Property Tools
MORTGAGECOST COMPARISON
Designed by mortgage advisors · Built for the mortgage industry
Compare mortgage deals on their true cost — including payments over the deal term, product fees, valuation, legal costs, and remaining balance. See whether adding a fee to the mortgage actually costs you more.
Deal A
Deal B
How the Comparison Works
Monthly Repayment Formula
P = mortgage balance
r = monthly interest rate (annual ÷ 12 ÷ 100)
n = full term in months
The standard UK capital repayment formula. If the product fee is added to the mortgage, P increases accordingly, raising both the monthly payment and total interest.
Remaining Balance Formula
k = deal term in months
B(k) = outstanding balance at end of deal
The remaining balance matters at remortgage — a lower balance improves your loan-to-value ratio and may qualify you for better rates on your next deal.
Total Cost of Deal
Upfront Fees = product fee (if not on balance)
+ valuation + legal + other fees
This is the true cash outflow during the deal period. It is the primary figure mortgage advisors use to determine which deal is genuinely cheaper for a client.
Fee to Mortgage vs. Pay Upfront
→ Higher M, more interest paid
Paid upfront → P unchanged
→ Lower M, fee added directly to total cost
Adding a fee to the mortgage typically costs more over the term due to compounding interest, but avoids an upfront cash requirement. This calculator shows both scenarios clearly.
Mandeep Singh · 25+ Years UK Financial Services
Important Information
This calculator is for illustrative purposes only and does not constitute mortgage advice, a personal recommendation, or a mortgage offer.
Results are based on the figures you enter and assume a standard capital repayment structure. Actual rates, fees, terms, and eligibility will vary by lender and individual circumstances.
You should seek independent advice from a qualified mortgage adviser or broker before making any financial commitment.