Debt Payoff Calculator
Avalanche ยท Snowball ยท Extra payments ยท Schedule
๐ Enter balances, minimums, and rates to see payoff time and interest.
How Debt Payoff Is Calculated
This debt payoff calculator simulates several balances at once. Each month every open debt accrues interest on its remaining principal, receives at least its minimum payment, and may receive extra dollars under your chosen order.
Monthly interest on each debt
Focus payment each month
What You Get From This Tool
- Avalanche mode: payoff order by highest APR first, months to debt free, and interest cost
- Snowball mode: payoff order by smallest balance first for faster early clears
- Compare both: side by side months and interest so you can see the cost of each strategy
- Extra payments: monthly extra applied after minimums to the current focus debt
- Roll option: keep total payment pressure by redirecting freed minimums after a payoff
- Chart and milestones: combined balance path and when each debt reaches zero
What Is a Debt Payoff Calculator?
A debt payoff calculator is a planning tool for clearing two or more obligations such as credit cards, personal loans, auto loans, or other revolving style balances. You enter each remaining balance, the payment you will keep current, and the APR. The tool then shows how long payoff takes, how much interest you pay, and which debt should receive extra dollars under avalanche or snowball rules.
People use it to answer questions such as how to pay off debt faster, whether avalanche or snowball saves more money, how much an extra $100 per month changes the timeline, and when each account reaches zero.
Debt avalanche explained
Avalanche ranks open debts by interest rate from high to low. You pay every minimum so accounts stay current, then send all leftover cash to the top rate. When that balance hits zero, its former payment can roll into the next highest rate if rolling is enabled. Consumer educators often prefer avalanche when the goal is the lowest total interest.
Debt snowball explained
Snowball ranks open debts by balance from small to large. Extra dollars attack the smallest balance first. Interest cost is often higher than avalanche when a large high rate balance waits longer, but clearing a small debt early can free a minimum payment and reinforce the habit of sticking to the plan.
How to use this calculator
- Add a row for each debt with a clear name, remaining balance, monthly minimum, and APR.
- Enter any extra amount you can pay every month beyond the sum of minimums.
- Choose Avalanche, Snowball, or Compare both.
- Leave Roll payments checked if you want freed minimums to stay in the payoff plan.
- Read months to debt free, total interest, payoff order, milestones, and the balance chart.
Worked example: three debts
Card A: $6,000 balance, $150 minimum, 22% APR. Card B: $3,000 balance, $75 minimum, 18% APR. Personal loan: $8,000 balance, $220 minimum, 9% APR. Extra payment: $100 per month with rolling enabled.
First month interest is about $110 on Card A, $45 on Card B, and $60 on the loan. Avalanche focuses Card A first because 22% is the highest rate. Snowball focuses Card B first because $3,000 is the smallest balance. After the focus debt clears, its minimum joins the extra pool when rolling is on, so later debts finish sooner than if payments shrink.
Extra payments and opportunity cost
Extra principal payments reduce interest because less balance remains each month. Before you redirect every spare dollar, weigh emergency savings, employer retirement matches, and any early payoff penalties on installment loans. High APR revolving balances usually deserve priority. Low APR secured debt may be less urgent than building cash reserves.
Debt consolidation in plain terms
Consolidation replaces several balances with one new loan or transfer, often at a lower rate. This calculator does not price a new loan. You can model the idea by replacing multiple rows with one combined balance and a new APR and payment, then comparing interest and months with your current multi debt plan.
Common mistakes
- Entering APR as a monthly rate instead of a yearly percent
- Setting a minimum below monthly interest so the balance never falls
- Forgetting new charges, fees, or variable rate changes
- Turning off rolling and wondering why total payments drop after each payoff
- Mixing promotional APRs with long term rates without updating rows later
When this calculator is useful
Use it to build a payoff order, size an extra payment, compare avalanche and snowball on your real numbers, and set a target debt free date. Pair it with the Credit Card Calculator for one card details and the Loan Calculator for a single installment payment.
When results may not match a lender
Installment loans often use amortization schedules with fixed payments and different day count rules. Credit cards may use average daily balance and daily rates. Fees, insurance, escrow, and payment allocation across APR buckets can change outcomes. Treat this page as an educational plan, then confirm with statements and lender disclosures.
Calculation Methodology
DoCalculation runs a month by month multi debt simulation.
- Convert each APR to a monthly rate r = APR รท 1200.
- Sort open debts by strategy (APR descending for avalanche, balance ascending for snowball).
- Each month, charge interest on every open balance, pay each minimum (capped at balance plus interest), then apply extra plus any rolled freed minimums to the current focus debt.
- When a debt reaches zero, record the milestone month. If rolling is on, add its minimum to the extra pool next month.
- Stop when all balances are cleared or after a 600 month safety limit.
Total interest is the sum of all monthly interest across debts. Total paid is the sum of all payments. The debt free date advances one calendar month per simulated payment from the selected start month.
Reference: Strategy Comparison
Sample set used as the default on this page (extra $100 / mo, rolling on):
| Debt | Balance | Min | APR |
|---|---|---|---|
| Credit card A | $6,000 | $150 | 22% |
| Credit card B | $3,000 | $75 | 18% |
| Personal loan | $8,000 | $220 | 9% |
Avalanche order: Card A โ Card B โ Loan. Snowball order: Card B โ Card A โ Loan. Live results show exact months and interest for your inputs. Market rate levels change over time; the Federal Reserve G.19 Consumer Credit release reports consumer credit measures.
Frequently Asked Questions
Sources & References
- Consumer Financial Protection Bureau โ How to reduce your debt: consumerfinance.gov blog on reducing debt
- Federal Trade Commission โ Coping with debt: consumer.ftc.gov/articles/coping-debt
- Federal Reserve โ Consumer Credit (G.19) statistical release: federalreserve.gov/releases/g19/current/
Last reviewed for methodology: 2026. Estimates on this page are for education only and are not financial advice.