Free tool

Debt Payoff Calculator

See when you'll be debt-free, how much interest you'll pay, and how much faster an extra payment gets you there.

Payoff time
3y 6m
Total interest
$4,770
With extra payment
2y 7m

Paying an extra $100/month clears this debt about 11m sooner and saves roughly $1,320 in interest.

Tip: paying highest-interest debts first (avalanche) minimizes total interest; smallest-balance first (snowball) builds momentum.

How to use it

Enter your balance, interest rate, and monthly payment to see your payoff date and total interest. Add an extra monthly payment to see how much sooner you finish and how much interest you save.

How OptiAI helps

OptiAI tracks your debts alongside your net worth and goals, so paying them down visibly moves the rest of your financial picture — and an AI assistant can help you plan the order.

Frequently asked questions

How is the payoff time calculated?

The calculator applies your monthly payment against the balance, adding monthly interest, until the balance reaches zero — then reports the number of months and total interest.

Snowball or avalanche?

Avalanche (highest interest rate first) minimizes total interest. Snowball (smallest balance first) clears individual debts faster for motivation. Both work; pick what you will stick with.

Why does my payment never pay it off?

If your monthly payment is less than the monthly interest, the balance grows instead of shrinking. Increase the payment above the monthly interest to make progress.

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