Money

Mortgages

Mortgage repayment calculator

Use our simple tool to calculate your mortgage rates and repayment amounts before you speak to the experts.

Edited by:
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July 10, 2025

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Take the guesswork out of buying

A mortgage application can be complex - but our mortgage calculator is designed to make things simpler. It helps you work out how much you might be able to borrow, what your monthly payments could look like, and how different interest rates or deposit amounts can affect your affordability.

If you're wondering what's realistic for your first flat, or you're looking to move home or remortgage with confidence, we can help you get your bearings.

Breaking down the mortgage maths

Our calculator takes the information you provide and works out your monthly mortgage repayments. Enter how much you want to borrow, your deposit, and your preferred mortgage term - and we'll do the rest.

For example:

Let's say you're looking at a home worth £250,000 and have a £50,000 deposit. That means you'd need a mortgage of £200,000. If you're looking at a 25-year term with an interest rate of 4.5%, the calculator will show your estimated monthly repayment - around £1,111 in this example.

You can also adjust the figures to see what happens if interest rates rise or if you put down a bigger deposit. It's a great way to explore different scenarios and see how small changes can impact your budget.

Tip: If you want to stay within a certain monthly payment, you can work backwards to see what property price fits.

Smart ways to use your mortgage estimate

While a mortgage calculator gives you a strong estimate, it's still just a guide. It doesn't take into account your credit history, existing debts, or the lender’s affordability checks - but it's a start. It gives you a ballpark figure to focus on and start narrowing down your options.

Another helpful feature is how it shows the impact of interest rates. We've all seen how quickly rates can change, and the calculator lets you model higher or lower rates to test your plans. This helps you stress-test your budget, so you're not caught out later if rates go up.

Summing up

Our mortgage calculator can unpack your mortgage options. Tweak the settings as much as you like to find the right balance between borrowing money comfortably and buying what you want. Whether you're starting your search as a first-time buyer or getting serious about a particular property, it's a smart first step.

Frequently Asked Questions

Does using a mortgage calculator affect my credit score?

No, using our mortgage calculator won't impact your credit score in any way. It doesn't involve a credit check and doesn't require any personal or financial details linked to your credit file. It's purely a tool to help you estimate what your monthly mortgage payments might be, based on the figures you provide. It's a safe and commitment-free way to start planning your mortgage.

Does using a mortgage calculator affect my credit score?

No, using our mortgage calculator won't impact your credit score in any way. It doesn't involve a credit check and doesn't require any personal or financial details linked to your credit file. It's purely a tool to help you estimate what your monthly mortgage payments might be, based on the figures you provide. It's a safe and commitment-free way to start planning your mortgage.

Does using a mortgage calculator affect my credit score?

No, using our mortgage calculator won't impact your credit score in any way. It doesn't involve a credit check and doesn't require any personal or financial details linked to your credit file. It's purely a tool to help you estimate what your monthly mortgage payments might be, based on the figures you provide. It's a safe and commitment-free way to start planning your mortgage.

How accurate is the mortgage calculator?

Our calculator gives a helpful estimate based on the numbers you enter, but it's not a formal offer or a mortgage in principle. It doesn't factor in your full financial picture, such as your income, regular expenses, credit history, or the detailed checks a lender carries out. That said, it's still a reliable way to see whether your plans are on the right track and what kind of repayments you might expect.

How accurate is the mortgage calculator?

Our calculator gives a helpful estimate based on the numbers you enter, but it's not a formal offer or a mortgage in principle. It doesn't factor in your full financial picture, such as your income, regular expenses, credit history, or the detailed checks a lender carries out. That said, it's still a reliable way to see whether your plans are on the right track and what kind of repayments you might expect.

How accurate is the mortgage calculator?

Our calculator gives a helpful estimate based on the numbers you enter, but it's not a formal offer or a mortgage in principle. It doesn't factor in your full financial picture, such as your income, regular expenses, credit history, or the detailed checks a lender carries out. That said, it's still a reliable way to see whether your plans are on the right track and what kind of repayments you might expect.

Can I use the calculator if I'm self-employed?

Yes, absolutely - you can still use the calculator to get a rough estimate. The process is exactly the same, and you simply input the figures you know, such as the loan amount, deposit, term, and interest rate. It's worth remembering that self-employed applicants are assessed differently by lenders - while the calculator won't reflect all the nuances, it's still a great way to start outlining the costs.

Can I use the calculator if I'm self-employed?

Yes, absolutely - you can still use the calculator to get a rough estimate. The process is exactly the same, and you simply input the figures you know, such as the loan amount, deposit, term, and interest rate. It's worth remembering that self-employed applicants are assessed differently by lenders - while the calculator won't reflect all the nuances, it's still a great way to start outlining the costs.

Can I use the calculator if I'm self-employed?

Yes, absolutely - you can still use the calculator to get a rough estimate. The process is exactly the same, and you simply input the figures you know, such as the loan amount, deposit, term, and interest rate. It's worth remembering that self-employed applicants are assessed differently by lenders - while the calculator won't reflect all the nuances, it's still a great way to start outlining the costs.

What deposit do I need to use the mortgage calculator?

You can enter any deposit amount into the calculator. In the UK, 5% is typically the minimum deposit accepted by lenders, though a bigger deposit - such as 10%, 15%, or 20% - usually unlocks better mortgage deals with lower interest rates. The calculator lets you see how a bigger deposit affects the size of your loan and your monthly payments.

What deposit do I need to use the mortgage calculator?

You can enter any deposit amount into the calculator. In the UK, 5% is typically the minimum deposit accepted by lenders, though a bigger deposit - such as 10%, 15%, or 20% - usually unlocks better mortgage deals with lower interest rates. The calculator lets you see how a bigger deposit affects the size of your loan and your monthly payments.

What deposit do I need to use the mortgage calculator?

You can enter any deposit amount into the calculator. In the UK, 5% is typically the minimum deposit accepted by lenders, though a bigger deposit - such as 10%, 15%, or 20% - usually unlocks better mortgage deals with lower interest rates. The calculator lets you see how a bigger deposit affects the size of your loan and your monthly payments.

Does the calculator show the total cost of the mortgage?

Our calculator is designed to give you a strong starting point for planning your budget and comparing different mortgage scenarios. But keep in mind there may be many extra costs that could affect the mortgage amount and annual percentage rate (APR). Factors like interest rate changes, and whether you choose a variable or tracker mortgage, can impact the total interest paid.

Does the calculator show the total cost of the mortgage?

Our calculator is designed to give you a strong starting point for planning your budget and comparing different mortgage scenarios. But keep in mind there may be many extra costs that could affect the mortgage amount and annual percentage rate (APR). Factors like interest rate changes, and whether you choose a variable or tracker mortgage, can impact the total interest paid.

Does the calculator show the total cost of the mortgage?

Our calculator is designed to give you a strong starting point for planning your budget and comparing different mortgage scenarios. But keep in mind there may be many extra costs that could affect the mortgage amount and annual percentage rate (APR). Factors like interest rate changes, and whether you choose a variable or tracker mortgage, can impact the total interest paid.

Can I use the calculator for remortgaging?

Yes, it's just as useful as a remortgage calculator. When you remortgage, you're replacing your existing mortgage with a new one - often to get a better rate or release some equity. To use the calculator for this, just enter your remaining mortgage balance as the loan amount, and adjust the term and interest rate to reflect the new deal you're considering.

Can I use the calculator for remortgaging?

Yes, it's just as useful as a remortgage calculator. When you remortgage, you're replacing your existing mortgage with a new one - often to get a better rate or release some equity. To use the calculator for this, just enter your remaining mortgage balance as the loan amount, and adjust the term and interest rate to reflect the new deal you're considering.

Can I use the calculator for remortgaging?

Yes, it's just as useful as a remortgage calculator. When you remortgage, you're replacing your existing mortgage with a new one - often to get a better rate or release some equity. To use the calculator for this, just enter your remaining mortgage balance as the loan amount, and adjust the term and interest rate to reflect the new deal you're considering.

Can I use the calculator for remortgaging?

Yes, it's just as useful as a remortgage calculator. When you remortgage, you're replacing your existing mortgage with a new one - often to get a better rate or release some equity. To use the calculator for this, just enter your remaining mortgage balance as the loan amount, and adjust the term and interest rate to reflect the new deal you're considering.

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Ready to try our mortgage calculator?

Speak to the mortgage experts with confidence - find out how much you could borrow and what your repayments might look like.

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About the author

Lawrence Howlett

Lawrence Howlett brings a results-driven mindset to his writing, shaped by over a decade of experience across finance, legal, and energy sectors. As the founder of Moneysavingadvisors, he’s built a reputation for turning complex financial concepts into clear, actionable insights for consumers. His writing stands out for its clarity, structure, and focus on delivering value.

Learn more about Lawrence Howlett