Loan Inputs
Export
CSV exports the amortization schedule. PDF includes summary KPIs and the table. Use browser print for full-page PDF with chart if preferred.
Example Scenarios
| Scenario | Principal | Rate % | Years | Extra / mo | Est. Payment |
|---|
Results (calculations appear after you click Calculate)
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Payment / period
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Total interest
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Total paid
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Estimated payoff
| # | Date | Payment | Interest | Principal | Extra | Balance |
|---|
Formula Used
The standard installment amount for a fixed-rate installment loan is computed using the annuity formula:
Payment = P × i / (1 − (1 + i)−n)- P = principal (amount borrowed)
- i = periodic interest rate = APR / periods per year
- n = total number of payments = years × periods per year
Each period, interest = current balance × i. Principal reduction = payment − interest. If you enter an extra monthly contribution, it is added to the principal reduction to shorten the term. Grace months accrue interest-only before regular amortizing payments begin.
How to Use
- Enter the loan details: principal, annual rate, and term. Optionally set a start month, payment frequency, grace months, and extra monthly contribution.
- Click Calculate to generate the amortization schedule, chart, and key totals.
- Use Download CSV for spreadsheets or Download PDF for a formatted report.
- Try the Example Scenarios and tweak inputs to compare strategies.
FAQs
Payments use the standard amortization formula with your selected frequency. Final amounts can vary slightly due to rounding and exact lender conventions.
During the grace period, interest-only payments accrue and are added to the balance if not paid. Regular amortizing payments begin afterward.
Extra payments are added to the principal portion each period, reducing the remaining balance faster and potentially shortening the payoff timeline.
Yes. Choose a payment frequency from the compounding menu. Periods per year adjust to 26 or 52 for approximate biweekly or weekly schedules.
The schedule rounds to cents each period. The final installment is adjusted to clear the remaining balance precisely.
This tool assumes a fixed APR. For step-rate or consolidation planning, run multiple scenarios and compare totals using the example table.