Fidamen

Motorcycle Loan APR Calculator

This calculator estimates periodic payments, total paid and interest for motorcycle loans and compares monthly and bi‑weekly schedules. It supports APR input, down payment, trade‑in value, fees rolled into the loan, and optional extra payments per scheduled period.

Results use standard amortization math and closed‑form payoff estimates when extra payments are applied. Use the comparison view to see how switching to bi‑weekly payments or adding small extras can reduce interest and shorten payoff time.

Updated Nov 14, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record e2f3fbb87ec8 • Reviewed by Fidamen Standards Committee

Compute the periodic payment, total paid and total interest for the chosen payment frequency using standard amortization formulas and the entered APR.

Inputs

Results

Updates as you type

Payment per period

-$0.19

Number of payments

130

Total paid

-$25.00

Total interest paid

-$10,025.00

OutputValueUnit
Payment per period-$0.19USD
Number of payments130—
Total paid-$25.00USD
Total interest paid-$10,025.00USD
Primary result-$0.19

Visualization

Methodology

Periodic payment formulas assume a nominal APR converted to a periodic rate by dividing by payments per year, then apply the standard annuity formula to compute scheduled payment: payment = r*P / (1 - (1+r)^-N) when the rate is positive. For zero interest the payment is principal divided by number of periods.

When extra payments are added, estimated number of payments to payoff is computed from the closed‑form solution of the amortization recurrence: n = ln(payment divided by (payment minus r times principal)) / ln(1 + r), rounded up to whole periods. This provides an estimate; actual day‑count, lender rounding, or payment posting rules may change precise payoff timing.

F.A.Q.

Does the calculator compute the lender's disclosed APR?

The tool accepts your APR input and applies it as the nominal annual percentage rate divided into periodic rates. It does not compute a lender‑disclosed APR from cash flows or fees; use the loan documents for the official APR disclosure.

Are bi‑weekly payments always better?

Bi‑weekly schedules generally accelerate payoff because 26 payments per year equals 13 monthly equivalents, but the benefit depends on whether the lender applies interest using the same APR and how payments are posted. This calculator shows estimated savings but cannot guarantee lender posting practices.

How accurate are payoff time and interest savings?

Estimates use closed‑form amortization math and standard assumptions about payment posting. Actual results can differ due to lender rounding, varying compounding conventions, day count differences, missed payments, or add‑ons. See accuracy and standards section for details.

Should I use exact dates for payment schedules?

This tool uses period counts and does not model specific calendar dates, billing cycles, or grace periods. For exact payoff dates consult your lender or request an amortization schedule tied to your first payment date.

Sources & citations

Further resources

External guidance

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: e2f3fbb87ec8

What changed (latest)

v1.0.0 • 2025-11-14 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 14, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-14 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: db07427ba501