Tell us the basics
Enter your mortgage term, outstanding balance and repayments to get started
Get a quick calculation
See how your payments could go up if you don't switch when your deal ends
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Use your results to compare remortgage options for your home
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Enter the following details about your current mortgage to calculate how much it could cost you if you don’t remortgage at the end of your deal. The info you need will be on your most recent mortgage statement.
Keep in mind that:
The calculation is based on you being moved onto an SVR of 6.49%1 at the end of your deal
The real rate will vary depending on your lender and wider market rates at the time.
You can borrow the remaining balance on your mortgage when switching, and may be able to borrow extra by releasing equity from your home.
If you switch to a new lender, you’ll need to remortgage. But if you stick with your current lender, you can do a product transfer - a simpler process that usually involves fewer checks.
If you decide to remortgage with a different provider, they’ll do a detailed review of your finances, checking...
How much your property is worth (at current market prices)
Including your credit score, monthly income and outgoings. A lender will want to check you can afford the repayments on the mortgage you’re applying for
Your loan-to-value (LTV) ratio is the amount you want to borrow as a percentage of the property’s value. For example, if your home is worth £200,000 and you’re looking for a £120,000 mortgage, your LTV would be 60%
Did you know?
Your equity is the current value of your property minus the outstanding mortgage balance.
Our remortgage calculator works out how much you could pay if you don’t switch and instead end up sliding onto a lender’s typical standard variable rate (SVR) of 6.49%1.
Our tool makes this calculation based on:
Your outstanding mortgage balance
The time left before your mortgage is completely paid off.
Use our mortgage calculators to work out how much you might be able to borrow and what your monthly repayments could look like when buying a home.
If you’re over the age of 55 and a UK homeowner, use our equity release calculator to see how much equity you could release from your property.
Go to equity release calculator
Find out how much you could afford to borrow and what your monthly loan repayments might be.
Our calculator shows you how much stamp duty you’ll pay when buying a property in the UK. Just enter the price and buyer type to see how much you might have to pay.
It might be worth remortgaging for the following reasons:
Your current deal is ending and you can find a cheaper interest rate than your lender’s SVR
To release equity for home improvements
To change your mortgage term – make it longer to reduce your monthly payments or shorter to pay off your mortgage more quickly
Your property’s value has gone up and/or your mortgage balance has gone down significantly, meaning you’re in a lower LTV band and eligible for a cheaper interest rate.
The amount you’ll save depends on your outstanding balance, the mortgage rate and the number of years left on your mortgage.
Also remember to factor in any fees that come with the new mortgage, and any early repayment charge you might face if you exit your current deal before the introductory period ends.
If you don’t remortgage before the fixed, tracker or discounted rate on your mortgage ends, you’ll usually be moved onto your lender’s standard variable rate – which will almost always be much higher.
Yes, you should be able to remortgage whenever you like.
If your current deal is due to end soon, you can generally lock in a new mortgage up to six months in advance, and then switch to something else if a better rate becomes available between then and the start of the new deal. This can be a savvy move if interest rates are going up, or look likely to do so.
If you remortgage before your current agreement comes to an end, you’ll most likely have to pay an early repayment charge (ERC). This is normally a percentage of the outstanding mortgage balance, but always check the exact cost with your lender before starting the remortgage process.
Most people with an existing mortgage will be eligible to remortgage.
Some lenders may also have age limits. It might be more difficult to remortgage if you’re over 65 and retired.
The remortgaging process typically takes around four to eight weeks to complete, from the time you apply. This is usually the case if you’re looking to borrow more or release equity, or if you’re remortgaging with a different lender.
However, a simple rate switch with your existing lender for the same balance (known as a ‘product transfer’) can be done in less time – sometimes even within a day.
There are several steps you could take to help you find the best interest rate:
Improve your credit score – a higher credit score could give you access to better deals.
Reduce your LTV – if you’re in a lower loan-to-value band, you can often find cheaper remortgage deals.
Build up a steady employment record – lenders like stability and a steady income.
Compare deals – save time by comparing a wide range of mortgage deals through Compare the Market.
Your loan-to-value (LTV) is the ratio between the amount you want to borrow (your mortgage) and the value of your property. It’s shown as a percentage.
LTV = (loan amount ÷ property value) x 100
For example, if you’re buying a house valued at £400,000 and you’re looking for a mortgage for £300,000:
£300,000 ÷ £400,000 = 0.75
0.75 x 100 = 75
LTV = 75%
Sajni is passionate about finding money products to help you make great financial decisions. She keeps track of the latest trends and evolving markets to find new ways to help you save money.
1This standard variable rate is the average SVR from our top 6 lenders as of 2 July 2026.
