Mortgage Overpayment Calculator
Monthly Pay:
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| Current | Total |
|---|
Result
Principal / Base
Growth / Benefit
Tax / Cost
Other
Detailed Calculation
Enter your values and click Calculate to see the calculation.
What can you use this calculator for?
Free Mortgage Overpayment Calculator for UK users with clear, instant results.
- See the monthly payment before you borrow.
- Compare shorter and longer loan terms.
- Understand how much of each payment is interest.
- Test the effect of extra payments on interest and time.
Important functions and useful information
Standard payoff time
Payoff time with extra payment
Interest saved
Time saved
Planning & Forecasting
You can change the inputs several times to create different scenarios. This is useful for comparing possible outcomes before making a decision.
Prepayment planning
Add an extra monthly payment to see how much interest and time you save.
Rate comparison
Change the interest rate to compare lenders or the effect of a rate change.
How to use this calculator
- Enter the required values in the calculator above.
- Check that the units, rate and period are correct.
- Click Calculate.
- Review the main result and the detailed breakdown.
- Change one or more values to compare another scenario.
Frequently Asked Questions
How do extra payments shorten a mortgage?
Extra money reduces the principal directly, so interest is charged on a smaller balance every month and the loan ends sooner.
Is this the exact amount my lender will charge?
No. Lenders may add fees, insurance or use a different calculation method. Treat the result as an estimate and check your loan offer.
Can I compare different loans with this?
Yes. Run the same amount with different rates and terms and compare the monthly payment and total interest.
Can I change the inputs and recalculate?
Yes. Change any value and press Calculate. The result, the table and the explanation update straight away.
Note
Loan figures are estimates. Your lender's schedule, fees and rounding may differ.