Property Equity Calculator
Enter what you paid, when, and where. The calculator applies the official regional House Price Index movement to your purchase price, takes off your mortgage balance, and shows the equity and loan-to-value that leaves.
What this calculator assumes
- The estimate is your purchase price multiplied by the change in the average price for your region between the year you bought and the latest published month. Nothing about your individual property enters the calculation.
- Regional figures come from the UK House Price Index, which is built from registered sale completions rather than asking prices. The latest month in this dataset is June 2026.
- The starting figure is the average across the whole of your purchase year, because you tell the calculator a year rather than a month. The ending figure is the single latest published month.
- A region is a very large area containing flats, terraces and detached houses in neighbourhoods that move at different speeds. One average movement is applied to all of them.
- The index cannot see extensions, conversions, renovations, condition, your street or your outlook. If your property has materially changed since you bought it, override the estimate.
- This is not a valuation. It is not suitable for a sale, a mortgage application, probate, inheritance tax or any legal purpose — those need a valuation from an appropriately qualified professional.
- Mortgage balance is whatever you type. It is not read from a lender and does not update on its own.
- Nothing you type leaves your browser. There is no account, no sign-up and no data stored.
Contains HM Land Registry data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0. Regional average prices are taken from the UK House Price Index, produced by HM Land Registry with Registers of Scotland, Land and Property Services Northern Ireland and the Office for National Statistics. Data as at the June 2026 release. earmarkIQ is not affiliated with, endorsed by, or acting on behalf of any of these bodies, and the estimate is earmarkIQ’s own calculation.
How the estimate is worked out
The method is indexation, and it is deliberately reproducible. Take the price you paid. Look up the average price for your region in the year you bought, and again for the most recent published month. Multiply your purchase price by the ratio between the two. That is the whole calculation, and you could run it yourself on a calculator with the published figures.
That is growth of £46,650, or 17.6% across seven years — an annualised 2.34%. The loan-to-value falls to 53.9%, which matters more than the headline value if you are approaching the end of a fixed rate, because lenders price in bands and crossing below 60% or 75% can change what you are offered.
Notice how modest the annualised figure is. Regional averages over a specific seven-year window rarely produce the numbers people expect from headlines about the housing market, and the South East in particular has been close to flat in cash terms since 2022. Choosing a different region changes the answer substantially: the same purchase in the North West would have moved by a factor of 1.44 over the same period, and in London by 1.10.
What an indexed estimate can and cannot tell you
The estimate answers one question well: how has the market in my region moved since I bought? It does not answer what would my house sell for? Those are different questions and the gap between them is worth stating plainly.
A region contains an enormous variety of property. Terraces and new-build flats and detached houses in dozens of towns are all averaged into one number, and your street is not the average street. If your area has run ahead of the region, the estimate understates. If a large new-build development has pulled the regional average up, an older property may be overstated.
The index also has no record of your property specifically. The extension, the loft conversion, the new roof, the rewiring, the damp in the back bedroom: none of it is an input. The only property-specific fact in the sum is a purchase price from years ago, which described a house that may no longer exist in that form.
Finally, there is timing. The index is compiled from registered completions, so it is published with a lag of roughly two months, and recent months are revised as further sales are registered. That is a property of the official statistic rather than a defect in this calculator.
There is a fuller treatment of the method, including how it differs from an automated valuation model, in how earmarkIQ values your property, and of the feature itself on the property and equity page.
Why equity is the number that matters
A property value on its own is not much use for planning. What you are worth is the value less the debt secured against it, and equity grows from two directions at once: the balance falls every month as you repay, which is certain, and the estimated value moves with the index, which is not.
Keeping those two apart is worth the effort. The repayment half is real money you have committed and cannot lose. The index half is an estimate that can go backwards — and did, across most of the UK, in parts of 2023 and 2024. Someone whose net worth rose entirely because a regional average moved has not become more able to pay a bill this month, because equity is not spendable without selling, remortgaging or borrowing against the property.
Loan-to-value is the practical output. It determines which mortgage products you qualify for, and because lenders price in bands, watching it approach 80%, 75% or 60% gives you a reason to get a proper valuation before your fixed rate ends. Use the mortgage affordability calculator if you are working the other way round and want to know what you could borrow.
Frequently asked questions
Other calculators
Keeping this up to date without re-typing it
The figures above are a snapshot. In earmarkIQ the same calculation runs on its own: add your address once, and the estimate refreshes each month as new index data is published, with your mortgage balance beside it and the resulting equity feeding into your net worth alongside your accounts, investments and debts. You can override the estimate at any time.