CALCULATE WITH CONFIDENCE

Finance · Mortgages & Home Finance

Mortgage Prepayment Penalty Calculator

Total user-entered percentage, fixed, and interest-based contractual prepayment components.

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Understand the home-finance decision

What the Mortgage Prepayment Penalty Calculator is for

Total user-entered percentage, fixed, and interest-based contractual prepayment components.

It keeps the property value, balance, cash amounts, rate convention, payment timing, and comparison horizon visible so the result can be checked against an actual quote, statement, budget, or contract.

Calculation structure

Follow the money through time

Visual explanation

See which inputs change the result

Read the estimate correctly

Use the result with its assumptions

On a 100,000 balance, a 2% component is 2,000, a fixed charge is 500, and three months of interest at 6% is 1,500, totaling 4,000.

Contracts use specific or alternative methods. Enter only components that your contract actually combines; this is not a legal interpretation.

Quick guide

How to use this calculator

  1. Enter the contractual or scenario values requested by each label.
  2. Keep amounts in one currency and use the whole-period unit shown on each label.
  3. Review every result with the stated exclusions.

Calculation method

Calculation method

Total = balance × percentage + fixed charge + balance × nominal annual rate ÷ 12 × entered interest months.

The engine retains calculation precision and rejects invalid or numerically unreliable schedules.

Worked example

Scenario example

On a 100,000 balance, a 2% component is 2,000, a fixed charge is 500, and three months of interest at 6% is 1,500, totaling 4,000.

Total = balance × percentage + fixed charge + balance × nominal annual rate ÷ 12 × entered interest months.

Supported inputs

Precision and limits

Visible limits

Amounts are capped at 1e12, entered rates at 1000%, periods at 1,200 months or 100 years, and fixed decimals at 12 places. A derived ARM rate above 1000% is rejected.

International scope

No jurisdiction, currency, tax, insurance, index path, lender rule, or legal interpretation is assumed.

Not a quotation

Results are mathematical scenarios based only on entered terms.

Specific assumptions

Contracts use specific or alternative methods. Enter only components that your contract actually combines; this is not a legal interpretation.