Free calculator · no account needed

Interest rate change impact

Show how a new rate changes the monthly interest on a balance that does not fall.

Illustrative result

£300.00 more interest

This is the change in interest if the balance stays the same. A repayment mortgage will differ because principal falls.

Can I use this for a mortgage deal ending?

As a rough interest change, yes. Use the fixed-versus-another-rate calculator for a full repayment comparison.

The result stays in your browser. Create an Aldoraun account if you want to keep a budget, accounts and a cashflow forecast.

Estimates only. Tax and repayment rules can change, and this is not financial, tax or pension advice.