Credit-Card Payoff and Debt Strategy Calculator
Compare fixed-payment, debt avalanche and debt snowball strategies with payoff time and interest.
What this calculator explains
Credit-card payoff needs a month-by-month simulation because interest accrues on changing balances and minimum-payment rules vary. Users can enter each card’s actual minimum or issuer formula rather than relying on a single assumed percentage.
Avalanche mode directs available extra payment to the highest APR, while snowball mode targets the smallest balance. The comparison explains the interest, payoff-time and account-closure trade-offs without claiming that one strategy is best for every person.
How the estimate is calculated
- Accrue monthly interest on each outstanding balance using the entered APR.
- Pay every required minimum before allocating extra budget.
- Direct extra payment to the priority account under the selected strategy.
- When one account is paid, roll its former payment into the next target.
- Continue until all balances reach zero or the model detects an unaffordable payment.
- Compare total interest, payoff month and account-closure sequence.
Formula
Monthly card interest is estimated from balance × APR ÷ 12; strategy affects where payment above minimums is directed
Worked example
Consider three cards: $5,000 at 24%, $3,000 at 18% and $2,000 at 0%, with a total monthly budget of $500 and entered minimums of $125, $75 and $50. In an illustrative month-by-month model with no new charges, the avalanche strategy pays the debt in about 24 months with roughly $1,651 interest, while the snowball takes about 25 months with roughly $2,419 interest. Actual results depend on issuer rules and promotional-rate changes.
Current rules and configuration notes
- The calculator uses a month-by-month balance simulation because interest and minimum payments change over time.
- Avalanche mode sends available extra payment to the highest APR; snowball mode targets the smallest balance.
- Issuer minimum-payment rules must be entered or selected; one universal minimum formula must not be assumed.
Update requirement: The simulation is evergreen. Consumer-support links and educational guidance should be checked periodically.
Included in the estimate
- Multiple cards or revolving debts
- Minimum-only, avalanche, snowball and custom priority
- Promotional APR period
- Debt-free date and estimated interest
- Month-by-month payment plan
- Warnings when the budget does not cover required minimums
Not included or not guaranteed
- Late fees, penalty APRs or new charges unless entered
- Issuer-specific daily compounding and statement timing
- Credit-score effects
- Debt settlement, bankruptcy or legal advice
- A guarantee that a creditor will accept the modeled payment
Frequently asked questions
What is the debt avalanche method?
It directs extra payment to the highest-interest debt while maintaining minimums on the others, then rolls the freed payment forward.
What is the debt snowball method?
It directs extra payment to the smallest balance first, regardless of APR, so accounts may close earlier.
Which method saves more interest?
The avalanche generally saves more when all other assumptions remain equal, but the exact result depends on balances, APRs and payments.
Why does my issuer’s payoff quote differ?
Credit cards may accrue interest daily, use statement cycles and include pending charges or fees. The calculator is a planning estimate.
Should I include new purchases?
For a clear payoff plan, set new charges to zero. If charges continue, enter them explicitly so the model does not understate the timeline.
What if my budget is below the minimum payments?
The calculator displays an immediate warning and directs the user to contact issuers or a reputable nonprofit credit counsellor rather than producing a false payoff date.
Official sources
Applicable period: 2026 · Last reviewed: September 3, 2026
Display the applicable period and a real Last reviewed date beside this source list.
Recommended internal links
Create a payment schedule you can follow
Export the month-by-month plan and set a reminder to update balances after every statement.
CTA destination: /us/debt/credit-card-payoff-calculator/