Debt Payoff Calculator

How to Use This Calculator

1. Enter each debt — name, current balance, interest rate (APR), and minimum monthly payment. Click "+ Add Debt" for additional debts.
2. Set your extra payment — any amount you can afford above your total minimums. Even $50/month makes a significant difference.
3. Choose a strategy — Avalanche targets the highest interest rate first (saves the most money). Snowball targets the smallest balance first (fastest emotional wins).
4. Compare results — the summary shows your debt-free date, total interest, and how much you save versus paying only minimums.
5. Visualize your journey — the stacked area chart shows how each debt shrinks over time, and the payoff order shows which debts you'll eliminate first.

Snowball vs. Avalanche: Which Method Is Better?

The two most popular debt repayment strategies are the debt avalanche and the debt snowball. Both methods make minimum payments on all debts, then focus any extra money on one target debt at a time. The difference is how they choose the target.

The Avalanche Method

The avalanche method targets the debt with the highest interest rate first. This is mathematically optimal — it minimizes the total interest you pay over the life of all your debts. If you have a credit card at 22% and a student loan at 6%, the avalanche method attacks the credit card first regardless of balance size.

The Snowball Method

The snowball method targets the debt with the smallest balance first. While it costs slightly more in total interest, research by Harvard Business School found that people using the snowball method are more likely to eliminate all their debt. The quick wins of paying off smaller debts create motivation and momentum.

Which Should You Choose?

If your debts have similar interest rates, snowball is usually better because the motivation factor outweighs the small interest difference. If you have one debt with a significantly higher rate (like a 22% credit card alongside 5% loans), avalanche saves you enough money to justify the slower emotional wins. Use this calculator to compare both — the interest saved amount tells you the exact cost of choosing snowball over avalanche.

The Power of Extra Payments

Extra payments are the single most powerful tool for accelerating debt repayment. Here's why: when you make only minimum payments, most of your money goes to interest. A $5,000 credit card at 22% APR with a $150 minimum payment takes over 4 years to pay off, and you'll pay $2,500+ in interest — almost half the original balance again.

Adding just $100/month extra drops that to under 2.5 years and saves over $1,200 in interest. The math is dramatic because extra payments reduce principal directly, which means less interest accrues the following month, which means more of your next payment goes to principal. It's compound interest working in your favor.

Where to find extra money: review subscriptions you don't use, negotiate bills (insurance, phone, internet), sell items you don't need, or redirect windfalls (tax refunds, bonuses) to debt. Even temporary side income can make a massive difference when applied consistently to your target debt.

Frequently Asked Questions

What is the difference between the snowball and avalanche methods?

The avalanche method pays off debts with the highest interest rate first, saving you the most money in total interest. The snowball method pays off the smallest balances first, giving you quick wins that build motivation. Mathematically, avalanche always saves more money, but snowball has higher completion rates because the psychological momentum keeps people on track.

How do extra payments help pay off debt faster?

Extra payments go directly to reducing principal on your target debt (the highest-rate debt in avalanche, or smallest balance in snowball). This reduces the interest that accrues each month, creating a compounding effect. Even $50-100 extra per month can save thousands in interest and shave years off your payoff timeline.

Should I pay off debt or save money first?

Financial experts generally recommend building a small emergency fund ($1,000-2,000) first, then aggressively paying off high-interest debt (above 7-8%). Once high-interest debt is cleared, split between saving and paying off lower-interest debt. The key is that high-interest debt grows faster than most investments earn.

What happens when I pay off one debt?

When you pay off one debt, the minimum payment you were making on that debt gets added to your extra payment budget and applied to the next target debt. This creates a 'snowball' effect where your payments get larger as each debt is eliminated, dramatically accelerating the payoff of remaining debts.

How much should I put toward extra debt payments?

A common guideline is to allocate 20% of your take-home pay toward debt repayment (including minimums). Anything above minimums counts as extra. Even small amounts matter: $100/month extra on a $10,000 debt at 20% APR saves over $4,000 in interest and pays it off 3+ years earlier.

Is it better to consolidate debt or use the avalanche method?

Debt consolidation makes sense if you can get a significantly lower interest rate (e.g., combining 20%+ credit card debt into a 7% personal loan). The avalanche method is better when you can't lower rates but want to optimize your payment order. Sometimes both strategies work together: consolidate what you can, then avalanche the rest.

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