Mortgage interest rate calculator

The mortgage interest rate change calculator below can show how much your monthly repayments could go up or down, based on changes to your interest rate.

What is the current Bank of England (BoE) base rate?

The current BoE base rate is 4.25%.

  • The Bank of England base rate is an interest rate that has an impact on mortgage rates. The base rate, or ‘bank rate,’ is the cost at which banks can borrow money from the Bank of England.

    Banks and Building Societies tend to charge their customers the base rate plus a bit to borrow from them, including for mortgages.


    Why does the Bank of England change the base rate?

    The Bank of England changes the UK base rate to try to keep the cost of living – ‘inflation’ – at a steady rate.

    It reduces interest rates when the economy is not doing well and people may be finding it hard to pay bills and mortgages. The base rate is a major factor in mortgage interest rates.

  • When the base rate goes up, your mortgage repayments may go up. When they go down your mortgage repayments may go down.

    Whether the base rate impacts your mortgage repayments or not will depend on the type of mortgage that you have taken out:

    • A fixed-rate mortgage. A mortgage with a fixed interest rate means it won’t be affected when the base rate goes up. If the base rate goes down, you won’t pay any less, however.
    • A variable-rate mortgage. You are likely to be placed onto a SVR mortgage when your mortgage deal comes to an end. This increase isn’t likely to be as high as it is for those on a tracker mortgage, but it could still impact what you pay.
    • A tracker mortgage. Tracker mortgage repayments are usually tied to the base rate plus a certain percentage. So, if the base rate rises by 0.25% for example, your repayments will increase by this amount. If the base rate goes down, you could pay less.

How our mortgage interest rate change calculator works

Use our interest rate change calculator to help you see how the cost of your mortgage repayments could go up or down.

What you’ll need

  • You will need to get your remaining mortgage balance and term from your most recent mortgage statement
  • You’ll need to know the interest rate you’ll be moving to

How it works

  • First enter your mortgage balance. This is how much you still need to pay to your lender
  • Then, the amount of time remaining until your mortgage is paid
  • Enter the current interest rate, then your mortgage type
  • Click on the plus and minus to choose the interest rate change amount you want to use


Where can I find my mortgage details?

You can find your mortgage details in your most recent annual mortgage statement or from Internet Banking. If you're not registering for Internet Banking yet, it's easy and only takes about 5 minutes to register.

I have more than one sub account, how do I use the calculator?

If your mortgage is made up of more than one sub account and some of these sub accounts are on variable rates, you will need to do a separate calculation for each sub account. To calculate the total change to your monthly payment, add each sub account calculation together.

You can find out if you have sub accounts on your most recent annual mortgage statement.

If a rate change takes place and it affects your mortgage, we will send you a letter confirming your new monthly mortgage payment before it is taken.

What are my next steps?

If your mortgage rate and monthly repayments are changing, then there are a few things you can do...

Switching your mortgage

Already have a mortgage with us and want to switch? Find out more about the deals that may be available.

Switching mortgages with Lloyds Bank

Mortgage calculators

See how much you could borrow and learn how remortgaging or overpaying could affect your repayments with our mortgage calculators.

Use our mortgage calculators

Worried about paying your mortgage?

Don’t wait until you’re about to miss a payment before getting in touch. The sooner you talk to us, the more options you’ll have. We have tools and guides to support you, and talking to us won’t affect your credit rating.

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  • You may find that your monthly payment has reduced if you have made overpayments to your mortgage. Your monthly payment will be recalculated based on any overpayments you might have made. This could mean your monthly payment has come down, despite a rise in the interest rate.

  • If you have arranged to take out additional borrowing, any amount that is on a fixed rate will not be impacted by a rate change. This is because the rate change will only impact variable rates. If you have arranged additional borrowing at a variable rate any offer will show the interest rates that applied at the time the offer was produced. If we change the variable rate after the offer is issued, we won’t write to you until you complete. When you complete, the letter will contain a new monthly payment and interest rates that will apply.

  • If you have arranged to switch to a new fixed rate product, this will not change as a result of a change to our variable mortgage rates. However, there may be part of your existing mortgage which is at a variable rate and this will be affected by a rate change. If this is the case, we will recalculate the monthly payment on any parts of the mortgage being charged interest at a variable rate and add these to the monthly payments on any fixed rate parts to give you a total new monthly payment.

  • If you have arranged to switch to a new fixed rate product and the new rate hasn’t yet taken effect, you can contact us and tell us that you have changed your mind. If the new rate already applies, you can still change your mind as long as you tell us within 28 days of the new rate taking effect.

Contact us

Need help with understanding your mortgage interest rate? Get in touch to discuss your mortgage.

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You could lose your home if you don’t keep up your mortgage repayments

Important legal information

Lloyds Bank plc. Registered office: 25 Gresham Street, London EC2V 7HN. Registered in England and Wales No. 2065. Lloyds Bank plc is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority under registration number 119278.

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