The calculator estimates how your monthly mortgage repayments could change when your current deal ends. It compares your current payment to a potential new payment on your lender's Standard Variable Rate.

To use the remortgage calculator, you'll need your: 

• repayment type (capital and interest or interest only)
• outstanding mortgage balance
• remaining mortgage term
• and your current interest rate.

All calculator results are for illustrative purposes only and are based on the details you provide. Your results will serve as a guide for you, rather than offering the exact figures.

When you consider remortgaging will depend on your situation, however, it’s a good idea to explore remortgage options when your current mortgage deal is coming to an end. 

This is because you'll typically move onto your lender's Standard Variable Rate when your deal finishes, which could make monthly payments more expensive.

What other reasons might I remortgage?

Homeowners may choose to remortgage for a few reasons, including releasing equity on their home or reducing the number of years remaining on their deal.

Yes, it's possible to remortgage at any time. However, if you’d like to avoid paying early repayment charges, it's best to wait until your current deal ends. 

Read more in our guide to remortgaging

NatWest offers a variety of tools, including a mortgage rate finder which allows you to compare remortgage rates and the monthly payments. We also provide mortgage guides to help you explore your options.

Check out our mortgage calculators

Remortgaging means taking out a new mortgage on a property you own. The process involves replacing your existing mortgage with a new deal from a different lender – all while staying in the same property.

You may remortgage to:

• switch to a cheaper mortgage deal
• release equity to fund home improvements
• borrow money against the value of your property.

When should I start looking?

Many people start looking to remortgage around three to six months before their current mortgage deal ends. This allows you to lock in a new rate and avoid automatically rolling onto your current lender’s Standard Variable Rate (SVR), which often comes with a higher interest rate.

SVR stands for Standard Variable Rate – your lender’s default mortgage interest rate. Once your initial fixed or discounted mortgage deal ends, you’ll automatically move onto the Standard Variable Rate.

SVRs often move in line with the Bank of England base rate, so your lender can change the rate at any time. This could lead to monthly payments going up or down. 

You can remortgage as many times as you like. But whether you should depends on your personal circumstances, the terms of your current mortgage, and changes in interest rates.

If you’re considering remortgaging, be aware that an early repayment charge may apply. If you remortgage to NatWest, we’ll pay your legal and valuation costs (exclusions apply).

What fees can affect savings?

When remortgaging, it’s always worth factoring fees and costs rather than just the lowest interest rate.

These include:

• Legal and valuation fees
• Arrangement or product fees
• Early repayment charges (ERC)
• Broker fees (if you use a mortgage broker)
• Admin fees, also known as deeds release fees