Fidamen

RV Loan Refinance Calculator with Extra Payments

This tool compares your current RV loan to a potential refinance and models the effect of recurring extra monthly payments. It provides estimated new monthly payment, months to payoff when extra payments are applied, total interest, estimated savings, and break-even time on refinance fees.

Results are estimates intended to aid decision-making. They assume fixed interest rates, monthly compounding, no additional fees beyond those entered, and no prepayment penalties unless modeled by you.

Updated Nov 22, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record e0443d7a7cd8 • Reviewed by Fidamen Standards Committee

Estimate new payment if you refinance, the months to payoff when making recurring extra payments, total interest paid on the refinanced amount, and estimated savings and break-even time compared with continuing the current loan.

Inputs

Results

Updates as you type

New monthly payment (including extra)

$316.10

Months to payoff (refinanced with extra payments)

—

Total interest on refinanced loan

—

Estimated savings vs keeping current loan

—

Break-even months for refinance fees

20.3693

OutputValueUnit
New monthly payment (including extra)$316.10USD
Months to payoff (refinanced with extra payments)—months
Total interest on refinanced loan—USD
Estimated savings vs keeping current loan—USD
Break-even months for refinance fees20.3693months
Primary result$316.10

Visualization

Methodology

Monthly payment formulas use standard amortization math: monthly_rate = annual_rate / 12; payment = r*PV / (1 - (1+r)^-n).

When extra monthly payments are specified, the calculator uses the closed-form formula for number of payments required to retire a fixed-rate loan with payment A: n = -ln(1 - r*PV/A) / ln(1+r). Total interest is estimated as total payments minus principal.

Calculations are purely numeric and do not request personally identifiable information. The software development and numerical accuracy practices follow best-practice standards for quality, testing, and security guidance from NIST, ISO, and IEEE; however, outputs are only estimates and not a guarantee of lender terms.

Key takeaways

This calculator gives scenario-based estimates to help decide whether to refinance an RV loan and whether to add recurring extra payments.

It provides quick visibility into new payment amounts, payoff timing with extra payments, total interest, and break-even periods for refinance fees. Verify results with lenders and review all loan documents.

F.A.Q.

Are these results exact?

No. These are mathematical estimates assuming constant monthly rate and fixed payments. Small rounding differences, day-count conventions, escrow, taxes, insurance, and lender-specific fees or prepayment penalties can change actual numbers. Use the results to compare scenarios, not as a legal quote.

What if my loan has a balloon or changing rate?

This calculator assumes a fixed-rate amortizing loan. Balloon payments, adjustable-rate features, interest-only periods, or irregular extra payments are not modeled accurately here.

What standards guide the reliability of this tool?

Development and testing practices referenced include NIST guidance for software and data handling, ISO 9001 for quality management principles, and IEEE recommendations for validation and testing. These references improve trust but do not change that numeric outputs are estimates.

How should I use the results?

Use the outputs to compare scenarios, estimate payoff timing, and evaluate whether a refinance fee is justified. Confirm final terms with a lender and review contract details before refinancing.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: e0443d7a7cd8

What changed (latest)

v1.0.0 • 2025-11-22 • 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 22, 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 • 2025-11-22 • 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: f33f0e5e8b72