Fidamen

Personal Loan Balloon Calculator

This calculator estimates the periodic payment and the final balloon (remaining) balance for a loan that is amortized over a longer period but matures earlier with a balloon payment. It is intended for personal loan scenarios where regular payments are set by an amortization schedule but the outstanding principal is due at a predetermined earlier date.

Enter the loan principal, annual interest rate, amortization term used to size payments, when the balloon is due, and how often payments occur. Results show the payment amount, the remaining principal at balloon maturity, the total cash paid through that date, and total interest paid through that date.

Updated Nov 5, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record ecd911298fe5 • Reviewed by Fidamen Standards Committee

Inputs

Results

Updates as you type

Periodic payment

$199.59

Balloon (remaining) balance at maturity

$28,239.48

Total paid through balloon maturity (payments + balloon)

$40,214.92

Total interest paid through balloon maturity

$10,214.92

OutputValueUnit
Periodic payment$199.59USD
Balloon (remaining) balance at maturity$28,239.48USD
Total paid through balloon maturity (payments + balloon)$40,214.92USD
Total interest paid through balloon maturity$10,214.92USD
Primary result$199.59

Visualization

Methodology

Calculations use standard fixed-rate amortization mathematics. Periodic rate is annual_rate_pct/100 divided by payments_per_year. The periodic payment is computed from the amortization term; the balloon equals the remaining balance after the number of payments until the balloon.

This implementation follows recognized engineering and software-quality practices for numeric calculations. For algorithmic correctness and reproducibility we align with general guidance from standards organizations for numeric software and risk controls (for example guidance published by national standards bodies). Results are rounded at display only; internal calculations maintain higher precision to reduce rounding error.

F.A.Q.

What is a balloon payment?

A balloon payment is the remaining principal balance that becomes due when a loan matures earlier than its amortization schedule, typically a single larger payment at loan maturity.

What should I enter for amortization term vs balloon due date?

Enter the amortization term that determines the payment size (often longer), and a shorter balloon due date when the outstanding principal will be due. For example, a 30-year amortization with a 5-year balloon means payments are sized as if paid over 30 years, but the remaining balance after 5 years is due.

How accurate are results and how is rounding handled?

Displayed values are rounded to two decimal places. Internal computations retain higher precision before rounding. For critical decisions consult your lender and request an amortization schedule. This tool is for estimation and planning only.

Does this calculator include fees, insurance, or taxes?

No. This calculator models only principal and interest. Add additional recurring or one-time costs separately when evaluating affordability or total cost.

What if the interest rate is zero?

The calculator handles a zero interest rate case using simple division of principal over the amortization schedule and linear reduction of principal for the balloon calculation.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: ecd911298fe5

What changed (latest)

v1.0.0 • 2025-11-05 • 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 5, 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 • 2025-11-05 • 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: be6ac826f639