ÷ property price. Lower LTVs (for example 60–75%) can unlock better UK mortgage rates, subject to lender criteria and affordability checks.
Repayment vs Interest-only
A repayment mortgage clears the balance to £0 by the end of the term. An interest-only mortgage keeps payments lower but the capital remains outstanding until you repay it, refinance or sell. Always check overpayment allowances and any early-repayment charges.
Disclaimer
This tool provides estimates only and is not financial advice. Speak to a qualified adviser before making decisions.
UK Mortgage Calculator – FAQs
How accurate are the results?
This tool uses standard UK amortisation maths. It gives strong estimates for fixed-rate periods, but your lender’s fees, incentives and product rules can change outcomes. Always verify with a broker or lender.
Which interest rate should I enter?
Use the annual rate quoted by your lender or broker for your current or target product. For trackers, enter the current rate; results will change if the base rate moves.
Does this work for remortgages?
Yes. Enter your remaining loan as the amount (or price minus equity if you know the property value) and set the new rate and term you’re considering.
What is LTV and why does it matter?
LTV (loan-to-value) is loan ÷ property price. Lower LTV bands usually unlock better UK mortgage pricing, subject to affordability and criteria.
Are fees like product fees or valuation included?
No. The calculator focuses on rate, term and overpayments. Add any upfront or added-to-loan fees separately when comparing real products.
Can I model interest-only?
Yes. Choose “Interest-only” to see monthly interest. Overpayments will then reduce capital; otherwise the balance remains outstanding at term end.
Do overpayments shorten the term or reduce the payment?
By default we show term reduction (faster payoff). Some lenders let you reduce monthly payments instead—check your specific product rules.
What term should I pick (e.g., 25 vs 30 years)?
Longer terms lower monthly payments but increase total interest. Shorter terms raise monthly payments but clear the loan faster. Test both and consider affordability.
How do I lower my monthly mortgage payment?
Options include a lower rate, a longer term, a bigger deposit/equity to reduce LTV, or switching product. Remember overall interest can rise with longer terms.
Does the calculator store my data?
No accounts or cookies are required. Inputs stay in your browser. Use the “Copy link” button to share your figures if you wish.
Why are my results different from the lender’s?
Lenders can include fees, different rounding rules, and product-specific payment policies. Treat this as guidance and compare official illustrations (ESIS/KFI).
Can I compare repayment vs interest-only quickly?
Yes. Switch the “Repayment type” dropdown and recalculate. You’ll see changes in required payment, total interest and any remaining balance.
Does the calculator work for buy-to-let?
It can estimate payments, but BTL underwriting often uses stress rates and rental coverage tests. Check criteria for the specific lender.
How do I share my results?
Use “Copy link” to generate a URL with your inputs. Paste it into email or chat so others can open the same scenario instantly.
Is this financial advice?
No. It’s an educational tool. Speak to a qualified UK mortgage adviser or your lender before making borrowing decisions.
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