Fidamen

Business Loan Amortization Calculator

This calculator computes business loan amortization for multiple payment frequencies and modes, including monthly, bi‑weekly (standard 26 payments/year) and an accelerated bi‑weekly method that pays half of the equivalent monthly payment every two weeks. Use recurring extra payments to model accelerated principal reduction.

Results include per‑period payment, total paid, total interest, and an estimate of repayment time. Outputs are numerical estimates for planning and negotiation; always confirm final terms with your lender.

Updated Nov 2, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 3d196424dc46 • Reviewed by Fidamen Standards Committee

Uses half of the standard monthly payment paid every two weeks (commonly used accelerated method). This typically reduces term and total interest compared to a straight 26‑period conversion.

Inputs

Advanced inputs

Bi‑weekly options

Results

Updates as you type

Bi‑weekly payment (accelerated)

$966.64

Number of bi‑weekly payments (exact)

118.3374

Equivalent months to repay

54.6172

Total paid

$114,389.63

Total interest

$14,389.63

OutputValueUnit
Bi‑weekly payment (accelerated)$966.64USD
Number of bi‑weekly payments (exact)118.3374—
Equivalent months to repay54.6172months
Total paid$114,389.63USD
Total interest$14,389.63USD
Primary result$966.64

Visualization

Methodology

The calculator models amortizing loans using standard time‑value‑of‑money formulas. Periodic interest rates are derived by dividing the annual rate (APR) by the number of payment periods per year (12 for monthly, 26 for bi‑weekly, 52 for weekly).

The accelerated bi‑weekly method commonly used in practice takes half the monthly payment and applies it every two weeks. This produces extra principal payments over a year (26 half‑payments equals 13 full monthly payments), shortening the schedule and reducing interest compared to a straight 12‑period conversion.

F.A.Q.

Is the accelerated bi‑weekly method always better than the standard bi‑weekly conversion?

Accelerated bi‑weekly often reduces total interest and shortens term because it effectively applies an extra full monthly payment each year. However, actual impact depends on APR, term, and any recurring extra payments. Use both modes in the tool to compare.

Do results match my lender statement exactly?

This tool provides numerical estimates using standard amortization formulas. Lenders may use day‑count conventions, fees, rounding rules, or different APR definitions that affect exact payment schedules. Use outputs for planning and verify final payoff amounts with your lender.

How should I enter extra payments?

Enter extra_payment as the additional amount you plan to pay each scheduled payment (for example, additional principal each bi‑weekly or monthly payment). The calculator assumes the extra is applied to principal at each scheduled payment.

What accuracy and limits should I expect?

Formulas assume constant APR and fixed scheduled payments with compound interest per period. They do not include origination fees, prepayment penalties, or changes in interest rate. For regulatory or audit use, confirm with lender statements and consider a full amortization schedule exported and reconciled.

Sources & citations

Further resources

External guidance

Versioning & Change Control

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

Record ID: 3d196424dc46

What changed (latest)

v1.0.0 • 2025-11-02 • 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 2, 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 • 2025-11-02 • 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: 35fd395ba322