Calculator
Example Data Table
| Scenario | Purchase | Upfront | Monthly Fee | Promo Months | Rate After Promo | Monthly Repayment | Months to Clear | Total Paid |
|---|---|---|---|---|---|---|---|---|
| Standard financed purchase | $2,400.00 | $300.00 | $9.95 | 6 | 25.90% | $200.00 | 12 | $2,587.26 |
| Longer promo window | $3,500.00 | $0.00 | $9.95 | 12 | 25.90% | $300.00 | 13 | $3,629.77 |
| Smaller purchase with one-off fee | $1,800.00 | $200.00 | $9.95 | 3 | 25.90% | $150.00 | 14 | $2,199.41 |
Formula Used
Starting Balance = Purchase Amount − Upfront Payment + Establishment Fee + Additional One-off Charges
Monthly Interest = Opening Balance × (Annual Interest Rate ÷ 12)
Monthly Due = Opening Balance + Monthly Fee + Monthly Interest
Repayment Used = Higher of minimum floor or chosen repayment, plus any extra repayment
Closing Balance = Monthly Due − Actual Payment
The calculator applies no interest during the selected interest-free months. After that, it applies the annual rate monthly until the balance reaches zero.
How to Use This Calculator
- Enter the purchase amount and any upfront payment.
- Add the one-off establishment fee and any extra one-off charges if they apply.
- Enter the monthly account fee and the annual interest rate used after the promotional period.
- Set the interest-free months based on your plan or retailer offer.
- Choose either a fixed monthly repayment or a target payoff period.
- Use extra monthly repayment to test faster payoff scenarios.
- Click the calculate button to view the summary, graph, and monthly repayment schedule.
- Export the results to CSV or PDF for review, sharing, or record keeping.
Frequently Asked Questions
1. What does this calculator estimate?
It estimates payoff time, monthly cash flow, interest after the promo period, recurring fees, total paid, and the balance path month by month.
2. Why is there an interest-free months field?
Some offers delay interest for a set period. This field lets you model that delay before the regular annual rate begins affecting the outstanding balance.
3. Can I use a target payoff instead of a payment amount?
Yes. Select target payoff months, enter the desired timeframe, and the calculator estimates the monthly repayment needed to finish within that period.
4. Does the tool include monthly account fees?
Yes. The schedule adds the monthly fee while a balance remains. You can change the fee anytime to reflect your account terms.
5. What happens if my payment is too low?
The tool warns you when the balance does not reduce properly. That usually means fees or interest are outpacing the selected repayment.
6. Are upfront payments useful in planning?
Yes. A larger upfront payment lowers the financed balance, which can reduce total fees, interest exposure, and the number of months needed.
7. Why export to CSV or PDF?
CSV is useful for spreadsheet work. PDF is helpful when you need a clean repayment record for clients, notes, or internal review.
8. Should I rely on the default values?
No. Use the defaults as placeholders only. Always replace them with the exact fees, rates, and promotional terms shown on your own account or offer.