Debt Payoff Calculator
Calculate how long it will take to pay off your debts. Enter multiple debts, choose the avalanche or snowball strategy, and see your debt-free date.
About This Calculator
The Debt Payoff Calculator simulates your debt repayment timeline using either the avalanche method (paying highest-interest debt first) or the snowball method (paying smallest-balance debt first). Enter multiple debts with their balances, interest rates, and minimum payments, then optionally add extra monthly payments to see how much faster you become debt-free. The calculator shows total interest paid, total amount paid, and your projected debt-free date.
How to Use
- Enter your values in the input fields above
- Click the calculate button to see results
- Review your results displayed below the inputs
- Use the reset button to clear all fields and start over
The Formula
How the calculation works under the hood
Monthly interest accrual
Each month, interest is added to the remaining balance before payments are applied.
Avalanche priority
This minimizes total interest paid over the life of all debts.
Worked Example
Step-by-step walkthrough with real numbers
“You have a $5,000 credit card at 22% APR ($150 min) and a $15,000 student loan at 6% ($200 min), with $100 extra per month using the avalanche method.”
- 1Month 1: Credit card interest = $5,000 x (0.22/12) = $91.67. Pay $150 min + $100 extra = $250.
- 2Student loan interest = $15,000 x (0.06/12) = $75.00. Pay $200 minimum.
- 3After month 1: CC balance = $4,841.67. Student loan = $14,875.
- 4Extra $100 always goes to the credit card (highest rate) until it is paid off.
- 5After CC is paid off (~24 months), redirect all CC payments ($250) to student loan.
Total payoff: approximately 60 months. Total interest saved vs. minimums only: roughly $3,200.
⚠️Common Mistakes
- ✕Only paying minimums — this extends repayment by years and multiplies interest costs.
- ✕Using the snowball method when you have a very high-rate debt — the avalanche method saves significantly more money in that situation.
- ✕Ignoring that credit card minimum payments often decrease as the balance drops, which slows payoff if you only pay the required minimum.
💡Pro Tips
- ✓Even an extra $50/month can cut years off high-interest credit card debt.
- ✓After paying off one debt, roll its entire payment amount into the next debt for accelerated payoff.
- ✓Check if your lender charges prepayment penalties before making extra payments.
Frequently Asked Questions
What is the avalanche method?
The avalanche method focuses extra payments on the debt with the highest interest rate first. This minimizes total interest paid over time.
What is the snowball method?
The snowball method targets the smallest balance first to build momentum. While it may cost more in interest, the psychological wins from eliminating debts quickly keep many people motivated.
Which method saves more money?
The avalanche method almost always saves more money in total interest. The snowball method is better for motivation and behavior change.
How does extra payment help?
Extra payments go directly toward principal, reducing the balance that accrues interest. Even $50 extra per month can shave years off repayment and save hundreds or thousands in interest.
Why is my payoff date so far away?
If you are only making minimum payments on high-interest debt, most of each payment goes toward interest rather than principal. Increasing payments even slightly can dramatically shorten the timeline.
Is this calculator free to use?
Yes! All calculators on Get Precision Calculator are completely free with no limitations or sign-up required.
Is my data saved or tracked?
No. All calculations are performed locally in your web browser. Get Precision Calculator does not store, collect, or track your calculation data.
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