Rate Change Calculator

You can use this calculator to get an idea of how an interest rate change could affect your monthly mortgage payments.

Simply fill in your mortgage details below and calculate to reveal the interest rate change slider. You can find information about your mortgage in your year-end statement.

Bank of England base rate

What is it?

The Bank of England (BoE) base rate is the official interest rate set by the BoE Monetary Policy Committee (MPC). Banks and Building Societies use this base rate to calculate interest rates for some of their mortgages and savings offerings.

How could it affect you?

If the BoE base rate changes, your monthly mortgage payments may be affected if you're on a tracker or variable rate mortgage, so you might benefit from anticipating what a rate change could mean for you.

How can Nationwide help you?

If you're a Nationwide mortgage customer and the base rate changes, we'll write to you to confirm your new rate and payment details if your current mortgage is affected. If you'd like to find out more, please visit our dedicated Bank of England base rate page, or use the calculator below to work out how a base rate change may affect your monthly mortgage payments.

See how a rate change could affect your mortgage

Your outstanding mortgage balance


Your repayment type

Your remaining term

Your current mortgage interest rate


Your monthly repayments could be more

Your monthly repayments could be less


Change of 0%

Change of 5%

Move the slider to see how base rate changes could affect your monthly mortgage payments.

This calculator provides an indication of the possible change in your monthly mortgage payments in the event of an interest rate change. All figures are indicative and for illustrative purposes only.

There is a limit to how low your interest rate can be if you're on a Nationwide tracker mortgage. Find out more about tracker floor.

Interest only mortgages

If you repay all or part of your mortgage on an interest only basis, your monthly payments only pay the interest due and don’t go towards reducing the amount you borrowed. So it’s important you have plans in place and regularly check they’re on track to repay the full interest only amount by the end date of the mortgage.

Switch your deal

To secure your future monthly mortgage payments, look into switching your mortgage deal.

Budget Calculator

Use our handy budget calculator to work out how your new monthly payments could affect you.

Help and support

Find out more about the Bank of England base rate, or get in touch with our mortgage helpline for further information.


Mortgages are subject to underwriting and criteria. Minimum age 18, UK residents only.