Enter your debt details
The page uses a single-column flow, while the input fields adapt to three columns on large screens, two on tablets, and one on phones.
Example data table
Use this sample scenario to see how faster repayment changes your debt-free date and total interest.
| Scenario | Balance | APR | Scheduled Payment | Extra Payment | Lump Sum | Lump Sum Period | Frequency |
|---|---|---|---|---|---|---|---|
| Baseline plan | $18,000 | 18.90% | $450 | $0 | $0 | 0 | Monthly |
| Accelerated plan | $18,000 | 18.90% | $450 | $100 | $1,500 | 6 | Monthly |
| Biweekly strategy | $9,500 | 14.50% | $180 | $25 | $500 | 8 | Biweekly |
Formula used
The calculator uses amortization math for each payment period and then advances the schedule until the closing balance reaches zero.
When you add extra recurring payments or a one-time lump sum, the calculator compares the faster strategy against a baseline schedule without those accelerators.
How to use this calculator
- Enter your current balance and any fees already added to the debt.
- Type your annual interest rate and your planned payment amount.
- Add an optional recurring extra payment for a faster payoff path.
- Add a lump sum and the period when you expect to apply it.
- Choose monthly, biweekly, or weekly payments to match your plan.
- Enter your first payment date and optional monthly income for burden metrics.
- Press the calculate button to show the result above the form.
- Use the CSV button for spreadsheet review or the PDF button for a shareable report.
Frequently asked questions
1. What does the debt-free date mean?
It is the projected payment date when your remaining balance reaches zero, based on the interest rate, payment amount, frequency, and any extra reductions you entered.
2. Why does a higher payment change interest so much?
A larger payment reduces principal earlier. That leaves less balance for future interest calculations, which can shorten the payoff schedule and lower total borrowing cost.
3. Can I use this for credit cards and personal loans?
Yes. It works best for debts with a stated APR and consistent payment timing. Variable-rate products may need updated inputs whenever the rate changes.
4. What is the difference between extra payment and lump sum?
An extra payment repeats every period. A lump sum is a one-time principal reduction applied on the specific period you choose in the form.
5. Why does the calculator reject a low payment?
If your payment does not exceed the interest charged each period, the debt will not shrink. The page warns you because the balance would never amortize.
6. Does payment frequency matter?
Yes. Weekly and biweekly schedules divide the annual rate across more periods. That changes how often interest accrues and when principal gets reduced.
7. What does payment burden ratio show?
It estimates how much of your monthly take-home income goes toward this debt plan, using a monthly equivalent of your selected payment frequency.
8. Can I save the results?
Yes. Download the amortization schedule as CSV for analysis, or export the visible report as PDF for meetings, records, or repayment planning.