Enter your mortgage details to estimate your remaining balance. If your rate or payment has changed since you took out the mortgage, add each deal period for a more accurate picture.
Add an estimated property value to see your loan-to-value (LTV) and how close you are to the next common lender band.
Rate and payment changes
Mortgage deals do not last forever. If your fixed, tracker, or discount period has ended and you have renewed onto a new deal or moved onto your lender's SVR, add each change below for a better estimate.
After 26 payments, you have repaid £15,070 of the original loan, your remaining balance is £284,930, and you have paid £31,730 in interest so far.
Repayment mortgages are front-loaded with interest, so a larger share of each early payment covers interest before the balance starts to fall noticeably. This is normal and does not mean you are not making progress.
If your current rate and payment stay the same, you have around 260 payments left, could finish in November 2047, and may pay £181,526 more in interest.
This calculator treats your mortgage as a standard repayment loan. Each month, interest is added to the outstanding balance and then your monthly payment is taken off. The remaining balance after each payment becomes the starting point for the next month.
That means the early years are usually interest-heavy. Even when you make every payment on time, the balance can feel like it is falling slowly at first because a larger slice of each payment is covering interest.
If you have had rate changes between deals, for example moving from a fixed rate to a tracker or your lender's SVR, the calculator applies each rate and payment for the period it covers. Each deal period runs until the next one starts, keeping the payment constant within each period.
Many lenders let you overpay by a set amount each year without an early repayment charge (ERC), often up to 10% of the outstanding balance. This calculator does not account for overpayments. If you have made any, your actual balance will be lower than the estimate.
Your lender's live balance can still differ from this estimate if the mortgage has had fees, arrears, payment holidays, or interest-only periods. Use this as a planning guide rather than an exact statement figure.
- How accurate is this calculator?
- This calculator gives you an estimate, not your lender's exact balance. Fees, arrears, payment holidays, interest-only periods, or charges added to the mortgage can all change the real figure.
- What information do I need to calculate my remaining mortgage balance?
- You'll need four key pieces of information:
- Original mortgage amount
- Current monthly payment
- Current interest rate
- Start date of your mortgage payments (month and year)
- Why might my actual remaining balance be different from the calculator's result?
- Several factors can affect your actual remaining balance:
- Overpayments or underpayments you've made
- Rate changes between fixed deals, tracker periods, or SVR
- Payment holidays or arrears
- Early repayment charges (ERCs) or fees added to the balance
- Why does the calculator show interest paid as well as balance repaid?
- A repayment mortgage normally pays more interest than principal in the early years. The progress section helps show how much of your payment history has reduced the balance and how much has covered interest instead.
- What if I have a tracker, SVR, or variable rate?
- Most UK mortgages move through different rate periods, for example a 2 to 5 year fixed deal followed by the lender's standard variable rate (SVR). If your rate has changed, tick “Has your rate or payment changed?” and add each deal period. For a single rate, enter your current interest rate for a best estimate, but be aware that historical rate changes will affect the actual remaining balance. For a decision this size, it's worth speaking to an independent financial adviser or mortgage broker who can look at your full picture.
- What if I’ve made overpayments on my mortgage?
- Many lenders let you overpay by a set amount each year without an early repayment charge (ERC), often up to 10% of the outstanding balance. This calculator assumes regular monthly payments according to your schedule. If you've made overpayments, the actual remaining balance will be lower than the estimate shown. Check your latest annual mortgage statement for the exact figure.
- Can I use this to plan a remortgage?
- Knowing your estimated remaining balance helps you understand your loan-to-value (LTV) ratio, which affects the rates lenders will offer. Common lender bands are typically 60% and below, then 75%, 80%, 85%, and 90%. Lower LTVs usually unlock better rates. If you also know your property's approximate value, you can estimate which band you fall into and how close you are to the next. For a formal valuation, speak to your lender or a surveyor.
- Why is there no estimated repayment date for my mortgage?
- If the current monthly payment is too low to reduce the balance at the current interest rate, the calculator will not show an estimated repayment date because the balance would not reach zero under those assumptions. For a decision this size, it's worth speaking to an independent financial adviser or mortgage broker who can look at your full picture.
- What happens when my fixed deal ends?
- When a fixed-rate deal ends, most lenders move you onto their standard variable rate (SVR), which is usually higher. This means your monthly payment will increase unless you remortgage to a new deal. It's common to start looking for a new deal 3 to 6 months before your current one expires. Use the “Has your rate or payment changed?” toggle to model what happens if your rate moves to SVR.
Find out how much your monthly mortgage repayments will be based on the property price, mortgage length and your deposit amount.
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