Fidamen

Business Loan Payment Calculator with Bi-Weekly Payments

This calculator estimates periodic payments, total interest, and estimated payoff time for business loans when using bi‑weekly payment schedules. It supports true bi‑weekly (26 payments per year), a split‑monthly approach (24 payments per year), and a monthly schedule for side‑by‑side comparison.

Results are estimates intended for planning and comparison. Exact payoff timing and accrued interest depend on your loan contract, lender application of payments, rounding rules, and whether interest is computed on a different compounding basis.

Updated Nov 18, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record eceafbe514b5 • Reviewed by Fidamen Standards Committee

Calculates payments assuming 26 equal payments per year (every two weeks). Allows additional payment per period and computes adjusted payoff time and total interest using closed‑form formulas.

Inputs

Results

Updates as you type

Scheduled periodic payment (base)

—

Actual payment per period (with extras)

—

Estimated number of periods to payoff

—

Estimated payoff time (years)

—

Estimated total interest

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Estimated total amount paid

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OutputValueUnit
Scheduled periodic payment (base)—USD
Actual payment per period (with extras)—USD
Estimated number of periods to payoff——
Estimated payoff time (years)—years
Estimated total interest—USD
Estimated total amount paid—USD
Primary result—

Visualization

Methodology

Calculations use closed‑form amortization formulas. The periodic interest rate equals APR divided by the number of scheduled payments per year for the chosen method. The scheduled periodic payment is the standard annuity formula. When an extra payment per period is provided, the calculator computes an adjusted payoff period using the inverse of the annuity formula (logarithmic solution).

This tool assumes fixed-rate loans with level payments. It does not perform a full period-by-period amortization table with lender-specific rounding, nor does it model interest capitalization rules that vary by servicer. For precise payoff dates, request an official payoff statement from your lender.

Worked examples

Example 1: $100,000 principal, 6.5% APR, 5 years, true bi‑weekly (26/year) — calculator shows the base bi‑weekly payment, estimated payoff in years with no extra, and interest saved compared to monthly.

Example 2: Add $50 extra per bi‑weekly period; the calculator updates estimated payoff time and total interest using the closed‑form solution instead of simulating every period.

F.A.Q.

What is the difference between true bi‑weekly and split monthly?

True bi‑weekly means 26 payments per year (every two weeks). Split monthly means taking the monthly payment and splitting it into two equal amounts, resulting in 24 payments per year. True bi‑weekly generally accelerates payoff more than split monthly.

Are these results exact?

No. These are mathematically consistent estimates. Exact figures depend on your lender's payment application rules, rounding, day count conventions, fees, and any prepayment penalties. Always confirm with your loan servicer for a formal payoff quote.

How does an extra payment affect payoff time?

An extra fixed amount added to each periodic payment increases the payment that gets applied to principal, which reduces the number of periods to payoff. This calculator uses a closed‑form formula to estimate the new number of periods; for irregular extras or per‑transaction timing effects, request an amortization schedule.

What should I check before switching payment schedules?

Verify with your lender that they accept the chosen schedule, confirm how they apply payments (to interest vs principal first), and check for prepayment penalties or minimum payment rules.

Why do results sometimes differ from my lender's statement?

Differences arise due to rounding policies, interest calculation day counts, additional fees, or timing of first/last payments. This calculator follows standard financial formulas and IEEE floating point arithmetic; lender systems may use different conventions.

Sources & citations

Further resources

External guidance

Versioning & Change Control

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

Record ID: eceafbe514b5

What changed (latest)

v1.0.0 • 2025-11-18 • 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 18, 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 • 2025-11-18 • 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: 4acef6bc96ca