Debt Payoff Calculator

Updated for 2026

Quick Answer

Compare the Avalanche and Snowball methods to pay off your debts faster. See exactly when you will be debt-free with a personalized monthly timeline. Use typical values to get quick results.

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Debt Payoff Calculator

Last updated: March 26, 2026

Struggling with debt? Our Debt Payoff Calculator allows you to see exactly how long it will take to pay off your balance and how much interest you'll pay along the way.

Strategies for Debt Freedom

Paying off debt is not just about having the money; it's about having a plan. Whether you're dealing with credit cards, personal loans, or medical bills, understanding the math is the first step toward freedom.

The Debt Payoff Formula

To determine the number of months (nn) required to pay off a balance, we use the following formula:

n=ln(1PrM)ln(1+r)n = - \frac{\ln(1 - \frac{Pr}{M})}{\ln(1 + r)}

Where:

  • PP = Principal (Current Balance).
  • rr = Monthly interest rate (Annual Rate / 12).
  • MM = Monthly payment.

Why Small Increases Matter

Even a small increase in your monthly payment can have a massive impact on your payoff date. This is because every extra dollar you pay goes directly toward the principal, reducing the amount on which interest is calculated for all future months.

Frequently Asked Questions

What happens if my monthly payment is less than the interest?

If your monthly payment (MM) is less than or equal to the interest accrued (P×rP \times r), your balance will never decrease. In fact, it will grow over time due to negative amortization. You must pay more than the interest to make progress.

Should I pay off the debt with the highest interest rate first?

This is known as the Debt Avalanche method. Mathematically, it is the most efficient way to pay off debt because it minimizes the total interest you pay. Another popular method is the Debt Snowball, where you pay off the smallest balance first to gain momentum.

How does my credit score affect my debt payoff?

A higher credit score can allow you to refinance your debt into a loan with a lower interest rate. Lowering your interest rate even by a few percentage points can save you thousands of dollars and shave months or years off your payoff timeline.