Debt Payoff Calculator

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TOOLDebt Payoff Calculator

Your Debts

NameBalanceAPR %Min Payment

Extra Monthly Payment

Amount above minimums to throw at debt each month

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About Debt Payoff Calculator

Consumer debt in the US averages $96,000 per household — credit cards, auto loans, student debt, and personal loans carrying double-digit interest rates that compound against you daily. The debt payoff calculator shows the fastest and cheapest path to debt freedom using two proven strategies: the avalanche (mathematically optimal) and the snowball (psychologically effective). It models month-by-month payoff with real interest calculations, not estimates.

How It Works

Both strategies share the same core mechanic: pay minimums on all debts, then direct every extra dollar to a single priority debt. Where they differ is the ordering rule. The avalanche method sorts debts by APR descending — highest rate gets the extra payment first. The snowball method sorts by outstanding balance ascending — smallest balance gets the extra payment first.

Each monthly simulation step: (1) Apply interest to each balance: new balance = current balance × (1 + APR/12). (2) Subtract minimum payment from each debt. (3) Apply extra payment to the priority debt. (4) When a debt reaches zero, add its minimum payment to the extra pool (the "rollover" or "snowball" effect). Repeat until all debts reach zero.

The calculator computes total interest paid across all debts, the debt-free date, and a month-by-month schedule. The avalanche method always minimizes total interest paid — sometimes dramatically. On a typical $25,000 multi-debt scenario, avalanche can save $1,500-$4,000 vs. minimum-only payments. The snowball method eliminates individual debts faster, often completing the first payoff 3-6 months earlier, which provides motivational momentum.

Who Is This For

A 32-year-old with $8,000 credit card (24% APR), $12,000 car loan (7%), and $25,000 student loan (6.5%) wants to see how $500/month extra cuts their debt-free date and total interest under both strategies.

A couple whose combined minimum payments are $1,200/month on $45,000 of consumer debt wants to find the minimum extra monthly payment needed to be debt-free before their first child starts college in 7 years.

A recent medical graduate with $180,000 in student loans at 7% wants to compare income-driven repayment (minimum-only) vs. aggressive payoff with $2,000/month extra and the total interest difference.

A small business owner with $5,000 on three different credit cards (15%, 22%, 28% APR) wants to verify that consolidating into a 12% personal loan actually saves money vs. the avalanche method.

A couple implementing the "no restaurants until debt-free" plan contributes $300/month extra — the calculator shows they can eliminate their $14,000 credit card debt in 26 months instead of 9 years on minimums.

Scope note: This calculator assumes fixed interest rates for all debts. Variable-rate debts (many HELOCs, some personal loans, adjustable credit card rates) can change unexpectedly. Minimum payments are modeled as fixed amounts; in practice, credit card minimums decrease as the balance falls (percentage-based minimums), which would slightly extend payoff time. The calculator does not account for balance transfer fees (typically 3-5%), which should be factored into the true APR when modeling consolidation.

Disclaimer: This calculator is for informational and educational purposes only and does not constitute financial, tax, or legal advice. Results are estimates based on publicly available tax slabs and formulas. Consult a qualified Chartered Accountant, tax professional, or financial advisor for guidance specific to your situation. Built and maintained by the WOWHOW Team with 14+ years of software development experience.

How to Use

Add each debt with its name, current balance, APR, and minimum monthly payment

Enter any extra monthly payment you can put toward debt above the minimums

Click "Calculate Payoff Plan" to see snowball and avalanche strategies compared

Switch between tabs to explore each strategy's timeline and schedule

Expand the monthly schedule to see exactly when each debt gets eliminated

Frequently Asked Questions

The snowball method pays off the smallest balance first for quick psychological wins, while the avalanche method targets the highest interest rate first to minimize total interest paid. Both keep paying minimums on all debts and direct extra payments to the priority debt.

The avalanche method (highest interest rate first) almost always saves more money in total interest. However, the snowball method can be more motivating because you eliminate individual debts faster, which helps many people stay committed to their payoff plan.

Any extra amount helps. Even $50-$100 per month above minimums can shave years off your debt timeline and save thousands in interest. Use this calculator to see the exact impact of different extra payment amounts on your debt-free date.

Most financial experts recommend excluding your mortgage from snowball/avalanche plans since it is a long-term, low-interest debt. Focus on higher-interest consumer debts like credit cards, personal loans, and car loans first.

The calculator simulates month-by-month payments: it applies interest to each balance, deducts minimum payments, then directs any extra payment to the priority debt (smallest balance for snowball, highest rate for avalanche). When a debt hits zero, its minimum payment rolls to the next target. The process repeats until all debts reach zero.

Credit card minimum payments are typically 1-2% of balance or $25 (whichever is higher). On a $5,000 balance at 22% APR, paying only the minimum could take 20+ years and cost $7,000+ in interest before payoff. The debt payoff calculator makes this visible by showing how dramatically an extra $100-200/month changes your debt-free date.

The math-based rule: if your debt interest rate exceeds your expected investment return, pay off debt first. High-interest debt (credit cards at 18-24%) almost always exceeds market returns (~7-10%). Low-interest debt (mortgage at 3-4%, student loans at 4-5%) may be worth carrying while investing for higher returns. The break-even comparison is: debt APR vs. after-tax investment return.

Debt consolidation (balance transfer card, personal loan, home equity loan) combines multiple debts into one at a lower rate. If you consolidate $15,000 of 22% APR credit card debt to a 10% personal loan, enter the new single debt in this calculator and compare the debt-free date and total interest vs. the original multi-debt avalanche plan. Consolidation often saves money but extends the payoff period.