Fidamen

Personal Loan Balloon Payment Calculator

This calculator estimates periodic payments for a loan that uses a standard amortization schedule for recurring payments and leaves a final balloon payment (remaining principal) due at a specified date. It supports bi‑weekly schedules (26 payments/year) and other custom payment frequencies.

Use the amortization period to indicate the schedule used to compute each installment (for example, a 5‑year amortization with a 2‑year balloon means payments are sized as if the loan amortizes over 5 years, but the remaining balance is due after 2 years). Results are numerical estimates for planning and disclosure; verify final numbers with your lender.

Updated Nov 15, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 19e7f3b89248 • Reviewed by Fidamen Standards Committee

Inputs

Results

Updates as you type

Periodic payment (per payment period)

$217.53

Number of payments until balloon

52

Balloon payment due (remaining principal at balloon date)

$15,742.12

Total amount paid until balloon (principal + interest paid by then)

$11,311.59

Total interest paid until balloon

$2,053.71

OutputValueUnit
Periodic payment (per payment period)$217.53USD
Number of payments until balloon52—
Balloon payment due (remaining principal at balloon date)$15,742.12USD
Total amount paid until balloon (principal + interest paid by then)$11,311.59USD
Total interest paid until balloon$2,053.71USD
Primary result$217.53

Visualization

Methodology

The calculator uses standard time‑value‑of‑money formulas: periodic interest rate = annual rate / payments per year. Periodic payment is the level payment that amortizes the principal over the amortization schedule. The balloon amount is the outstanding principal after the specified number of payments.

Quality and numerical behavior follow industry best practices for financial calculators. We document limits and rounding behavior below and reference general standards for accuracy control and risk management in computational tools (NIST, ISO, IEEE, OSHA) to support reproducibility and operational reliability.

F.A.Q.

Does this calculator handle zero interest rates?

The formulas assume a positive periodic interest rate. For a 0% annual interest rate, the periodic payment equals principal divided by the number of amortization payments (principal / n). Enter a very small positive rate or perform manual division for exact zero‑interest cases.

Why is the balloon different from the original principal?

The balloon equals the outstanding principal after the number of payments you specify. If the balloon occurs before full amortization, principal remains and is due at balloon time.

How do I set bi‑weekly payments?

Set Payments per year = 26 for bi‑weekly. If your lender uses a different convention (e.g., semi‑monthly or accelerated bi‑weekly), confirm the lender's schedule and use the matching payments‑per‑year value.

Are results final legal figures I can rely on for closing?

No. Results are estimates for planning and comparison. Final payout and disclosure amounts from your lender or servicer take precedence. Use the outputs to prepare questions and verify lender calculations.

Sources & citations

Further resources

External guidance

Versioning & Change Control

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

Record ID: 19e7f3b89248

What changed (latest)

v1.0.0 • 2025-11-15 • 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 15, 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 • 2025-11-15 • 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: 22ebaaae2dc8