Portfolio SimulatorPortfolio Simulator
Portfolio Simulator
Tools
LoanPayoff GoalRefinanceInvest vs. Debt
Payoff Goal

Solve for the monthly extra payment needed to hit a target payoff month.

Refinance

Compare payment savings, closing costs, break-even time, and lifetime cost.

Invest vs. Debt

Compare recurring and one-time extra principal with investing the same cash.

Want the exact calculation rules?

See the payment formula, cent-rounding convention, extra-payment order, and model limits.

Loan methodology

Portfolio Simulator is an educational scenario modeling tool.

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