Inputs
$
$
$
$
Adds negative equity if greater than trade-in.
$
%
Biweekly uses 14-day periods with 26 per year.
Used for the schedule dates.
%
$
$
$
$
$
Optional; reduces periodic payment if > 0.
$
Applies on that schedule row if entered.
Your inputs are saved locally for convenience.
Summary
Payment per period
$0
Payoff date
—
APR / period rate
0% (0)
Total interest
$0
Total paid
$0
Amount financed
$0
Sales tax
$0
Fees financed
$0
Fees upfront
$0
Due at signing
$0
Amortization Schedule
0 rows| # | Date | Payment | Principal | Interest | Extra | Balance |
|---|
Charts
Interactive Plotly chart. Hover to see values; pinch to zoom.
Scenario Compare
| Use | Name | Saved | Actions |
|---|
Select scenarios to overlay on the chart. Saving stores full inputs locally.
Example Data
| Scenario | Price | Down | APR | Term | Freq | Tax % | Fees | Extra/period |
|---|---|---|---|---|---|---|---|---|
| Budget commuter | $24,000 | $2,000 | 4.9% | 48 | Monthly | 7.5% | $650 | $0 |
| Standard midsize | $35,000 | $5,000 | 5.49% | 60 | Monthly | 7.5% | $849 | $50 |
| Aggressive payoff | $42,000 | $8,000 | 6.2% | 72 | Biweekly | 8.25% | $920 | $100 |
Use “Load example” to prefill the Standard midsize scenario.
Formulas used
- Period rate: r = APR / m, where m is 12 for monthly or 26 for biweekly.
- Payment with balloon B: M = (P*r) / (1 - (1+r)^(-n)) - (B * r) / (1 - (1+r)^(-n)), with n periods.
- Interest per period: It = r × Balancet-1.
- Principal component: Prt = M - It (plus any extra or lump-sum on that row).
- Sales tax: basis toggle: gross vs net price after credits.
- Amount financed: P = Price - Down - TradeIn + Payoff - Rebate + (FinanceFees ? Taxes+Fees : 0).
- Totals: Total interest = Σ It; Total paid = Σ payments + upfront fees not financed.
How to use this calculator
- Enter vehicle price, down payment, trade-in value, any payoff, and rebate.
- Set APR, term, frequency, and start date. Add extra payments.
- Pick your sales tax basis and add typical title or dealer fees.
- Choose whether to finance taxes and fees or pay them upfront.
- Optionally add a one-time lump-sum prepayment and any balloon.
- Click Calculate. Review KPIs, charts, and the amortization table.
- Export as CSV or PDF. Use Copy permalink to share.
Frequently Asked Questions
APR includes the nominal rate plus certain costs to borrow. Here we treat APR as the effective annual rate translated to the chosen payment frequency.
It depends on location. Use the Tax basis selector to switch between taxing the full price or the net price after credits.
Financing reduces cash due at signing but increases interest over time. Paying upfront lowers interest and total cost if affordable.
They go straight to principal, which shortens the schedule and reduces total interest. You can model both recurring and one-time prepayments here.
A final balloon lowers periodic payments but leaves a large amount due at the end. Set a value if your loan has one.
Because interest accrues on a declining balance and due to rounding, the final payment is adjusted so the balance reaches exactly zero.
Yes. Click Copy permalink to copy a URL with your inputs. The calculator also saves your last inputs locally on this device.
Credit Tier Benchmarks (illustrative)
| Tier | Score range | Typical APR (new) | Typical APR (used) | Common terms (months) |
|---|---|---|---|---|
| Excellent | 760–850 | 3.5–5.0% | 4.5–6.5% | 36–72 |
| Good | 700–759 | 5.0–7.0% | 6.5–9.0% | 48–72 |
| Fair | 640–699 | 7.5–12.0% | 9.5–15.0% | 60–84 |
| Subprime | 300–639 | 12–20%+ | 14–22%+ | 72–84 |
Figures are broad, educational estimates only and vary by lender and region.
Payment Sensitivity — $35,000 price, $5,000 down, 60 months
Amount financed $30,000; payments computed with standard amortization, no fees.
| APR | Payment/month | Total interest |
|---|---|---|
| 3.0% | $539.06 | $2,343.64 |
| 4.0% | $552.50 | $3,149.74 |
| 5.0% | $566.14 | $3,968.22 |
| 6.0% | $579.98 | $4,799.04 |
| 7.0% | $594.04 | $5,642.16 |
| 8.0% | $608.29 | $6,497.51 |
Term Sensitivity — $30,000 financed at 6.00% APR
Standard amortization, monthly payments, no fees, no extras.
| Term (months) | Payment/month | Total interest |
|---|---|---|
| 36 | $912.66 | $2,855.69 |
| 48 | $704.55 | $3,818.44 |
| 60 | $579.98 | $4,799.04 |
| 72 | $497.19 | $5,797.44 |
| 84 | $438.26 | $6,813.56 |
Monthly vs Biweekly — $30,000 financed, 6.00% APR, 60-month horizon
| Frequency | Payment per period | Periods | Total interest | Approx payoff time |
|---|---|---|---|---|
| Monthly | $579.98 | 60 | $4,799.04 | 60 months |
| Biweekly | $267.38 | 130 | $4,759.01 | ~60 months |
Biweekly applies payments more frequently, typically trimming interest slightly versus monthly, all else equal.