Inputs
Example scenarios (click Load)
| Label | Amount | APR | Years | PPY | Extra | Load |
|---|
Summary
Phase 2 base payment: $0.00
Due per period incl. T&I: $0.00
Total interest: $0.00
Total paid: $0.00
Balloon due at end: $0.00
Payoff/End date: —
Periods: —
Payment Breakdown & Balance (Plotly)
Stacked bars show principal/interest; line is remaining balance.Yearly Rollup (by loan year)
| Loan Year | Total Paid | Interest | Principal | Extras | T&I | Ending Balance |
|---|
Sensitivity: Extra Payment Impact
Compares payoff and interest versus current settings.| Extra / Period | Base Payment | Due / Period | Total Interest | Interest Saved | Total Paid | Periods | End/Payoff Date |
|---|
APR → Periodic Rate Lookup
| Payments/Year | Model | Compounds/Year | Periodic Rate (%) |
|---|
Amortization Schedule
| # | Date | Payment | Interest | Principal | Extra | T&I | Balance |
|---|
Formula used
The base periodic payment for a level-payment amortizing loan is:
Payment = P * r / (1 - (1 + r)-n)
where:
P = principal (loan amount)
r = periodic rate (see rate model below)
n = number of amortizing payments
Nominal compounding: r = (1 + APR/c)^({c/ppy}) - 1
Simple model: r = APR / ppy
With a balloon B after m payments:
Payment = ((P*(1+r)^m - B) * r) / ((1+r)^m - 1)
If r = 0: evenly allocate principal (or principal minus balloon) across payments.
Interest-only periods pay interest first; scheduled amortizing payments start afterward. Extras always reduce principal directly and can shorten the schedule.
How to use this calculator
- Enter the loan amount, APR, term, and payment frequency.
- Open Advanced options to tune compounding, balloon, or interest-only.
- Press Calculate to build the schedule, summary, and chart.
- Hover the chart to inspect principal/interest and remaining balance.
- Use Download CSV or Download PDF to export results.
- Try preset scenarios to see different outcomes instantly.
FAQs
APR is annual; the periodic rate depends on payments per year and (optionally) the compounding frequency you choose.
During interest-only months you pay interest (plus escrow/extras). Principal amortization begins afterward.
It’s a lump sum due at the end. We show it separately and compute amortizing payments to reach that remaining balance.
The bars show principal and interest. The summary chips include taxes/insurance in the “due per period” value.
We split principal evenly (or to the balloon) across amortizing periods. Interest-only periods then charge zero interest.
If you set an annual increase, the recurring extra grows once per year using compound growth.
Yes. Choose “Nominal with compounding” and set compounds per year to match your lender’s terms.