Calculator Inputs
Tip: Use strategy fee for transfer fees, consolidation charges, or any one-time cost tied to your faster repayment plan.
Example Data Table
| Scenario | Balance | APR | Payment | Extra Payment | Lump Sum | Estimated Outcome |
|---|---|---|---|---|---|---|
| Starter debt reduction plan | $8,500 | 24.99% | $250 | $150 | $500 | Lower interest and faster payoff |
| High-interest revolving balance | $12,000 | 29.99% | $320 | $200 | $0 | Large savings from sustained overpayments |
| Promo rate with fee | $6,200 | 21.50% | $225 | $125 | $300 | Check fee against projected interest saved |
Formula Used
1) Effective monthly rate
Monthly basis: APR / 12
Daily basis: (1 + APR / 365) ^ cycleDays - 1
2) Monthly interest
Interest = Starting Balance × Effective Monthly Rate
3) Ending balance
Ending Balance = Starting Balance + Interest + New Charges - Payment - Lump Sum
4) Gross interest savings
Current Plan Total Interest - Faster Plan Total Interest
5) Net total paid difference
Current Plan Total Paid - Faster Plan Total Paid
This faster plan total includes any strategy fee you enter.
How to Use This Calculator
- Enter your current card balance and regular APR.
- Add your normal monthly payment amount.
- Enter any extra monthly payment you can sustain.
- Add a one-time lump sum if you plan one.
- Include monthly new charges if the balance is still active.
- Use promotional APR and months only if they apply.
- Add any one-time strategy fee to test real savings.
- Submit the form to compare payoff time, interest, and balances.
- Review the chart and monthly table.
- Download the results as CSV or PDF for later use.
Frequently Asked Questions
1. What does this calculator estimate?
It compares your current payment plan with a faster payoff plan. It estimates interest costs, months to payoff, total paid, and savings from extra payments or a lump sum.
2. Why include monthly new charges?
Many balances stay active while people repay debt. Adding new charges shows whether your payment plan still reduces the balance or keeps the debt revolving longer.
3. What is the strategy fee field for?
Use it for transfer fees, setup fees, or any one-time cost tied to your faster payoff approach. It helps show whether the plan still creates meaningful savings.
4. Does this replace lender statements?
No. Card issuers may use average daily balance methods, variable APR changes, rounding rules, and fees that differ from a simplified estimate. Treat this as a planning tool.
5. What if the balance never pays off?
That usually means the payment is too small compared with interest and new charges. Raise the payment, reduce spending on the card, or apply a lump sum.
6. Why can daily and monthly results differ?
Daily-based interest compounds more closely to many real card calculations. Monthly-based interest is simpler. The difference becomes more noticeable with high APRs and longer balances.
7. Can I use this for a promotional APR period?
Yes. Enter the promotional APR and how many months it lasts. After that period, the calculator switches back to your regular APR for remaining months.
8. What is the most useful result to watch?
Focus on total interest saved, months saved, and whether the faster plan truly lowers total paid after fees. Those three metrics show the clearest repayment benefit.