Free Online Mortgage & Financial Calculators UK | North Star
We believe understanding your finances is the first step towards taking control of them.
At North Star, we want to be leading brokers of financial empowerment. That means doing more than arranging mortgages, recommending protection or helping you navigate financial decisions. We want to give you the knowledge, confidence and tools to understand your own finances and feel comfortable advocating for yourself.
We don't believe the financial services industry should keep its knowledge to itself. You deserve to understand what you're borrowing, what you're paying for, what your options are and why a particular financial product might be recommended.
That's why we've created a collection of 13 free financial calculators and helpful tools, covering everything from mortgage payments and first-time buyer deposits to property investment, income protection and equity release.
Whether you're buying your first home, reviewing your existing mortgage, protecting your family or exploring your financial options for later life, our calculators are designed to help you understand the numbers behind your decisions.
You can explore different scenarios in your own time, get a clearer picture of what might be possible and feel better prepared when you're ready to speak to an adviser.
Because good financial advice shouldn't depend on keeping things complicated. It should help you understand your options and make informed decisions with expert support.
Why have we created these financial calculators?
Financial decisions can feel overwhelming, particularly when you're dealing with unfamiliar terminology, complicated calculations or financial products you've never encountered before.
We want to change that.
Imagine being able to explore how different mortgage rates could affect your monthly payments before your current deal expires. Or understanding how much you might save by making mortgage overpayments. Perhaps you're buying your first property and want to work out how much deposit you'll need.
Having access to this information can make a real difference to your confidence.
Our calculators allow you to explore the figures, compare different scenarios and understand how changing one element of your finances could affect another.
They're not intended to replace professional advice. Instead, they're designed to help you get more from it.
When you understand the numbers and terminology, you're better equipped to ask questions, discuss your priorities and make decisions that reflect your circumstances.
And when you need someone to navigate lender criteria, compare financial products or understand how everything fits together, that's where we come in.
Buying a home: Mortgage, deposit and Stamp Duty calculators
Buying a property is one of the biggest financial commitments many of us will make.
From finding your deposit to understanding your monthly repayments and budgeting for additional costs, there's plenty to consider before you collect the keys.
Our first three calculators can help you start planning.
1. Mortgage Payment Calculator: How much could your mortgage cost?
Our Mortgage Payment Calculator helps you estimate how much your mortgage repayments could be each month.
Enter your proposed mortgage amount, interest rate and repayment term to explore how different scenarios could affect your payments.
For example, you can investigate how changing your mortgage term might reduce your monthly commitments or how an increase in interest rates could affect your budget.
The calculator can also help illustrate the difference between repayment and interest-only mortgages.
It's useful for first-time buyers, home movers and existing homeowners who want to understand their mortgage costs.
Remember that a repayment calculator estimates the cost of borrowing. It doesn't tell you how much a lender will offer, as this depends on your income, expenditure, credit history and individual lender criteria.
2. First Time Buyer Deposit Goal Calculator: How much should you save?
Saving for your first home is an exciting milestone, but knowing how much deposit you'll need can feel like a moving target.
Our First Time Buyer Deposit Goal Calculator helps you work out the deposit required for different property prices and deposit percentages.
Whether you're exploring a 5%, 10% or larger deposit, the calculator gives you a clearer idea of the savings target you're working towards.
For example, if you're considering buying a property for £250,000, a 5% deposit would be £12,500, while a 10% deposit would be £25,000.
The deposit you have available can influence the mortgage products and interest rates you may be eligible for. However, it's also important to consider your other property-buying costs and retain sufficient savings for your circumstances.
Our calculator is a useful starting point for anyone beginning their journey towards homeownership.
3. Stamp Duty Calculator: Understand your property-buying costs
Your mortgage and deposit are only part of the cost of purchasing a property.
Depending on the property's location, purchase price and your circumstances, you may also need to pay property tax.
Our Stamp Duty Calculator helps you estimate the Stamp Duty Land Tax (SDLT) that could be payable when purchasing a property in England, Scotland, Wales or Northern Ireland.
You can explore different purchase prices and buyer circumstances, including first-time buyer and additional property scenarios.
Understanding this potential expense early can help you create a more realistic home-buying budget and avoid unexpected costs as you approach completion.
Different property taxes apply in Wales and Scotland, so it's important to check the rules relevant to where you're buying.
Already have a mortgage? Understand your options:
Your mortgage shouldn't be something you only think about when your current deal is about to expire.
Understanding how interest rates, overpayments and different mortgage arrangements could affect your finances can help you make more informed decisions throughout your mortgage term.
We've created four tools specifically to help homeowners explore these questions.
4. Remortgage Rate Comparison Tool: What could a new rate mean for your payments?
If your existing mortgage deal is coming to an end, it's worth understanding how different interest rates could affect your monthly repayments.
Our Remortgage Rate Comparison Tool allows you to explore different mortgage rate scenarios using your remaining balance and term.
It can help you understand what your repayments might look like if you move to a different rate, whether you're considering remortgaging to another lender or reviewing the options offered by your existing provider.
You can also use it to explore the potential impact of interest rate changes on your household budget.
However, a lower interest rate doesn't automatically mean a lower overall mortgage cost. Arrangement fees, incentives, early repayment charges and product terms can all affect the amount you pay.
That's why understanding the figures is an excellent starting point, but comparing actual mortgage products requires looking at the bigger picture.
5. Mortgage Overpayment Calculator: Could paying extra save you money?
Have you ever wondered what might happen if you paid an extra £50 or £100 towards your mortgage each month?
Our Mortgage Overpayment Calculator helps you explore how making additional payments could reduce your mortgage balance, save interest and potentially shorten your mortgage term.
You can investigate the potential impact of regular monthly overpayments or making a larger lump-sum payment.
Overpayments reduce the outstanding mortgage balance, which can mean less interest is charged over time.
However, many mortgage products have limits on how much you can overpay without incurring an early repayment charge.
It's also worth considering your wider financial circumstances, including accessible savings and any other debts, before committing additional money to your mortgage.
6. Offset Mortgage Calculator: Could your savings work alongside your mortgage?
An offset mortgage allows you to link eligible savings to your mortgage, potentially reducing the amount of mortgage interest you're charged.
Instead of earning interest on your linked savings, their balance is used to offset part of your outstanding mortgage.
Our Offset Mortgage Calculator allows you to explore how this arrangement could affect your mortgage interest and repayment term.
For example, if you had a £250,000 mortgage and £30,000 in eligible linked savings, you could potentially pay mortgage interest on £220,000 rather than the full outstanding balance.
Offset mortgages can be worth exploring if you maintain substantial savings, have an irregular income or want to retain access to your money.
However, they aren't necessarily suitable for everyone. The interest rates available, your savings balance and the alternative returns you could earn all need to be considered.
7. Fixed vs Tracker Comparison Tool: Understand the difference
Fixed-rate and tracker mortgages behave differently when interest rates change.
A fixed-rate mortgage provides certainty over your interest rate for an agreed period, while a tracker mortgage normally follows an external rate, commonly the Bank of England base rate, plus or minus an agreed margin.
Our Fixed vs Tracker Comparison Tool lets you explore different interest rate scenarios and understand the potential impact on your monthly repayments.
Rather than attempting to predict where interest rates might go next, you can investigate what different outcomes could mean for your mortgage.
For example, how would an increase in interest rates affect your monthly payments on a tracker mortgage? What would happen if rates fell?
Exploring these scenarios can help you think about the level of payment certainty you prefer and prepare for a more detailed discussion about your mortgage options.
Property investment: Calculators for landlords and buy-to-let investors
If you're considering purchasing a rental property or already have an investment portfolio, understanding your numbers is essential.
The purchase price is only one part of a property investment. Mortgage costs, expected rental income, ongoing expenses and how you structure your investment can all affect the overall financial picture.
Our next three calculators help you explore different aspects of property investment.
8. Rental Yield Calculator: Calculate the potential return on a rental property
Rental yield is a useful figure when comparing buy-to-let properties or assessing an existing investment.
Gross rental yield measures a property's annual rental income as a percentage of its purchase price or value.
Our Rental Yield Calculator allows you to enter a property's value and expected rental income to estimate its gross rental yield.
For example, a property purchased for £200,000 that generates £1,000 per month in rent would have a gross annual rental yield of 6%.
However, gross rental yield doesn't represent the profit you'll make from a property.
Mortgage costs, repairs, insurance, letting agent fees, service charges, tax and periods without a tenant can all affect your overall return.
The calculator provides a starting point for comparing properties and understanding the relationship between purchase prices and rental income.
9. Personal vs Limited Company Buy-to-Let Calculator: Explore different ownership structures
Should you purchase an investment property in your own name or through a limited company?
It's a question many landlords consider, particularly when expanding their property portfolios.
Our Personal vs Limited Company Buy-to-Let Calculator allows you to explore illustrative scenarios involving different property ownership structures.
Mortgage rates, arrangement fees, borrowing criteria and deposit requirements can vary depending on whether a property is purchased personally or through a limited company.
There are also potentially significant tax considerations, including how rental income is taxed and how profits are withdrawn from a company.
The calculator can help you begin understanding the numbers involved, but the choice of ownership structure deserves careful consideration.
We recommend seeking appropriate tax advice alongside specialist mortgage advice before deciding how to purchase or hold an investment property.
10. Bridging Finance Estimator: Understand the potential cost of short-term borrowing
Bridging finance can be useful when you need access to property funding for a relatively short period.
It may be considered when purchasing a new property before selling your existing home, buying at auction or financing a property that isn't currently suitable for a conventional mortgage.
Our Bridging Finance Estimator helps you explore the potential cost of short-term borrowing using the loan amount, monthly interest rate and expected borrowing period.
It can help you understand how the length of a bridging loan could affect your interest costs and provide an initial illustration of the borrowing involved.
However, bridging finance may also involve arrangement fees, valuation costs, legal fees and other expenses.
Having a realistic and achievable exit strategy is particularly important, as this determines how you expect to repay the loan.
Financial protection: Understanding what you're protecting
Financial empowerment isn't just about how much you earn, borrow or invest.
It's also about understanding how financially secure you and the people who depend on you would be if your circumstances changed unexpectedly.
We believe everyone should have the opportunity to explore their financial vulnerabilities and understand the different ways they might protect themselves.
That's why we've included two protection-focused tools in our new collection.
11. Income Protection Gap Calculator: What happens if you can't work?
Your income supports your lifestyle, household commitments and future plans.
But how long could your finances cope if illness or injury prevented you from working?
Our Income Protection Gap Calculator helps you explore the potential difference between your usual earnings and the financial support you may have available during a period away from work.
This might include employer sick pay, existing insurance arrangements or accessible savings.
By understanding the potential shortfall, you can begin thinking about how long your household could continue meeting its essential expenses.
Income protection insurance can provide a regular benefit if you become unable to work because of illness or injury and meet the policy's claim conditions.
However, the appropriate level of cover, deferred period and benefit payment period will depend on your circumstances and the options available.
Our calculator gives you a starting point for understanding the financial risk before exploring potential solutions.
12. Key Person Cover Impact Calculator: Could your business cope without someone essential?
For many businesses, certain individuals play a particularly important role in generating revenue, maintaining client relationships or ensuring day-to-day operations run smoothly.
Losing one of those people through death or serious illness could have a significant financial impact.
Our Key Person Cover Impact Calculator helps business owners explore the potential financial consequences of losing an important employee, director or business owner.
You can begin considering factors such as lost revenue, additional recruitment costs and the disruption involved in replacing specialist knowledge or experience.
Key person insurance is designed to provide financial support to a business following a valid claim involving an insured key individual.
Understanding your potential financial exposure can help you have a more informed conversation about business protection and the appropriate level of cover.
Planning for later life: Explore your property wealth
13. Equity Release Calculator: How much equity could you potentially access?
For homeowners aged 55 and over, later-life lending may provide opportunities to access some of the wealth held in their property.
Our Equity Release Calculator , provided by Pure Retirement, offers an initial estimate of how much equity you may potentially be able to release from your home.
The amount available will depend on factors including your age, property value and the lender's individual criteria.
People explore equity release for many different reasons, including home improvements, repaying existing borrowing or supporting family members financially.
However, equity release is a significant financial decision, and it's important to understand the potential long-term consequences.
With a lifetime mortgage, interest may be added to the loan balance, meaning the amount owed can grow over time. Equity release can reduce the value of your estate and may affect entitlement to means-tested benefits.
Our calculator provides a starting point for exploring what might be possible.
At North Star, we consider your wider circumstances and other later-life borrowing options before making any recommendation.
How to get the most from our financial calculators
The real value of a financial calculator isn't necessarily the first number it gives you. It's what you can learn by exploring different scenarios.
If you're buying a home, try adjusting the mortgage amount, interest rate and repayment term to understand how each affects your estimated monthly payment.
If you're already a homeowner, explore what making additional mortgage payments or changing your mortgage arrangement might mean over time.
And if you're considering property investment or reviewing your protection, use the tools to identify questions you might not previously have considered.
Our calculators are designed to provide illustrations based on the information you enter. They don't constitute personalised financial, mortgage, insurance or tax advice, and they can't determine your eligibility for a particular financial product.
But they can help you become better informed, more confident and more involved in your financial decisions.
Frequently asked questions about our financial calculators
Are North Star's financial calculators free?
Yes. All 13 of our financial calculators and helpful tools are free to use. They cover mortgages, property purchases, buy-to-let investment, financial protection and equity release.
You can use them to explore different scenarios and improve your understanding of the numbers before speaking to an adviser.
Can a mortgage calculator tell me how much I can borrow?
A mortgage repayment calculator estimates the monthly cost of a particular loan amount, interest rate and mortgage term.
It doesn't determine how much you can borrow.
Mortgage affordability depends on your income, expenditure, financial commitments, credit history and the lender's individual assessment criteria.
A mortgage adviser can help you investigate the borrowing options available based on your circumstances.
How much deposit do I need to buy my first home?
The amount of deposit required depends on the property's purchase price and the mortgage products available to you.
Some mortgages may be available with a deposit of 5%, although eligibility and lender criteria will apply.
Our First Time Buyer Deposit Goal Calculator helps you explore different deposit percentages and see how much you would need to save for your target property price.
Can making mortgage overpayments save me money?
Making additional mortgage payments can reduce your outstanding balance and the total interest you pay.
Depending on your mortgage and how your lender applies overpayments, you may also be able to reduce your remaining mortgage term.
However, some mortgage products impose early repayment charges if you exceed the permitted overpayment allowance.
Our Mortgage Overpayment Calculator allows you to explore the potential benefits before deciding whether overpaying is appropriate for you.
What's the difference between gross rental yield and rental profit?
Gross rental yield compares a property's annual rental income with its purchase price or value, expressed as a percentage.
It doesn't take account of expenses such as mortgage costs, maintenance, insurance, letting fees or taxation.
Our Rental Yield Calculator helps you calculate gross yield as a starting point when comparing properties, but you should also consider the costs associated with owning and maintaining a rental property.
Can I use these calculators before speaking to a mortgage or protection adviser?
Absolutely. That's exactly why we've created them.
Exploring different scenarios beforehand can help you identify your priorities, understand the terminology and prepare questions about your options.
A calculator provides information, while an adviser can investigate your individual circumstances, compare suitable products and explain the considerations that a general calculation cannot capture.
Financial empowerment means being part of the conversation
We want North Star to be somewhere you can learn, explore your options and feel genuinely involved in the decisions being made about your money.
We don't want you to need financial advice simply because the industry feels impossible to understand.
We want you to value expert advice because you understand what it brings to the table.
Our experience helps us navigate lender criteria, insurance underwriting, mortgage products and the many individual factors that influence financial decisions.
Your understanding of your own circumstances, priorities and aspirations is just as important to that conversation.
When we bring those things together, we can make financial decisions with greater clarity and confidence.
Our new calculators are just one part of that commitment.
We've also introduced The Compass, our home for financial guides, explanations and updates, alongside the North Star Jargon Buster, which helps you understand the terminology you're likely to encounter.
Together, these resources are designed to help you build your financial knowledge, ask better questions and feel more confident about your future.
And we'll keep adding to them.
Based in Chester, Cheshire, North Star Mortgages & Financial Services supports clients across the UK, providing personalised mortgage, protection and financial guidance.
Whether you're taking your first steps onto the property ladder, reviewing your mortgage, protecting your family or considering your options for later life, we're here to help.
Informed decisions, expertly guided | Free mortgage and financial calculators UK
Our calculators provide illustrative information and do not constitute personalised financial, mortgage, insurance or tax advice. Your home is at risk if you fail to keep up payments on your mortgage or other loans secured against it.
Buy-to-let mortgages and commercial lending are not usually regulated by the Financial Conduct Authority. Equity release can affect the value of your estate and entitlement to means-tested benefits. To understand the features and risks of equity release, ask for a personalised illustration.
North Star Mortgage & Financial Services Ltd is an Appointed Representative of New Leaf Distribution Ltd, which is authorised and regulated by the Financial Conduct Authority (FCA 460421).
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