Fidamen

Home Loan Balloon Payment Calculator

This tool helps you model balloon payments and the impact of switching to bi‑weekly payments. Use it to estimate the remaining principal (balloon) at a chosen term, compare total interest for monthly vs bi‑weekly schedules, and model any extra payments per period.

Results assume interest compounds per payment period and do not include escrow, taxes, insurance, fees, or prepayment penalties. Use the fields to set loan amount, APR, amortization length, payment frequency, and balloon term.

Updated Nov 11, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record e8794dbb5fd0 • Reviewed by Fidamen Standards Committee

Compute the remaining principal (balloon due) after a given number of years of regular payments on an amortizing schedule. Payments are computed from the amortization schedule; a shorter balloon term than amortization produces a remaining balance due as the balloon.

Inputs

Results

Updates as you type

Payment applied per period

$1,432.25

Balloon (remaining principal) due at term end

$271,342.54

OutputValueUnit
Payment applied per period$1,432.25—
Balloon (remaining principal) due at term end$271,342.54—
Primary result$1,432.25

Visualization

Methodology

Periodic interest rate is computed as APR divided by payments per year. Scheduled payments for an amortizing loan are computed from the standard annuity formula: payment = r*L / (1 - (1+r)^-N). Remaining principal after n payments is derived from the closed‑form amortization balance formula.

Bi‑weekly schedules are modeled as 26 payments/year. The calculator compares total paid under each schedule for the same amortization length to estimate interest savings. Adding an extra payment per period reduces the outstanding balance and therefore the balloon and total interest accordingly.

Accuracy and data handling follow recognized best practices. Calculations use deterministic formulas; results are subject to rounding and input validity. See the citations for standards on numerical reproducibility and software reliability.

F.A.Q.

What is a balloon payment?

A balloon payment is the remaining principal due at the end of a loan term when the scheduled payments do not fully amortize the loan. It is calculated as the outstanding principal after the specified number of payments.

How do bi‑weekly payments reduce interest?

Bi‑weekly schedules increase the number of compounding periods per year (26 vs 12). If payments are sized so the equivalent annualized payment is the same, more frequent compounding and extra effective payments (26 payments ≈ 13 monthly payments) can shorten amortization and reduce total interest.

Are these results guaranteed to match my lender's statement?

No. This calculator provides estimates based on standard amortization formulas and the inputs you provide. Lenders may use different day‑count conventions, rounding, or fees. Always confirm final figures with your lender or loan servicer.

How precise are the calculations and what are the limits?

Calculations use closed‑form formulas and typical floating‑point arithmetic. They assume constant APR, no fees, and on‑time payments. Very large inputs, nonstandard compounding, or bespoke loan features (negative amortization, interest‑only periods, prepayment penalties) are outside the scope.

Sources & citations

Further resources

External guidance

Versioning & Change Control

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

Record ID: e8794dbb5fd0

What changed (latest)

v1.0.0 • 2025-11-11 • 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 11, 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 • 2025-11-11 • 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: 270b7d1fffe4