Model prepayments while keeping the scheduled principal-and-interest payment unchanged.
Calculate with the Mortgage Extra Payment Calculator
Enter the details below. Required values are validated before results are shown.
Mortgage Extra Payment Calculator results
How to use the Mortgage Extra Payment Calculator
- Choose the display currency and any calculation mode or frequency.
- Enter each required value using a consistent currency and time basis.
- Select Calculate or press Enter.
- Review the result explanation, assumptions, and any schedule before relying on the estimate.
Worked example
Adding 100 each month plus one annual payment can reduce both payoff time and total interest.
Understanding the results
The summary separates the most important output from supporting values. Currency selection changes formatting only; it does not convert exchange rates or alter a currency-independent formula.
Frequently asked questions
Will a lender automatically apply extra payments to principal?
Extra amounts are capped at the balance due, and the scheduled payment is not recast. The result depends on the values and assumptions entered, so compare it with the applicable provider or official rule.
Can I use decimal values in the Mortgage Extra Payment Calculator?
Yes. Decimal values are supported. Results are calculated at full JavaScript numeric precision and formatted for readability.
Are the Mortgage Extra Payment Calculator results guaranteed?
No. The calculator provides an estimate based on the entered assumptions and is not financial, tax, investment, lending, payroll, or legal advice.