Debt Payoff Calculator
Total-debt payoff time and interest from aggregate balance, average rate, and monthly payment.
How to Use
- Add up all your outstanding debt balances (credit cards, personal loans, medical, store cards) and enter the total.
- Use a weighted-average APR across your debts — higher-balance accounts contribute more to the average.
- Enter the total monthly amount you can put toward all debts combined.
- Read the payoff time in months and the total interest you'll pay over that period.
- Watch for the warning if your payment is at or below the monthly interest charge — in that case the balance grows.
- For multi-account strategy (snowball or avalanche), use this tool for the aggregate forecast then plan per-account allocation separately.
Methods
Frequently Asked Questions
Should I use snowball or avalanche?
<strong>Avalanche</strong> (highest APR first) saves the most money mathematically. <strong>Snowball</strong> (smallest balance first) builds psychological momentum because you eliminate accounts faster — which most people find more motivating. Studies suggest snowball has a higher completion rate. Pick whichever you'll actually stick with; consistency beats optimization.
How do I find a weighted-average APR?
Sum (balance × APR) across all debts, then divide by total balance. Example: $5,000 @ 20% + $10,000 @ 8% → ($5,000 × 0.20 + $10,000 × 0.08) / $15,000 = $1,800 / $15,000 = 12%. Don't just average the APRs — that gives the wrong answer when balances differ.
What if I get a windfall (tax refund, bonus)?
Apply it to the highest-rate balance (avalanche) or the smallest balance (snowball, if it would eliminate that account). Don't split it across all debts proportionally — concentration accelerates payoff much faster than spreading.
When should I consider debt consolidation?
When you can lock in a meaningfully lower interest rate (personal loan at 8% replacing 20%+ credit card debt) AND you have the discipline not to immediately re-run up the cards. Balance transfer cards offer 0% promotional periods (12–21 months); they save the most if you can pay off during the promo. They're traps if you can't.
Should I keep some emergency fund or pay debt aggressively?
General advice: keep $1,000–$2,000 minimum emergency fund, then pay debt aggressively, then build a 3–6 month emergency fund. Fully draining your emergency fund to pay debt often backfires because the next minor crisis (car repair, medical bill) goes back on credit cards at 20%+ APR.
What about debt settlement and bankruptcy?
Debt settlement (negotiating to pay less than owed) and bankruptcy are legitimate options for severe situations but seriously damage credit and have tax implications. For most consumer debt, an aggressive payoff plan is achievable with budget cuts. Consult a non-profit credit counselor (NFCC.org) before considering settlement or bankruptcy — they offer free guidance.
Common Use Cases
Calibrating an aggressive payoff plan
Find out exactly how long it takes to be debt-free at your current payment level — often a useful motivator.
Comparing payment levels
See the dramatic difference between a $500 vs. $750 vs. $1,000 monthly payment — every extra $100 typically cuts months off the payoff.
Evaluating a consolidation loan
Compare your current debts at their average APR vs. a single consolidation loan at a lower rate — see the actual interest savings before making the decision.
Setting a debt-free target date
Pick a date (your kid's college, your retirement, your wedding) and work backward to find the monthly payment needed.
Annual financial review
Run the numbers each January with your current balances and APRs to update your plan for the year.
Coordinated couples planning
Combine both partners' debts to plan a household-level payoff strategy.
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