Debt avalanche planner
Debt Payoff Calculator
Combine several debts, add an extra monthly amount and estimate the debt-free timeline using a highest-rate-first strategy.
✓ Private✓ No registration✓ Browser-based✓ Educational estimates
Enter up to three debts
Use current balances, annual interest rates and minimum monthly payments.
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Your calculation in plain English
What this debt payoff calculator does
This calculator estimates the time and interest required to clear up to three debts using a debt avalanche strategy. Minimum payments continue on every balance, and the extra monthly amount is directed to the debt with the highest annual interest rate. When one debt is cleared, its payment is rolled into the next debt.
The result can help you compare minimum-only repayment with a more aggressive plan. It does not include late fees, changing rates or new borrowing.
How the debt avalanche works
At the start of each month, interest is added to every balance. Minimum payments are made, then the extra amount and any payment released from cleared debts are directed to the highest-rate remaining balance. This sequence is repeated until all debts are repaid.
The avalanche method generally minimises interest because it attacks the most expensive balance first. The debt snowball, by contrast, targets the smallest balance to create quicker visible wins. Motivation matters, so the mathematically cheapest method is not always the easiest method to follow.
How to interpret the results
The debt-free time is the number of months required under the accelerated plan. Total interest is the sum paid across all debts. Interest saved compares the accelerated plan with continuing only the current minimum payments.
If a minimum payment does not cover monthly interest, the calculator warns through an unrealistic or extended result. In practice, contact the lender or a qualified debt adviser if balances are growing despite payments.
Common mistakes
- Continuing to add new balances while following the plan.
- Using minimum payments that may fall over time without updating the model.
- Ignoring fees, promotional-rate expiry or variable rates.
- Keeping no emergency buffer and then relying on credit again.
- Choosing a strategy that is mathematically efficient but emotionally unsustainable.
Frequently asked questions
What is the debt avalanche method?
It directs extra payments to the highest-interest-rate debt while maintaining minimums on the others.
What is the debt snowball method?
It targets the smallest balance first to create faster account closures.
Which method saves more interest?
The avalanche generally saves more when all other factors are equal.
Does the calculator roll payments forward?
Yes. Payments freed by a cleared debt are added to the next target.
What if a payment is less than monthly interest?
The debt may not amortise. Increase the payment or seek support.
Are fees included?
No. Add them to balances or adjust assumptions if material.
Should I invest while paying debt?
High-interest debt repayment often deserves priority, but individual circumstances differ.
How can I stay motivated?
Automate payments, track milestones and choose a method you can follow consistently.
Continue your financial journey
Financial disclaimer: This calculator and guide are provided for educational information only. They do not constitute financial, investment, tax or legal advice. Actual outcomes will vary.