Calculate your Stamp Duty based on property location and buyer status.
An offset account reduces the mortgage balance on which interest is calculated.
Make extra payments to reduce your mortgage term and total interest paid.
UK Mortgage Calculator - Monthly Repayments, Stamp Duty and Fees Updated Mar 2026
Calculate your UK mortgage in minutes
Check monthly repayments, compare repayment and interest-only options, and test the effect of deposit size, fees, overpayments, offset savings, and UK property tax rules. Free, instant results with no signup required.
Use UK Mortgage Calculator NowKey Takeaways
- The monthly payment is only part of the story: Product fees, stamp duty, buildings insurance, service charges, and council tax can change the real cost quickly.
- LTV bands matter: Moving from 95% to 90%, 85%, 80%, 75%, or 60% may change the deals you may qualify for.
- Repayment and interest-only do very different jobs: One clears the balance over time, while the other leaves the capital to repay later.
- The end of a fixed deal can be a budget shock: Many borrowers move to a higher follow-on rate if they do not review their options in time.
- Overpayments may be powerful: You can test that with our mortgage payoff calculator and amortization calculator.
What Is a UK Mortgage Calculator?
A UK mortgage calculator estimates your monthly home loan cost using the property price, deposit, rate, term, and key UK costs such as product fees or purchase tax. It helps you compare deals in plain language before you speak to a lender, broker, solicitor, or conveyancer.
The best UK mortgage calculator is not only about one monthly number. It also helps you test repayment versus interest-only, fixed versus tracker, higher or lower deposits, overpayments, offset savings, and the difference between England and Northern Ireland SDLT, Scotland LBTT, and Wales LTT.
What this calculator helps you check
- Basic monthly repayment: The core home loan payment based on the loan size, rate, and term.
- Mortgage type trade-offs: The gap between repayment, interest-only, fixed, tracker, SVR, and offset setups.
- Deposit and LTV effect: Whether a larger deposit may move you into a different pricing band.
- Real buying costs: Product fees, stamp duty, and other costs that many quick calculators leave out.
- What-if planning: Overpayments, remortgage timing, and rate changes before your current deal ends.
This matters because many UK mortgage pages split the decision into separate tools. One page may show only repayments, another may show affordability, and another may cover tax. Your calculator already supports stamp duty, repayment and interest-only options, offset savings, overpayments, and a full payment schedule, so this guide is built to explain the whole decision in one place.
Why old examples can mislead you
A lot of borrowers still compare today's mortgage quotes with very low rates from earlier years. On 5 February 2026, the Bank of England said Bank Rate was 3.75% and inflation was 3%, but that does not mean every mortgage deal is 3.75% or that lender pricing will move in a straight line.
That is why this article uses current rule context and simple examples, not one blanket rate claim. Your own quote may still vary by LTV, product fee, credit history, property type, and lender policy.
How to Use This Calculator
Most people use a mortgage calculator for one of three reasons: to check if a home looks affordable, to compare two or three deals, or to see how much a higher deposit or overpayment may change the result. The fastest way to get a useful answer is to start with a realistic deal, not a best-case headline rate.
- Step 1: Enter the home price - Add the property price you want to test, not just the listing that looks good at first glance.
- Step 2: Add your deposit - Use the cash you can really put down because LTV bands often change the deals you may see.
- Step 3: Choose the mortgage type - Switch between repayment and interest-only if you want to compare a full payoff with a lower monthly bill.
- Step 4: Set the rate and term - Try a realistic deal rate and test 25, 30, or 35 years to see how the monthly cost moves.
- Step 5: Include tax and fees - Check stamp duty, product fees, and other buying costs so the result feels closer to real life.
- Step 6: Test overpayments or offset savings - Run extra payment or offset examples to see if you may cut interest or finish earlier.
- Step 7: Compare before you apply - Save a few scenarios before you talk to a lender, broker, solicitor, or conveyancer.
After you run the first version, test at least two more. A good second run is a lower deposit with a higher rate, and a good third run is the same loan with a shorter term or a small overpayment. If you are buying in England, Scotland, or Wales, also compare the result with our stamp duty calculator so your cash-to-buy number does not stop at the mortgage itself.
Simple setup that gives a more realistic answer
Try the property price, your actual deposit, the rate your broker or lender has discussed, and the term you are genuinely willing to live with. Then add the product fee, likely tax, and any monthly service charge if the home is leasehold or in a managed block.
If you want to check how the deal feels after payday, compare it with our UK income tax calculator and council tax calculator.
UK Mortgage Calculator Formula Explained
A repayment mortgage uses the standard amortising loan formula. An interest-only mortgage is simpler because the monthly payment only covers the interest, not the balance itself.
Interest-only mortgage: Monthly payment = P x annual rate / 12
In plain words, P is the loan amount, r is the monthly rate, and n is the number of monthly payments. The monthly rate is usually the yearly rate divided by 12 for a planning example.
Worked example with real numbers
Assume a property price of £300,000, a 10% deposit of £30,000, and a loan of £270,000. At 5.25% over 25 years, the repayment mortgage works out at about £1,618 per month.
That is the home loan payment only. Your true moving budget may still need to include stamp duty, legal fees, buildings insurance, moving costs, and in some cases council tax or service charges right from the start.
If you would rather look at the loan month by month, use our amortization calculator. If you want to see whether extra payments may help more than a small rate change, use our mortgage payoff calculator.
Why lender figures can differ slightly
Real lender systems can use specific payment dates, daily interest methods, fee treatment, and product rules that create a small gap versus a planning calculator. That does not make the calculator useless. It means you should treat it as a strong estimate rather than a formal offer.
Types of UK Mortgages
The word "mortgage" hides several very different products. If you only compare the headline monthly payment, you may miss the biggest risk in the deal.
- Repayment mortgage
- This is the common choice for people who want the loan balance to fall over time. The monthly payment is higher than interest-only, but it is designed to clear the debt by the end of the term if payments stay on track.
- Interest-only mortgage
- This keeps the monthly payment lower because you only cover interest during the term. It may suit some buy-to-let or specialist plans, but you still need a clear way to repay the capital later.
- Fixed-rate mortgage
- The rate stays the same for a set period, often two, three, five, or ten years. This can make budgeting easier, but the payment may jump if the deal ends and you move onto a higher follow-on rate.
- Tracker mortgage
- The rate moves with an external reference, often linked to Bank Rate. A tracker can fall when the market falls, but it can also rise while you hold it.
- Standard variable rate
- SVR is often what borrowers roll onto after a fixed or tracker deal ends. It can offer flexibility, but it is often not the cheapest place to stay for long.
- Offset mortgage
- An offset links eligible savings to the mortgage balance so interest is charged on a lower effective amount. It may suit households with a strong cash buffer who still want mortgage flexibility.
| Type | What the monthly cost may look like | May suit | Main watch-out |
|---|---|---|---|
| Repayment | About £1,754 on a £300,000 loan at 5% over 25 years | Most owner-occupiers who want the loan gone by the end of the term | Higher monthly cost than interest-only |
| Interest-only | About £1,250 on the same loan and rate | Borrowers with a separate and credible repayment plan | You still owe the full capital later |
| Fixed rate | Stable during the deal period | People who want budget certainty | Can include ERCs if you leave early |
| Tracker | Can rise or fall with the market | Borrowers who accept payment movement | Rate risk if the market turns up |
| SVR | Often higher after a deal ends | Short stop-gap use | Easy to overpay, but not always cheap to stay |
| Offset | Interest can fall if linked savings stay high | Households with good cash reserves | The headline rate is not always the lowest |
If you are comparing deals with very different fees, try our mortgage points calculator as well. It is a quick way to see when a lower rate stops being a bargain once the fee is included.
UK Mortgage Calculator vs Affordability Calculator: Key Differences
A mortgage calculator and an affordability calculator answer related but different questions. One tells you what a given loan may cost. The other asks how much borrowing might fit your income and spending.
| Tool | Main question | Key inputs | Best use |
|---|---|---|---|
| UK mortgage calculator | What may this home loan cost each month? | Property price, deposit, rate, term, mortgage type, tax, fees | Deal comparison, overpayment planning, remortgage planning |
| Affordability calculator | How much borrowing may fit my income and outgoings? | Income, debts, bills, childcare, credit profile, household spend | Setting a safer price range before you start viewing homes |
| Budget tools | What can I really carry after tax and bills? | Take-home pay, council tax, other debts, savings goals | Stress-testing the mortgage against normal life costs |
In practice, most buyers need all three views. Start with a rough price range, then test the likely payment here, then compare the result against take-home pay and regular bills. Our UK income tax calculator, council tax calculator, and down payment calculator are useful for that second pass.
Easy trap to avoid
Many buyers focus only on the maximum borrowing number because it feels like the main gate. That number is not your comfort limit. Your safer target may be lower once you add council tax, insurance, service charges, commuting, childcare, and the chance that rates move when the fixed deal ends.
How Much Does a UK Mortgage Cost Per Month?
The monthly cost of a UK mortgage changes fast with the rate, term, deposit, and fees. On a £250,000 repayment mortgage over 25 years, the payment is about £1,320 at 4%, £1,461 at 5%, £1,611 at 6%, and £1,767 at 7%, before council tax, insurance, and service charges.
| Rate | Monthly repayment | Total interest over 25 years | Change vs 5% |
|---|---|---|---|
| 4.0% | £1,320 | £145,878 | -£142 |
| 5.0% | £1,461 | £188,443 | Base case |
| 6.0% | £1,611 | £233,226 | +£149 |
| 7.0% | £1,767 | £280,084 | +£305 |
The deposit matters too because LTV bands can change which products you may see. On a £350,000 home, these are the cash amounts needed to reach common LTV levels:
| LTV | Deposit needed | Loan size | What it often means |
|---|---|---|---|
| 95% | £17,500 | £332,500 | Often a smaller deposit, but choice may be tighter. |
| 90% | £35,000 | £315,000 | Often a smaller deposit, but choice may be tighter. |
| 85% | £52,500 | £297,500 | A common middle band for mainstream products. |
| 80% | £70,000 | £280,000 | A common middle band for mainstream products. |
| 75% | £87,500 | £262,500 | A common middle band for mainstream products. |
| 60% | £140,000 | £210,000 | Often where the broadest choice may appear. |
Historical context that helps
One reason this topic is hard is that rate memories stick around. Many people still compare current offers with the very low mortgage deals seen in earlier years, but the UK market has changed. That is why a current payment table is often more useful than an old article headline.
Mortgage Rules by Country
This calculator is built for UK mortgage decisions, but cross-country comparisons still help because many readers have worked abroad, compare overseas articles, or see US mortgage content in search results. The main lesson is simple: the structure of a mortgage is not identical everywhere, so the right calculator depends on the country rules.
| Country | Common mortgage pattern | Costs outside the base payment | What matters most |
|---|---|---|---|
| USA | 30-year fixed loans are very common in guides and calculators | Property tax, insurance, HOA fees, and mortgage insurance are often central | Do not copy US payment examples into a UK budget without adjusting the structure |
| UK | Repayment and interest-only, with fixed, tracker, SVR, and offset choices | Product fees, SDLT or devolved tax, legal costs, insurance, service charges | LTV bands and deal-end planning matter a lot |
| Canada | Shorter fixed periods and stress-tested affordability are common themes | Provincial taxes and closing costs vary | Rate renewal risk can be a bigger discussion point |
| Australia | Variable, fixed, offset, and redraw features often get more attention | Stamp duty and state-based rules can shift the total cost | Offset value can be a major differentiator |
| India | Floating-rate loans and longer tenures are common reference points | Registration, tax rules, and lender processing costs vary | Loan tenure and floating-rate risk often drive the decision |
USA
US mortgage content often puts a 30-year fixed loan at the centre of the page and adds property tax, homeowners insurance, HOA fees, and mortgage insurance into the monthly number. That is useful for US readers, but it can make UK borrowers think the structure is identical when it is not.
If you are comparing a UK purchase with a US guide, the main difference is not just the currency. It is also the deal structure, the purchase-tax system, and the way rate changes show up after an introductory period. For a more general cross-market home loan view, see our mortgage calculator.
UK
The UK market is more product-led than many generic guides suggest. Your deposit, LTV band, mortgage type, product fee, and what happens when the deal ends can all matter as much as the starting rate itself.
There is also a tax split inside the UK. England and Northern Ireland use SDLT, Scotland uses LBTT, and Wales uses LTT. If you move from one nation to another, you should not assume the purchase-tax rules follow you.
Canada
Canadian mortgage planning often pays more attention to renewal risk and stress-tested affordability. If you are a UK reader who keeps seeing Canadian content in search or social feeds, treat it as background education rather than a direct cost guide for a UK purchase.
Australia
Australian mortgage comparisons often talk more about offset and redraw features, which is useful if you are also considering an offset mortgage in the UK. The idea is similar, but the exact product rules and tax treatment are not identical.
India
Indian mortgage guides often focus on floating-rate movement and long terms. That makes them useful for understanding rate risk, but a UK borrower still needs UK tax, fee, and lender rules before making a real decision.
Common Mortgage Mistakes to Avoid
Many expensive mortgage mistakes do not come from bad maths. They come from comparing the wrong number, skipping the wrong fee, or assuming the future deal will work like the current one.
1. Comparing the rate but ignoring the fee
A lower rate does not always mean a cheaper deal. On a £250,000 balance over 25 years, a 4.85% deal with a £1,499 fee is only about £29 a month cheaper than a 5.05% no-fee deal.
That means the fee takes about 52 months to win back. If you expect to move or remortgage again before that, the no-fee deal may make more sense.
2. Forgetting what happens after the fixed deal ends
Many people budget off the headline fixed rate and stop there. If your deal ends and you roll onto a higher follow-on rate, the monthly cost can jump quickly.
Even a 1% rate rise can be material. On a £250,000 repayment mortgage over 25 years, the difference between 5% and 6% is about £149 a month.
3. Stretching the term without checking the total interest
A longer term can rescue the monthly budget, but it can also make the full cost much bigger. On a £280,000 loan at 5.1%, the payment is about £1,653 over 25 years and about £1,431 over 35 years.
The longer term is about £222 a month cheaper, but it adds roughly £105,072 in extra interest if the loan stays unchanged for the full term.
4. Skipping stamp duty or devolved purchase tax
Your deposit is not the whole cash need. England and Northern Ireland SDLT, Scotland LBTT, and Wales LTT can add a meaningful extra cost on completion day, especially if you already own another home or lose first-time buyer relief.
5. Ignoring service charges, ground rent, or buildings insurance
Leasehold flats, managed buildings, and some shared ownership setups can add regular costs that reduce affordability even when the loan size stays the same. A cheaper mortgage payment does not help much if the building costs eat the gap.
6. Assuming all overpayments are free
Overpayments can be a smart move, but many deals still have rules around how much you can pay early without an ERC. Always check the lender terms before you plan around a big annual payment or a bonus.
7. Letting old low-rate headlines shape a 2026 decision
One common psychology trap is treating older ultra-low rates as the "normal" baseline and current payments as temporary noise. That can lead buyers to underestimate the monthly bill they need to be able to carry now, not in a different rate cycle.
Quick pre-application checklist
Before you move from planning to application, check the rate, the product fee, the ERC, the likely LTV band after valuation, and the full monthly housing budget after council tax and insurance. That five-minute check can save much more than most people expect.
Tax and Legal Considerations
UK purchase tax is one of the easiest places to make a budgeting mistake because the rules change by nation. The key point is simple: England and Northern Ireland, Scotland, and Wales do not use the same home purchase tax system.
England and Northern Ireland
GOV.UK says SDLT starts to apply to residential property above £125,000. First-time buyers may get 0% up to £300,000 on homes up to £500,000, and additional residential properties usually attract a 5% surcharge on top of the normal rates.
GOV.UK also says the SDLT return and payment are normally due within 14 days of completion. If your solicitor or conveyancer handles this for you, the tax is usually rolled into the money you send before completion.
Scotland
Revenue Scotland says LBTT replaced SDLT in Scotland from 1 April 2015. For residential property, the main starting threshold is £145,000, and first-time buyer relief raises the nil-rate band to £175,000.
Scotland also has Additional Dwelling Supplement rules for extra homes. If you are buying in Scotland, use the Scotland-specific tax view instead of carrying England-only numbers into the budget.
Wales
GOV.WALES says LTT replaced SDLT in Wales from 1 April 2018. The current main residential threshold is £225,000, and Wales does not have a general first-time buyer relief that mirrors England or Scotland.
GOV.WALES also says LTT returns and payment are due within 30 days of the day after completion. Higher residential rates may apply if you already own one or more properties unless you are replacing your main residence and meet the local rules.
| Nation | Purchase tax | Main threshold | First-time buyer note |
|---|---|---|---|
| England and Northern Ireland | SDLT | £125,000 | 0% up to £300,000 on homes up to £500,000 |
| Scotland | LBTT | £145,000 | Nil-rate band rises to £175,000 |
| Wales | LTT | £225,000 | No general first-time buyer relief like England or Scotland |
Legal costs matter too. Product fees, valuation fees, legal fees, survey costs, leasehold checks, and early repayment charges may all affect the best deal choice. For personal tax position or legal interpretation, it is wise to speak with a qualified professional before you treat a calculator result as a final answer.
Mortgage Strategies by Life Stage
The right mortgage setup can change as your income, family size, and time horizon change. These are planning ideas, not personal advice, but they can help you ask better questions.
In your 20s
Many buyers in their 20s are balancing a smaller deposit against rising rent and moving costs. A longer term may help with monthly budget pressure, but it is worth checking whether regular overpayments later could shorten the term once income improves.
If you are still building the deposit, compare your plan with our Lifetime ISA calculator. If you already hold one, our Help to Buy ISA calculator can still help you estimate how the bonus may support a purchase.
In your 30s
This is often the decade when space, schools, childcare, and commuting all start to matter at once. A slightly cheaper rate is not always the best answer if the product carries a fee you are unlikely to win back or if the payment leaves too little room for family costs.
In your 40s
Borrowers in their 40s often think more about remortgaging, overpayments, and how long the loan will run into later life. This is a good stage to compare the cost of a shorter term versus the flexibility of a slightly longer one with planned overpayments.
In your 50s
Many buyers or remortgagers in their 50s start checking how the mortgage fits with retirement timing. A lender may look more closely at income beyond a certain age, so it helps to test both the monthly payment and the realistic exit plan.
In your 60s and beyond
Later-life borrowing may still be possible, but product choice and lender rules can narrow. If your case is complex, or if the mortgage runs into retirement, professional advice becomes even more important because the affordability discussion can change.
Life-stage reminder
Your best mortgage strategy depends on more than age. Income stability, other debts, family needs, pension plans, and how long you expect to stay in the home all matter, so treat these examples as a planning frame rather than a rule.
Real Mortgage Scenarios
Worked examples make trade-offs easier to spot. The numbers below are illustrations built from the standard loan formula, so your lender may show slightly different figures once product rules and dates are finalised.
Scenario 1: First-time buyer in England
Home price: £300,000. Deposit: £30,000. Loan: £270,000. Rate: 5.25%. Term: 25 years.
Estimated monthly repayment: £1,618. If this is your first home in England and the price is £300,000, SDLT may be zero under the current first-time buyer rule, but legal fees, survey costs, and moving costs still need to be budgeted.
Scenario 2: Remortgage fee trade-off
Loan balance: £250,000. Time left: 25 years. Deal A: 4.85% with a £1,499 fee. Deal B: 5.05% with no fee.
Estimated monthly repayment: about £1,440 for Deal A versus about £1,469 for Deal B. The lower-rate fee deal takes about 52 months to win back the fee, so it may not be the cheaper choice if you expect to move or remortgage again sooner.
Scenario 3: 25-year term or 35-year term?
Loan: £280,000. Rate: 5.1%.
25 years: about £1,653 a month. 35 years: about £1,431 a month. The longer term lowers the monthly bill by about £222, but it may add about £105,072 in total interest if nothing else changes.
Scenario 4: Small overpayment, big term effect
Loan: £250,000. Rate: 5%. Term: 30 years. Base monthly repayment: about £1,342.
If you add £150 a month and your lender allows it, the term may drop by about 6 years, and total interest may fall by roughly £53,322.
Scenario 5: Interest-only reality check
Loan: £300,000. Rate: 5%. Term: 25 years.
Repayment mortgage: about £1,754 a month. Interest-only mortgage: about £1,250 a month. The saving looks attractive, but the full £300,000 capital is still waiting at the end, so the repayment plan matters as much as the payment itself.
Frequently Asked Questions
About This Calculator
Calculator name: UK Mortgage Calculator
Category: Mortgage
Created by: CalculatorZone Mortgage Editors
Updated: Mar 2026
Methodology: This page uses the standard repayment mortgage formula for amortising loans and a simple monthly interest method for interest-only examples. It is designed to explain the calculator feature set in plain language, including repayment versus interest-only, offset savings, overpayments, and UK purchase tax context.
Data source approach: Market context is checked against official or public-interest sources such as the Bank of England, MoneyHelper, GOV.UK, Revenue Scotland, and GOV.WALES. Rates, tax bands, and scheme details can change, so always confirm live numbers before you commit to a property or a mortgage product.
How to use it well: Run at least two or three scenarios, then compare the result with your likely take-home pay, council tax, and extra buying costs. That is often a better planning method than relying on one headline rate or one salary multiple.
Trusted Resources
Official and high-trust sources
- Bank of England: Bank Rate and inflation context
- MoneyHelper: mortgage calculator guidance
- MoneyHelper: how much you may be able to borrow
- GOV.UK: Stamp Duty Land Tax
- Revenue Scotland: Land and Buildings Transaction Tax
- GOV.WALES: Land Transaction Tax guide
Related calculators on CalculatorZone
- Mortgage calculator - Compare a broader home loan estimate with taxes, insurance, and payoff timing.
- Mortgage payoff calculator - See how extra payments may shorten the loan term.
- Amortization calculator - Review a payment schedule year by year.
- Mortgage points calculator - Check whether a lower rate is worth the upfront fee.
- Stamp duty calculator - Estimate purchase tax before you set your full budget.
- Council tax calculator - Add a likely council tax bill to your monthly housing plan.
- UK income tax calculator - Turn gross income into a more realistic take-home pay estimate.
- Lifetime ISA calculator - Plan a first-home deposit or retirement savings target.
- Help to Buy ISA calculator - Check the bonus effect if you already hold a Help to Buy ISA.
- Down payment calculator - Test how a larger deposit changes the size of the loan.
Disclaimer
Educational use only: This article and calculator are for planning and educational purposes only.
Results may vary: Your actual mortgage payment, fees, tax bill, and approval outcome may differ because lender rules, valuation, credit history, legal costs, and product terms vary.
Get professional help when needed: If you are unsure how a mortgage, tax rule, or repayment strategy applies to your situation, speak with a qualified mortgage adviser, broker, solicitor, conveyancer, accountant, or tax professional before making a binding decision.
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