gdt.mortgage

Mortgage Calculator

Model early repayments, early-repayment charges and remortgage options, and print a report.

No account needed — runs in your browser open Mortgage Calculator
Start by adding a property and mortgage, or load a saved scenario; reports are generated from the compare tab.
Start by adding a property and mortgage, or load a saved scenario; reports are generated from the compare tab.

What it does

  • Enter your balance, rate, term and payment and see the full amortisation.
  • Model overpayments — regular or lump sums — and see the interest and years saved.
  • Understand early-repayment charges (ERC) and whether paying them is worth it.
  • Compare a remortgage: new rate, fees and ERC against staying put.
  • Save a scenario to a file and load it later; print a report in colour or black and white with an executive summary.

Who it's for

Homeowners weighing up an overpayment or a switch, and anyone who wants the numbers before talking to a broker.

Your data

Everything happens in your browser. Nothing you type or upload is sent to the server, and nothing is stored unless the tool says it saves to your browser. This is a calculator, not financial advice.