Debt Payoff Calculator
See exactly how long it will take to become debt-free, how much interest you will pay and the date you will be done. Enter a single balance or a whole list of debts, pick the snowball or avalanche method, set your monthly budget, and this calculator projects your payoff plan entirely in your browser.
What is a debt payoff calculator?
A debt payoff calculator is a tool that projects how long it will take to clear one or more debts and how much interest you will pay. It uses standard amortization: each month, interest is added to what you owe, your payment is subtracted, and the balance slowly shrinks. When you pay more than the monthly interest, some of each payment goes toward the principal, and the debt eventually reaches zero.
The two most common strategies are the snowball and avalanche methods. The snowball method directs extra money to your smallest balance first, which feels motivating because a whole debt disappears sooner. The avalanche method targets your highest interest rate first, which usually saves the most money. This calculator handles both, for a single debt or a whole list, and gives you three answers that matter: the payoff time, the payoff date and the total interest you will pay. Everything runs locally in your browser, so your finances stay private.
How to use
- Pick a tab: Single debt for one balance, or Multiple debts for a whole list.
- Enter the balance, annual interest rate and monthly payment, plus an optional extra payment.
- On Multiple debts, add each debt and set a total monthly budget and a method.
- Click Calculate payoff to see your payoff time, date, interest and total paid.
Example
A $10,000 credit card at 18% APR with a $300 monthly payment is paid off in about 47 months (3 years 11 months) with roughly $3,967 in interest. Add a $100 extra each month and it falls to about 32 months (2 years 8 months) and around $2,628 in interest — saving over $1,300 and almost 15 months.
Common use cases
- Planning a credit card payoff and seeing how much extra payment saves you.
- Choosing between the snowball and avalanche methods for a list of debts.
- Deciding whether a debt consolidation or balance transfer is worth it.
- Setting a monthly budget that gets you debt-free by a target date.
Pro tips
- Pay at least the monthly interest, or the balance will grow instead of shrink.
- The avalanche usually saves the most interest; the snowball keeps motivation high.
- Even a small extra payment each month is powerful because it compounds in your favor.
- Use the payoff date to set a realistic goal, then automate the payment to hit it.
FAQ
How do I calculate how long it takes to pay off debt?
This calculator runs each month of a loan: it adds the monthly interest to your balance and subtracts your payment, repeating until the balance reaches zero. The number of months is your payoff time.
What is the difference between the snowball and avalanche methods?
The snowball method pays the extra money toward the smallest balance first for quick wins, while the avalanche targets the highest interest rate first to save the most in interest.
How does an extra payment affect my payoff time?
Adding extra each month pays down principal faster, so the debt ends sooner and accrues less interest. A $100 extra payment can shave years off a large credit card balance.
How do I calculate the total interest I will pay?
The tool adds up the interest charged each month. Your total interest plus the original principal equals the total you will pay over the life of the debt.
How is the payoff date calculated?
The payoff date is the current date plus the number of months the calculator finds you need to clear the balance. The date shifts if you start later or change your payment.
Should I pay off credit card or a loan first?
Usually pay the highest interest rate first, because it costs you the most. The avalanche method does this automatically; the snowball method prioritizes smaller balances instead.
What happens if I only pay the minimum?
Paying only the minimum stretches the debt for many years and you pay far more interest. Raising the payment dramatically shortens the payoff time.
Why won't a payment that is too small ever pay off the debt?
If your payment is less than the monthly interest, the balance grows instead of shrinking. This calculator flags that case, meaning the debt will never be paid off at that payment level.
Does this debt payoff calculator work for multiple debts?
Yes. Add all your debts with their balances, interest rates and minimum payments, then set a total monthly budget. The tool applies the extra to the target debt using your chosen method.
Is this debt payoff calculator free and private?
Yes. It is completely free, runs entirely in your browser, and nothing you enter is uploaded.
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