Cernarus

Mortgage Balloon Payment Calculator with Bi-Weekly Payments

This tool estimates the scheduled periodic payment for a loan that amortizes over a specified amortization period and computes the outstanding balance (the balloon payment) at an earlier balloon date. It supports bi-weekly schedules (commonly 26 payments/year) and any other payment frequency you enter.

Use the fields to enter loan principal, APR, full amortization term, months until the balloon payment, and payments per year. Results are estimates; they do not include fees, escrow, taxes, insurance, prepayment penalties, or lender rounding conventions.

Updated Nov 30, 2025

Computes periodic payment based on amortization schedule, then computes outstanding balance at the balloon date (expressed in months). Designed for bi-weekly schedules when payment_frequency is 26.

Inputs

Results

Updates as you type

Scheduled periodic payment

$808.98

Balloon payment (remaining balance)

$265,764.35

Remaining balance at balloon date

$265,764.35

Interest paid through balloon date

$70,931.41

Payments until balloon

130

OutputValueUnit
Scheduled periodic payment$808.98USD
Balloon payment (remaining balance)$265,764.35USD
Remaining balance at balloon date$265,764.35USD
Interest paid through balloon date$70,931.41USD
Payments until balloon130payments
Primary result$808.98

Visualization

Methodology

Periodic payment is computed using standard amortizing loan formulas converting annual APR to the periodic rate by dividing by payments per year and solving the annuity payment formula for the scheduled payment.

Remaining balance at the balloon date is calculated by applying the amortization balance formula after the number of payments that occur before the balloon date. Formulas assume consistent periodic payments and interest charged per period at the periodic rate.

Numeric computations follow IEEE floating-point conventions (see IEEE 754) and results are rounded to cents by default. Development and quality processes reference ISO 9001 principles for quality management and NIST guidance for measurement and testing. OSHA is cited as a reminder that organizational compliance and operational safety practices are outside the scope of this calculator but important for operations teams.

Worked examples

Example 1: $300,000 principal, 5% APR, 25-year amortization, balloon at 60 months, bi-weekly (26/year). The tool returns the periodic bi-weekly payment, remaining balance at 5 years, and total interest paid through that date.

Example 2: For monthly schedule set payments per year to 12 and the balloon months to your contract's balloon timing to compute the monthly scheduled payment and balloon amount.

Further resources

Expert Q&A

How accurate are the results?

Results are mathematically accurate to the formulas used and subject to floating-point rounding. They are estimates and do not include lender-specific rounding rules, fees, taxes, escrow, or prepayment penalties. For legally binding payoff figures contact the lender. The calculator follows IEEE 754 conventions for numeric operations and rounds monetary outputs to the specified number of decimal places (default two).

Can I use this for bi-weekly payments?

Yes. Set payments per year to 26 for bi-weekly schedules. Note that 'bi-weekly' (26 payments/year) differs from 'semi-monthly' (24 payments/year); results will differ.

What if the interest rate is zero?

The standard amortization formula divides by the periodic rate and is not directly defined for zero interest. In a true zero-interest loan, periodic payment equals principal divided by total scheduled payments. If you enter a zero APR, verify the scheduled payment and remaining balance logically; consult lender documentation for special cases.

Does this include taxes, insurance, or escrow?

No. This calculator only computes principal and interest schedules. It does not include taxes, insurance, escrow, HOA, lender fees, or closing costs.

Are there regulatory or standards references?

The numeric implementation references IEEE 754 floating-point arithmetic for predictable numeric behavior. Quality and testing reference ISO 9001 principles and NIST resources for validation and traceability. OSHA is cited for organizational compliance context; it does not apply to financial calculations directly.

Sources & citations