Fidamen

RV Loan Extra Payments Calculator

This calculator estimates how extra recurring payments, one-time lump sums, and switching to bi-weekly payments affect the life of your RV loan. It shows estimated payoff time and interest savings relative to the scheduled amortization.

Results are computational estimates based on standard amortization math. Use them for planning and discussion with your lender. Actual payoff dates and amounts depend on lender posting practices, compounding conventions, and any fees or prepayment penalties.

Updated Nov 10, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 65121e7cb1cf • Reviewed by Fidamen Standards Committee

Standard amortization with optional recurring extra payments (applied each payment) and optional one-time lump-sum applied at a specified payment number. Uses periodic interest math to estimate payoff periods and interest.

Inputs

Results

Updates as you type

Standard payment (no extras)

$567.74

Payment including recurring extra

$567.74

Years to payoff (recurring extra only)

—

Years to payoff (with one-time lump)

—

Interest savings (recurring extra only)

—

Interest savings (with one-time lump)

—

OutputValueUnit
Standard payment (no extras)$567.74USD
Payment including recurring extra$567.74USD
Years to payoff (recurring extra only)—years
Years to payoff (with one-time lump)—years
Interest savings (recurring extra only)—USD
Interest savings (with one-time lump)—USD
Primary result$567.74

Visualization

Methodology

The calculator models standard fixed-rate amortization using periodic interest math. Periodic rate = APR / payments per year. Standard payment is computed from the annuity formula.

For recurring extras, we compute an effective payment each period and solve for the number of periods required to reduce the principal to zero using the closed-form log formula for annuities. For a one-time lump sum, we compute the balance at the specified payment, subtract the lump sum, and then solve for remaining payments.

Estimates assume interest compounds at the same periodic frequency as payments and that extras are applied immediately to principal. Differences in lender processing (daily interest accrual, payment posting order, or prepayment fees) can produce different results.

Key takeaways

Use the monthly method to evaluate extra recurring monthly contributions and one-time lump sums applied on a monthly payment cadence.

Use the bi-weekly method to see the effect of switching to 26 payments per year and applying extras on a bi-weekly cadence.

All results are estimates. Verify with your lender for precise payoff amounts and dates.

F.A.Q.

Are these results exact?

These are mathematical estimates based on common amortization assumptions. Actual lender interest accrual, payment posting order, or prepayment penalties may change real outcomes. Verify with your lender before relying on results for legal or binding decisions.

What does switching to bi-weekly payments do?

A bi-weekly schedule makes 26 payments per year. If each bi-weekly payment equals half the monthly payment and timing aligns, the extra two half-payments per year can reduce interest and term. This calculator computes an exact periodic-schedule estimate rather than relying on simpler heuristics.

Can I include both recurring extras and a one-time lump sum?

Yes. The tool models recurring extras applied each payment and applies the lump sum at the chosen payment number, then recomputes remaining payoff using the new principal.

What input limits should I use?

Enter your true APR, the loan principal, and the contractual term. Use large lump-sum values only if you will actually apply them; extremely large extras that more than fully repay principal will produce immediate payoff estimates.

Does the calculator consider fees or penalties?

No. This model does not include lender fees, late fees, or prepayment penalties. If your loan includes prepayment penalties, consult your loan documents or lender for precise impact.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: 65121e7cb1cf

What changed (latest)

v1.0.0 • 2025-11-10 • 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 10, 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 • 2025-11-10 • 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: 9d0e503cb13c