Inputs
Example data
| Principal | APR % | Term | Made | Extra | |
|---|---|---|---|---|---|
| 25,000 | 6.5 | 60 | 12 | 50 | |
| 15,000 | 4.2 | 48 | 18 | 0 | |
| 40,000 | 7.9 | 72 | 24 | 150 |
Results
Original payment
$489.15
Balance now
$20,626.38
Months left (no extra)
48
Months left (with extra)
43
Interest remaining (no extra)
$2,852.99
Interest remaining (with extra)
$2,550.06
Payoff date (no extra)
2029-12-25
Payoff date (with extra)
2029-07-25
Days to payoff (no extra)
1430
Days to payoff (with extra)
1277
Months saved by extra
5
Note
Per-row dates reflect the selected interval. For "Every N days", interest per period uses daily compounding:
r = (1 + APR/365)N − 1.
| # | Payment Date | Payment | Interest | Principal | Remaining | Cumulative Interest |
|---|---|---|---|---|---|---|
| 13 | 2026-01-25 | 539.15 | 111.73 | 427.43 | 20,198.96 | 111.73 |
| 14 | 2026-02-25 | 539.15 | 109.41 | 429.74 | 19,769.21 | 221.14 |
| 15 | 2026-03-25 | 539.15 | 107.08 | 432.07 | 19,337.14 | 328.22 |
| 16 | 2026-04-25 | 539.15 | 104.74 | 434.41 | 18,902.73 | 432.96 |
| 17 | 2026-05-25 | 539.15 | 102.39 | 436.76 | 18,465.97 | 535.35 |
| 18 | 2026-06-25 | 539.15 | 100.02 | 439.13 | 18,026.84 | 635.38 |
| 19 | 2026-07-25 | 539.15 | 97.65 | 441.51 | 17,585.33 | 733.02 |
| 20 | 2026-08-25 | 539.15 | 95.25 | 443.90 | 17,141.43 | 828.28 |
| 21 | 2026-09-25 | 539.15 | 92.85 | 446.30 | 16,695.13 | 921.13 |
| 22 | 2026-10-25 | 539.15 | 90.43 | 448.72 | 16,246.40 | 1,011.56 |
| 23 | 2026-11-25 | 539.15 | 88.00 | 451.15 | 15,795.25 | 1,099.56 |
| 24 | 2026-12-25 | 539.15 | 85.56 | 453.60 | 15,341.66 | 1,185.12 |
| 25 | 2027-01-25 | 539.15 | 83.10 | 456.05 | 14,885.60 | 1,268.22 |
| 26 | 2027-02-25 | 539.15 | 80.63 | 458.52 | 14,427.08 | 1,348.85 |
| 27 | 2027-03-25 | 539.15 | 78.15 | 461.01 | 13,966.07 | 1,426.99 |
| 28 | 2027-04-25 | 539.15 | 75.65 | 463.50 | 13,502.57 | 1,502.64 |
| 29 | 2027-05-25 | 539.15 | 73.14 | 466.01 | 13,036.55 | 1,575.78 |
| 30 | 2027-06-25 | 539.15 | 70.61 | 468.54 | 12,568.01 | 1,646.40 |
| 31 | 2027-07-25 | 539.15 | 68.08 | 471.08 | 12,096.94 | 1,714.47 |
| 32 | 2027-08-25 | 539.15 | 65.53 | 473.63 | 11,623.31 | 1,780.00 |
| 33 | 2027-09-25 | 539.15 | 62.96 | 476.19 | 11,147.11 | 1,842.96 |
| 34 | 2027-10-25 | 539.15 | 60.38 | 478.77 | 10,668.34 | 1,903.34 |
| 35 | 2027-11-25 | 539.15 | 57.79 | 481.37 | 10,186.97 | 1,961.13 |
| 36 | 2027-12-25 | 539.15 | 55.18 | 483.97 | 9,703.00 | 2,016.31 |
| 37 | 2028-01-25 | 539.15 | 52.56 | 486.60 | 9,216.40 | 2,068.86 |
| 38 | 2028-02-25 | 539.15 | 49.92 | 489.23 | 8,727.17 | 2,118.79 |
| 39 | 2028-03-25 | 539.15 | 47.27 | 491.88 | 8,235.29 | 2,166.06 |
| 40 | 2028-04-25 | 539.15 | 44.61 | 494.55 | 7,740.74 | 2,210.67 |
| 41 | 2028-05-25 | 539.15 | 41.93 | 497.22 | 7,243.52 | 2,252.59 |
| 42 | 2028-06-25 | 539.15 | 39.24 | 499.92 | 6,743.60 | 2,291.83 |
| 43 | 2028-07-25 | 539.15 | 36.53 | 502.63 | 6,240.98 | 2,328.36 |
| 44 | 2028-08-25 | 539.15 | 33.81 | 505.35 | 5,735.63 | 2,362.16 |
| 45 | 2028-09-25 | 539.15 | 31.07 | 508.09 | 5,227.54 | 2,393.23 |
| 46 | 2028-10-25 | 539.15 | 28.32 | 510.84 | 4,716.70 | 2,421.55 |
| 47 | 2028-11-25 | 539.15 | 25.55 | 513.60 | 4,203.10 | 2,447.10 |
| 48 | 2028-12-25 | 539.15 | 22.77 | 516.39 | 3,686.71 | 2,469.86 |
| 49 | 2029-01-25 | 539.15 | 19.97 | 519.18 | 3,167.53 | 2,489.83 |
| 50 | 2029-02-25 | 539.15 | 17.16 | 522.00 | 2,645.53 | 2,506.99 |
| 51 | 2029-03-25 | 539.15 | 14.33 | 524.82 | 2,120.71 | 2,521.32 |
| 52 | 2029-04-25 | 539.15 | 11.49 | 527.67 | 1,593.04 | 2,532.81 |
| 53 | 2029-05-25 | 539.15 | 8.63 | 530.52 | 1,062.52 | 2,541.44 |
| 54 | 2029-06-25 | 539.15 | 5.76 | 533.40 | 529.12 | 2,547.19 |
| 55 | 2029-07-25 | 531.98 | 2.87 | 529.12 | 0.00 | 2,550.06 |
Formula used
Monthly rate: r = APR / 12 / 100. Original fixed payment (no extra):
A = P · r / (1 − (1 + r)−n) (if r > 0) A = P / n (if r = 0)
Remaining balance after k payments when paying the original A:
Bk = P · (1 + r)k − A · [((1 + r)k − 1) / r]
For non‑monthly projections with period length N days, we apply daily compounding per period:
rperiod = (1 + APR/365)N − 1
The schedule from the current balance uses payment = A + extra at each period until the balance reaches zero.
How to use this calculator
- Enter the original loan details and months already paid.
- Choose your next payment date and the payment interval.
- Optionally add an extra amount paid each period from now.
- Click Calculate to update summary KPIs and schedule.
- Use Download CSV or Download PDF to export results.
- Try example presets to learn typical scenarios quickly.
FAQs
Dates start from your selected next payment date. They advance by one calendar month in monthly mode, or by N days in the "Every N days" mode.
No. We assume you pay the same installment as your original monthly amount, plus any extra, but on the chosen interval. This repays faster than monthly payments.
Each period’s rate is computed using daily compounding:
(1 + APR/365)N − 1. If APR is zero, interest is zero each period.
Because the schedule is not monthly, we approximate months using 30.4375 days per month to compare against the baseline monthly plan.
Payments are entirely principal. Dates still follow your interval, and payoff time shortens as you increase payment frequency or extra amounts.
No. This tool focuses on the loan amortization portion only. Add any fees or insurance separately to your budget calculations.
Input & Derived Data Snapshot
| Loan amount (P) | $25,000.00 |
|---|---|
| APR (annual) | 6.5000% |
| Monthly rate (r) | 0.54167% |
| Original term (n) | 60 months |
| Payments made so far (k) | 12 months |
| Original monthly payment (A) | $489.15 |
| Current balance Bk | $20,626.38 |
| Next payment date | 2026-01-25 |
| Selected interval | Monthly |
Extra Payment Sensitivity
Baseline: Monthly, extra = $0
Compare how different extra amounts change the remaining periods, payoff date, and interest left from today.
| Extra per period | Months left | Projected payoff date | Interest remaining | Interest saved vs baseline |
|---|---|---|---|---|
| $0 | 48 | 2029-12-25 | $2,852.99 | $0.00 |
| $25 | 46 | 2029-10-25 | $2,693.13 | $159.86 |
| $50 | 43 | 2029-07-25 | $2,550.06 | $302.94 |
| $100 | 39 | 2029-03-25 | $2,306.55 | $546.45 |
| $150 | 36 | 2028-12-25 | $2,106.69 | $746.30 |
| $200 | 33 | 2028-09-25 | $1,939.21 | $913.78 |
| $300 | 29 | 2028-05-25 | $1,675.03 | $1,177.96 |