
Work out how a lump sum or monthly overpayment could shorten your mortgage term and reduce your total interest — plus a built-in Early Repayment Charge check so you can see upfront whether overpaying could trigger a penalty.
Mortgage overpayment calculator
Lump-sum overpayment modelling
Monthly overpayment modelling
Mortgage-term reduction calculation
Total interest-saving calculation
Early Repayment Charge check
Compare different overpayment strategies
Repayment projections
Instructions & Glossary
Ready to use in Excel