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How to Calculate Your Remortgage LTV

Your loan-to-value ratio determines what rates you can access. This guide explains exactly how to calculate your LTV and what it means for your remortgage options.

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The LTV Formula — Step by Step

The LTV formula is: LTV (%) = (Outstanding mortgage balance / Property's current market value) x 100. That is the whole calculation. If your outstanding mortgage balance is £175,000 and your property is currently worth £250,000, your LTV is (175,000 / 250,000) x 100 = 70%.

Understanding what the result means is just as important as the calculation itself. An LTV of 70% means you are borrowing against 70% of your property's value, and you have 30% equity. In mortgage market terms, 70% LTV sits in the 75% LTV pricing tier — the tier that most lenders use to categorise your borrowing level, rounding up to the next standard threshold. This matters because rate pricing is applied at tier level, not at the exact LTV percentage.

The standard LTV tiers used by most lenders are: 60%, 65%, 70%, 75%, 80%, 85%, 90%, and 95%. Your actual LTV is rounded up to the nearest tier for pricing purposes. So an LTV of 72% places you in the 75% tier; an LTV of 76% places you in the 80% tier. Being just above a threshold is financially equivalent to being at the top of the next tier, which means small improvements in LTV — from 81% to 79%, for example — can unlock meaningfully better rates by moving you into the lower tier.

It is worth calculating both your current LTV and your LTV after any planned overpayments, to understand whether a targeted overpayment could push you below a pricing threshold before your remortgage application. This is a straightforward arithmetic exercise that can sometimes reveal a very cost-effective opportunity to improve your remortgage position with a relatively small lump sum payment.

How to Find Your Outstanding Mortgage Balance

Your outstanding mortgage balance is the amount you currently owe your lender. There are several ways to obtain this figure accurately. Your most recent annual mortgage statement will show the balance as of the statement date. Most lenders also provide online account access where your current outstanding balance is displayed, updated daily or after each payment is processed. If you do not have online access, calling your lender's customer service line will produce an accurate figure within minutes.

It is important to use your current balance rather than the original loan amount. Your balance will have reduced since origination through capital repayments — on a repayment mortgage — and may also differ due to any overpayments you have made. Using an outdated figure will produce an inaccurate LTV calculation and may lead you to approach lenders in the wrong tier.

If you have a flexible or offset mortgage with an overpayment facility, your balance may fluctuate depending on whether you have drawn back any overpayments you previously made. Confirm the actual outstanding balance — not the original balance or a historic figure — before beginning your LTV calculation.

Some borrowers have multiple charges on their property — a first charge mortgage and a secured loan or second charge mortgage. If this applies to you, the combined outstanding balance of all secured borrowings should be used in your LTV calculation, as this is how lenders will assess your combined borrowing against the property's value. Your LTV for remortgage purposes is calculated on total secured borrowing, not just the first mortgage.

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How to Find Your Property's Current Market Value

Estimating your property's current market value is less straightforward than finding your mortgage balance, but there are reliable approaches at different levels of precision and cost. The most accessible starting point is an online automated valuation model (AVM). Platforms such as Rightmove, Zoopla, Nationwide's house price calculator, and specialist AVM providers use algorithms based on Land Registry sold prices and other data to estimate property values. These tools are free, instant, and accurate enough for initial planning purposes — though they should be treated as estimates rather than definitive values.

A more precise approach is to review recent comparable sales in your immediate area. The Land Registry publishes sales data with a delay of one to two months, and this data is accessible through the Land Registry's price paid search tool and property portals. Looking at properties similar in size, type, and condition to your own that have sold in the last six to twelve months gives a more grounded estimate than an AVM alone, particularly if your property has unusual features or the local market has moved significantly.

For the most accurate pre-application estimate, particularly where the outcome is finely balanced around a pricing threshold, commissioning a RICS-qualified surveyor to carry out a brief market appraisal or desktop valuation can be worthwhile. This costs money — typically £100-300 — but gives you a professionally assessed estimate that is closest to what a lender's valuation is likely to produce.

It is essential to remember that the lender will conduct their own valuation as part of the remortgage application, and it is this valuation — not your estimate — that will be used to calculate the LTV for rate-banding and product selection. If the lender's valuation comes in lower than you expected, your LTV will be higher, potentially placing you in a less favourable tier. Being conservative in your initial estimate — using the lower end of a range rather than the optimistic end — reduces the risk of an unexpected tier change at application stage.

What Your LTV Means for Remortgage Rates and Options

Once you have calculated your LTV, you can assess which tier of the mortgage market you are in and what rate premiums apply. As a general orientation: below 60% LTV is the best rate tier, 60–75% LTV is the competitive mainstream market, 75–80% LTV is still mainstream but with some additional cost, 80–85% LTV starts to narrow the lender range, 85–90% LTV is specialist territory with meaningful rate premiums, and above 90% LTV is the upper end of the specialist market.

Rate pricing across these tiers varies by market conditions and the specific lender, but a rough rule of thumb is that each tier step upward adds approximately 0.2–0.4 percentage points to the available rate. Moving from 75% to 85% LTV therefore adds approximately 0.4–0.8 percentage points to the rate, and moving from 75% to 95% LTV adds approximately 1.5–2.0 percentage points. On a £200,000 mortgage, those differences translate to £800–£4,000 per year in additional interest costs.

Beyond rate pricing, your LTV also affects lender eligibility, product type availability, and criteria flexibility. At lower LTV bands, more lenders are willing to consider complex income situations, adverse credit history, non-standard property types, and other factors that restrict lender choice at higher LTV levels. Understanding this interaction — between your LTV and any other complexity in your application — is important for assessing the full range of options realistically available to you.

Finally, your LTV is not static. Property values move, capital repayments reduce your balance, and overpayments can accelerate both effects. If you are close to a tier boundary today, calculate what level of overpayment or property value increase would push you below the boundary, and consider whether the rate improvement that would follow makes that move financially worthwhile. A broker can model this precisely for your circumstances, factoring in the cost of any overpayment against the rate saving and its payback period.

Important: Your home may be repossessed if you do not keep up repayments on your mortgage. There will be a fee for mortgage advice. The actual rate available will depend on your circumstances. Think carefully before securing other debts against your home.

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Frequently Asked Questions

Loan-to-value (LTV) is a ratio that expresses your outstanding mortgage balance as a percentage of your property's current market value. A 75% LTV means you owe 75% of your property's value and own 25% outright as equity. LTV is the primary variable that determines what mortgage rates and products are available to you — lower LTV means lower rates and more lender options.

Divide your outstanding mortgage balance by your property's current market value, then multiply by 100 to express it as a percentage. For example: outstanding balance of £160,000 divided by property value of £200,000, multiplied by 100 = 80% LTV. You need an accurate current balance from your lender and a realistic estimate of your property's current value, which can come from online valuation tools or a professional survey.

For a remortgage, lenders use your property's current market value — not the original purchase price. If your property has increased in value since purchase, your LTV will be lower than when you originally borrowed, which works in your favour. If values have fallen, your LTV will be higher. The lender will commission their own valuation as part of the application, and this figure is used to set your LTV for rate banding and product eligibility purposes.

The best remortgage rates are consistently available at 60% LTV and below — corresponding to 40% equity or more. Some lenders offer slightly enhanced rates at 50% LTV and below, but the improvement at these very low LTV levels is marginal. Moving from 75% LTV to 60% LTV typically produces a meaningful rate improvement, while moving from 60% LTV to 50% LTV produces a smaller incremental improvement.

Yes. Making overpayments on your current mortgage directly reduces the outstanding balance and improves your LTV. Most mortgages allow overpayments of up to 10% of the outstanding balance per year without penalty. If your property has recently increased in value, you may also find your LTV is already better than you realised once you get an up-to-date valuation. A combination of capital repayments, targeted overpayments, and an accurate current valuation can sometimes reveal a significantly better LTV position than expected.

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