💳 Debt Avalanche Calculator
Prioritize high-interest debts to save money and become debt-free faster
Add Your Debts
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Repayment Settings
Amount you can pay beyond minimums each month
Check your debt terms for the correct frequency
How to Use This Tool
Follow these steps to generate an accurate debt avalanche repayment plan:
- Add each of your debts using the "Add Debt" button. Include the debt name, current balance, annual interest rate, and minimum monthly payment.
- Enter any extra monthly payment you can allocate toward debt repayment beyond minimum requirements.
- Select the interest compounding frequency for your debts (most consumer debts use monthly compounding).
- Click "Calculate Repayment Plan" to view your debt-free timeline and interest savings.
- Use the "Reset All" button to clear all inputs and start a new calculation.
Formula and Logic
The debt avalanche method prioritizes repaying debts with the highest annual interest rates first, while making minimum payments on all other debts. This minimizes the total interest paid over time compared to other methods like the debt snowball.
Our calculation uses the following logic:
- Debts are sorted in descending order of annual interest rate (highest rate first).
- Each month, interest is accrued on all remaining debt balances based on the selected compounding frequency.
- Minimum payments are applied to all debts first.
- Any extra monthly payment is applied entirely to the highest-interest debt with a remaining balance.
- The simulation runs month-to-month until all debt balances reach zero.
Monthly interest rates are derived from annual rates based on your selected compounding frequency:
- Monthly compounding: Annual rate / 12
- Daily compounding: Effective monthly rate calculated using (1 + (annual rate / 365))^30 - 1
- Quarterly compounding: Effective monthly rate calculated using (1 + (annual rate / 4))^(1/3) - 1
Practical Notes
Keep these finance-specific tips in mind when using this calculator:
- High-interest debts (like credit cards) accrue interest faster, so prioritizing them first saves the most money over time.
- Ensure your minimum payments are high enough to cover monthly interest accrual, or your debt balance will grow even with payments.
- Extra payments as small as $50–$100 per month can significantly reduce your total interest and repayment timeline.
- Compounding frequency varies by debt type: credit cards often use daily compounding, while student loans and mortgages typically use monthly or quarterly compounding.
- Revisit your plan quarterly to adjust for changes in income, expenses, or interest rates.
Why This Tool Is Useful
The debt avalanche method is mathematically the most cost-effective way to repay multiple debts. This tool helps you:
- Visualize exactly how much time and money you save by prioritizing high-interest debts.
- Plan your monthly budget by understanding exactly how extra payments impact your timeline.
- Track progress toward becoming debt-free with clear payoff dates for each individual debt.
- Avoid overpaying interest by comparing your plan to a minimum-only payment scenario.
Frequently Asked Questions
Is the debt avalanche method better than the debt snowball?
The debt avalanche saves more money in total interest, as it targets high-rate debts first. The debt snowball prioritizes small balances first for psychological wins, but costs more in interest over time. Choose avalanche if minimizing cost is your top priority.
What if my extra payment amount changes each month?
Use an average of your expected extra monthly payments, or run multiple calculations with different extra payment amounts to see the range of possible outcomes. Consistency with extra payments will always shorten your repayment timeline.
Does this calculator account for tax-deductible interest?
No, this tool calculates total interest paid before tax considerations. If you have tax-deductible debts (like some student loans or mortgages), subtract the tax deduction from your total interest paid to find your after-tax cost.
Additional Guidance
For best results, pair this calculator with a monthly budget that allocates a fixed amount to debt repayment. Avoid taking on new high-interest debt while using the avalanche method, as this will offset your progress. If you have a mix of high and low interest debts, consider refinancing high-rate debts to lower rates before starting your avalanche plan to save even more. Regularly review your credit reports to ensure interest rates and balances are accurate for your calculations.