Debt Payoff Calculator

How It Works

The calculator simulates the debt month by month using your balance, annual rate, planned payment, and extra payment. Each month it adds interest to the remaining balance, applies the payment, and repeats until the debt reaches zero. It also compares the result with and without extra payments to estimate interest savings.

Example

If you owe $25,000 at 8.5% and pay $600 plus an extra $100 every month, the debt finishes much sooner than paying only $600. The tool shows the estimated payoff time, total interest, total paid, and the interest saved from that extra amount.

When to use this calculator

• Use it when you want to know how long one debt could take to finish under a realistic monthly payment plan.
• Use it to test whether extra payments are worth the trade-off against other goals such as savings or emergency cash.
• Use it before refinancing discussions so you understand the scale of time and interest you are trying to improve.

Best uses for this estimate

• Test whether a higher monthly payment meaningfully shortens payoff time.
• Compare a comfortable plan versus an aggressive plan.
• See whether a small recurring extra payment is worth prioritizing in your budget.

Before acting on the result

• Check whether your real debt includes fees or penalty rules that this simple model does not cover.
• Avoid stripping your cash buffer to zero just to force a faster payoff timeline.
• If several debts exist, compare payoff order strategies separately.

Important limitations

• This tool assumes one balance, one fixed rate, and one fixed monthly payment path.
• It does not include compounding quirks, penalty fees, or variable-rate resets.
• It is a planning model, not a legal statement or lender payoff quote.