Mortgage comparison calculator
The lowest headline rate isn't always the cheapest deal once product fees are added in. Compare two mortgages side by side and see the true cost across the fixed period.
Deal 1
Deal 2
Cheaper over the fixed period
Deal 2 — saves £1,183
Deal 1 monthly
£1,374
Deal 2 monthly
£1,346
Deal 1 total cost
£83,440
Deal 2 total cost
£82,257
Total cost = monthly payments over the fixed period + product fee. Doesn't include cashback, free valuations, legal fees or early repayment charges. A lower headline rate isn't always cheaper once fees are factored in — an adviser can model the true cost across the lender's full range.
Why rate alone is misleading
A 4.19% rate with a £1,499 fee can easily cost more over a 2-year fix than a 4.39% rate with a £0 fee — but on a 5-year fix it can flip the other way. The bigger your mortgage balance and the longer your fixed period, the more a lower rate is worth, because the fee is spread further.
What this calculator doesn't include
- Cashback, free legal work or free valuations (which can shift the answer by £500–£1,500).
- Early repayment charges if you exit either deal early.
- Differences in incentives like overpayment allowances or product portability.
Other mortgage calculators
More tools to help you plan your mortgage.
Mortgage repayments calculator
Work out your monthly payment from the loan amount, rate and term.
Remortgage calculator
Compare your current deal against new rates to see potential savings.
Overpayment calculator
See how much interest and time you'd save by overpaying.
Rate change calculator
See what happens to your payment if your rate moves up or down.