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Mortgage Rate Change Calculator

See how a change in interest rate affects your monthly payments and how much you could save or spend.

Your Details

Loan Amount
£
Remaining Term
yrs

Current Interest Rate
%

New Interest Rate
%

Payment Comparison

Current Monthly Payment £0.00
New Monthly Payment £0.00
Monthly Difference £0.00
Annual Saving £0.00
Over the full term

These figures are for illustrative purposes only. They are based on a standard capital repayment mortgage and should not be relied upon as financial advice. Your actual payments will depend on your lender, product terms, and personal circumstances. Speak to one of our advisers for a personalised recommendation.

Interest Rate Calculator

Plan Ahead

Compare the real cost of different mortgage rates before you commit. Small differences in rate have a large cumulative impact over a 25-year term.

Calculate Accurately

Enter your loan amount, mortgage term and the interest rates you want to compare to see the monthly repayment and total interest for each option.

Secure Your Move

Understanding the true cost of your rate options helps you decide whether it is worth paying a higher arrangement fee for a lower rate, or whether a no-fee deal works out cheaper overall.

Compare Interest Rates

How Does Your Mortgage Rate Affect What You Pay?

Your mortgage interest rate determines how much your lender charges you to borrow money. On a repayment mortgage, the rate affects both your monthly payment and the total amount you repay over the term. The difference between a 3.5% and a 5% rate on a £250,000 mortgage over 25 years is over £50,000 in total interest paid.

Fixed vs Variable Rates A fixed rate gives you the same monthly payment for a set period, typically two, three or five years. This makes budgeting straightforward and protects you if rates rise. A variable or tracker rate moves in line with the Bank of England base rate. Variable rates can be lower when conditions are right, but they also expose you to rate increases. Most borrowers choose fixed rates for the predictability they offer, particularly when planning a family budget.

The True Cost of a Mortgage Deal The headline interest rate is not the only number that matters. Product fees, arrangement fees and valuation charges all affect the true cost. A deal with a 3.9% rate and a £1,499 arrangement fee may cost more over a two-year term than a 4.1% rate with no fee, depending on your loan size. Our advisers can calculate the true cost of competing deals on your specific loan amount so you can compare like for like.

When to Review Your Mortgage Rate Your mortgage rate should be reviewed regularly, not just when a deal expires. Rates change, your LTV improves as your balance falls and your property may have increased in value since you bought. Reviewing your rate six months before your fixed term ends gives you enough time to compare options and secure a new deal without rolling onto your lender's standard variable rate, which is almost always considerably higher than the best rate available on the open market.

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