The Bank of England raises interest rates and this drives up mortgage rates, and our calculator lets you see what that might cost you.
You can see how much more you’ll pay on your mortgage if the lender changes the rate you’re paying (or how much you’ll save if rates drop).
The calculator allows you to use your current mortgage rate and see how different levels of rate appreciation will increase your interest and monthly payments.
Enter a number for the size of the price hike, for example, 0.25, 0.50. Or 0.75, or a negative value (eg -0.25) to lower the interest rate.
> Check out the best live mortgage rates you can apply for with our mortgage finder
What happens to interest rates
After more than a decade of post-financial crisis stagnation, interest rates are rising rapidly.
The Bank of England’s base rate, formally known as the bank rate, rose from 0.1 percent last December to 3 percent now, and is expected to continue to rise.
The latest hike came on Thursday, November 3, when the Bank’s interest rate setters added another 0.75 percentage point to bring the base rate up to 3 percent.
It comes as the Bank of England’s Monetary Policy Committee – the group of economists who vote on the base rate – looks to try to keep inflation under control.
The idea is that by raising the base rate, it raises the cost of borrowing and reduces the demand for it from consumers, households, and businesses, slowing the economy.
In theory, this should eventually lower inflation, which currently exceeds the Bank of England’s 2 percent target of 10.1 percent.

The Bank of England has raised interest rates significantly since the hikes began in December 2021
Prime rate versus mortgage rates
When the Bank of England changes the base rate, some mortgage rates will move, but not all.
Fixed deals will remain at the same level until they expire, base rate trackers will move the same amount as a bank shift, and variable standard rates or other associated deals will move an amount set by the lender.
The cost of fixed-rate mortgages has risen dramatically over the past year, spurred by the Bank of England’s hike in rates and exacerbated by the fallout from Liz Truss and Kwasi Kwarteng’s poorly received mini budget.
Debt-financed tax cuts in this – since reversed – have created financial turmoil, rising government borrowing costs, a vicious cycle of selling pension fund bonds, and expectation rates will have to go up even more.
Government borrowing costs, as measured by gold revenues, have since fallen to pre-mini-budget levels after the Bank of England intervened, before Quarting and then Truss resigned and Jeremy Hunt took over as chancellor and Rishi Sunak as prime minister, but reformed. Mortgage rates are still high.
The two-year flat rate average is currently at 6.47 percent and the five-year flat rate average is at 6.32 percent. In November 2021, the averages were 2.29 percent and 2.59 percent, respectively.
The latest news on interest rates and mortgages
Read our regularly updated guide to find out more: What’s next for mortgage rates and should you fix it?
Our Home and Mortgages section also contains the latest articles on mortgage rates.
Savers benefit from higher rates – check out the best savings rates in our independent tables.
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