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Mortgage Prepayment Calculator

Result

Calculated result -1 Based on the values entered.
↗ Finance

Mortgage Prepayment Calculator — free online calculator.

Formula

New balance = Balance − Lump sum, keeping the same payment shortens the remaining term
  • Mortgage Prepayment Calculator calculates its result from Balance, Lump Sum. It uses the formula New balance = Balance − Lump sum, keeping the same payment shortens the remaining term. Change any input to recalculate the result instantly.
  • The main inputs are Balance, Lump Sum. Enter them in the units and format shown in the calculator.
  • Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Mortgage Prepayment

Inputs
  • Balance: 2
  • Lump Sum: 3

Using Balance = 2, Lump Sum = 3, the calculated result is -1.

Sample result: Calculating…

Frequently asked questions

What does the Mortgage Prepayment calculate?

Mortgage Prepayment Calculator — free online calculator.

Which values should I enter?

Enter Balance, Lump Sum using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: New balance = Balance − Lump sum, keeping the same payment shortens the remaining term.

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026