Fidamen

Home Loan Balloon Payment Calculator with Bi-Weekly Payments

This calculator helps homeowners and loan officers estimate periodic payments and the balloon (remaining) balance on loans that have a balloon due before full amortization. It supports bi-weekly and monthly payment frequencies and allows either calculating the payment from a chosen amortization schedule or using a known periodic payment.

Use the amortization-based method when payments are set to amortize the loan over a longer schedule (for example, a 30-year amortization with a 5-year balloon). Use the payment-override method when you already make or are quoted a specific periodic payment and want to know the remaining balance at the balloon date.

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

Governance

Record 7616129a0a03 • Reviewed by Fidamen Standards Committee

Assumes a fixed-rate loan with payments at the selected frequency. Payment is calculated to fully amortize over the amortization term; the balloon is the outstanding balance after the balloon period.

Inputs

Results

Updates as you type

Periodic payment

$701.23

Balloon (outstanding balance at balloon date)

$273,492.57

Total paid before balloon

$91,159.91

Interest paid before balloon

$64,652.48

OutputValueUnit
Periodic payment$701.23USD
Balloon (outstanding balance at balloon date)$273,492.57USD
Total paid before balloon$91,159.91USD
Interest paid before balloon$64,652.48USD
Primary result$701.23

Visualization

Methodology

All computations use the standard fixed-rate loan formulas for level (constant) periodic payments and outstanding balance after n payments. Periodic rate = APR / payments per year. Payment for amortization is r * P / (1 - (1 + r)^(-M)). The remaining balance after N payments is computed by compounding the principal and subtracting the scheduled principal paid.

When comparing monthly vs bi-weekly outcomes, the calculator recomputes periodic rates and counts of payments for each frequency (12 vs 26) and reports differences in balloon and cumulative interest paid up to the balloon date. Results assume consistent payment timing and do not model rounding conventions of specific servicers.

Worked examples

Example 1: $300,000 loan, 4.5% APR, 30-year amortization, 5-year balloon, bi-weekly payments. The tool computes the bi-weekly payment that would amortize over 30 years and the remaining balance after 5 years (the balloon).

Example 2: Same loan but you already pay a specific bi-weekly amount. Enter that amount in 'Periodic payment' to calculate the outstanding balloon after 5 years without recalculating payment from amortization.

F.A.Q.

Does the calculator include escrow, fees, or prepayment penalties?

No. This tool computes principal and interest outcomes only. Escrow, lender fees, or contractual prepayment penalties are not included. Check loan documents or consult the servicer for fee and penalty details.

How accurate are the results compared with my loan statement?

Results use textbook amortization formulas and assume exact timing and consistent periodicity. Actual servicer statements may differ slightly due to rounding rules, payment posting dates, day-count conventions, or interim interest charges. Use results for planning and verification, and confirm final amounts with your lender or closing agent.

Why compare monthly and bi-weekly?

Payment frequency changes the periodic rate and number of compounding periods. Bi-weekly schedules can reduce interest paid before a balloon if payments effectively increase annualized payment volume. Use the comparison to quantify the difference.

What if my loan uses interest-only payments until the balloon?

This calculator does not model interest-only schedules. For interest-only loans, payments do not reduce principal; the balloon equals the original principal unless principal payments occur. Use the known-payment method and set payment_override to the actual interest-only payment to see the outstanding balance (which will remain equal to principal if only interest is paid).

How should I handle leap years and exact payment dates?

This tool assumes uniform periods per year (12 or 26). It does not prorate by exact calendar days or adjust for leap years; for high-precision settlement calculations, consult your servicer or a settlement agent.

Sources & citations

Further resources

External guidance

Versioning & Change Control

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

Record ID: 7616129a0a03

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: 5b17cecee1a5