The UK Mortgage Calculator is mainly intended for United Kingdom residents using the British Pound currency.
Modify the values and click the calculate button to use
This calculator is made for UK buyers, using sterling and the lending conventions that apply across England, Scotland, Wales, and Northern Ireland. You enter the property price, your deposit, an interest rate, and the mortgage term, and it returns your monthly repayment, your loan-to-value (LTV) ratio, and an estimate of borrowing capacity based on income. A UK mortgage is usually a capital-and-interest (repayment) loan over 25 to 35 years, priced against fixed or tracker deals tied to the Bank of England base rate. The calculator highlights your LTV because it directly determines which interest rates lenders will offer — a 90% LTV deal costs more than a 75% one. It also notes that stamp duty land tax applies above certain thresholds. Use it to budget repayments, test deposits, or gauge affordability before applying.
You can produce a UK repayment estimate in under two minutes. Follow these steps:
Enter the property price.
Use the asking price or your offer in pounds.
Add your deposit.
A typical first-time-buyer deposit is 10%, though 5% deals exist; a larger deposit lowers your LTV and unlocks better rates.
Input the interest rate.
Enter your quoted rate or a current market figure; UK fixed rates sat in the mid-4% range in 2026.
Choose your term.
UK mortgages commonly run 25 to 35 years; a longer term lowers monthly payments but raises total interest.
Add your annual income (optional).
This lets the tool estimate borrowing at roughly 4.5 times salary.
Review your figures.
See your monthly repayment, LTV, and estimated maximum borrowing.
Increase your deposit and watch your LTV drop into a cheaper rate band — that's where real savings hide.
The core repayment uses the standard amortisation formula, the same maths UK lenders apply to a capital-and-interest mortgage. In plain terms, it spreads your loan plus interest evenly across every month of the term:
Monthly Repayment = Loan Amount amortised at your rate over the term (in months)
Your loan is simply the property price minus your deposit. The calculator also works out your loan-to-value, which lenders care about deeply:
LTV = (Loan Amount ÷ Property Price) × 100
A £250,000 home with a £50,000 deposit means a £200,000 loan and an 80% LTV. For borrowing capacity, it applies the common income multiple:
Maximum Borrowing ≈ Annual Income × 4.5
Here's what that actually means: LTV isn't just a number, it's the gatekeeper to your interest rate. Drop from 85% to 80% LTV and lenders typically offer a lower rate, which shrinks your monthly repayment twice over — smaller loan, cheaper rate. The income multiple is a guideline; lenders also assess your spending, debts, and credit before confirming what they'll actually lend.
Your monthly repayment is the headline, but the LTV figure quietly shapes everything around it. Lenders price mortgages in LTV bands, so an 89% LTV and a 90% LTV can mean meaningfully different rates — nudging your deposit over a band threshold is one of the easiest ways to save. The borrowing estimate based on 4.5 times income is a ceiling set by affordability rules, not a target; most buyers are more comfortable borrowing below it. If you're on a fixed deal, remember the rate only lasts the fixed period, often two or five years, after which you'll move to the lender's higher standard variable rate unless you remortgage. That's the moment many UK homeowners feel a payment jump. Stamp duty sits outside your monthly figure but hits at completion, so factor it into your upfront cash alongside the deposit. Read your result as a starting point for conversations with a broker, who can match your LTV to live deals.
Several distinctly British factors move your repayment and what you can borrow:
A bigger deposit drops your LTV into a lower band, unlocking cheaper rates. Crossing 90%, 85%, 80%, or 75% matters.
Fixed deals lock your rate for a set period; trackers follow the Bank of England base rate and can rise or fall.
Stretching to 35 or 40 years cuts the monthly cost but adds substantial interest over time.
Lenders apply roughly a 4.5x income cap, then stress-test your budget against higher rates.
This upfront tax scales with price and isn't part of your monthly payment, but it's real cash you'll need.
Existing commitments reduce how much a lender will offer regardless of the income multiple.
Sophie buys a £220,000 flat with a 10% deposit of £22,000, leaving a £198,000 loan at 90% LTV. On a five-year fixed deal at 4.6% over 30 years, her monthly repayment is about £1,015. If she could stretch her deposit to £33,000 (15%), her LTV would fall to 85%, likely unlocking a rate nearer 4.3% and trimming the payment to roughly £980 — a smaller loan and a cheaper band working together. On her £45,000 salary, the 4.5x guideline caps borrowing near £202,500, so her loan just fits.
James and Priya sell up and buy a £400,000 house, putting down £100,000 (25%) for a £300,000 loan at 75% LTV. That low LTV earns a sharper rate of 4.2% on a five-year fix over 25 years, giving a monthly repayment of about £1,618. Their combined income of £80,000 supports borrowing up to roughly £360,000 at 4.5x, so affordability is comfortable. They'll also owe stamp duty on the £400,000 purchase, a sum they've set aside separately from the deposit.
A few UK-specific moves can save you real money:
Chase the next LTV band. A slightly bigger deposit that drops you from 85% to 80% LTV can cut your rate and your repayment noticeably.
Diarise your fixed-rate end date. Start shopping for a remortgage months before your deal ends to dodge the standard variable rate.
Budget stamp duty separately. It's upfront cash on completion, not part of your monthly repayment, so don't let it blindside you.
Consider overpayments. Many UK deals allow 10% annual overpayments penalty-free, cutting your term and total interest.
Get an Agreement in Principle. It confirms what a lender will actually offer before you make offers.
Compare fixed against tracker. Fixed gives certainty; a tracker can be cheaper if base rates fall, so weigh your appetite for risk.
UK lenders typically lend up to around 4.5 times your annual income, though some go to 5 or 5.5 times for certain borrowers. On a £45,000 salary, that's roughly £202,500. Lenders also assess your spending and debts before confirming the figure.
A UK mortgage calculator amortises your loan — the property price minus your deposit — at your interest rate over the full term in months. This spreads capital and interest into equal monthly payments. A longer term lowers the monthly amount but increases total interest paid.
Most UK lenders require at least a 5% deposit, though 10% or more unlocks better interest rates. A larger deposit lowers your loan-to-value, which sits in bands that determine your rate. Aiming for 85% LTV or lower noticeably improves the deals available.
Loan-to-value is your loan as a percentage of the property price, so a £200,000 loan on a £250,000 home is 80% LTV. Lenders price mortgages in LTV bands, meaning a lower LTV usually earns a cheaper rate. Dropping below a band threshold can reduce your monthly repayment.
When your fixed period ends, you automatically move onto the lender's standard variable rate, which is usually higher. Most borrowers remortgage to a new deal before that happens to avoid the jump. Starting the search a few months early gives you time to switch smoothly.
A repayment mortgage pays off both capital and interest so you own the home outright at the end, while interest-only covers just the interest with the full balance still owed at term's end. Most residential UK mortgages are repayment. Interest-only is now mainly used for buy-to-let.
This mortgage calculator UK focuses on your monthly repayment, LTV, and borrowing capacity, and flags that stamp duty applies above set thresholds. Stamp duty is an upfront tax paid at completion, separate from your monthly payment. Budget for it alongside your deposit.
Brief disclaimer: This calculator provides estimates for educational and planning purposes only. Actual mortgage terms, rates, and borrowing amounts depend on your lender, credit profile, and full financial assessment. Stamp duty figures referenced reflect current UK thresholds and may change. Results should be treated as planning guidance rather than financial or mortgage advice.