What is the difference between Nominal Rate and APR?

The nominal interest rate is the percentage used to compute periodic interest on the loan balance. The Annual Percentage Rate (APR) reflects the true annual cost of borrowing, incorporating origination fees, closing costs, and compounding.

How do prepaid fees affect loan proceeds?

Prepaid fees deducted from loan proceeds reduce the actual cash received in your bank account while leaving your contractual principal loan balance unchanged.

What happens in a balloon-payment loan?

A balloon loan features lower monthly payments based on a long amortization term, but requires paying off the full remaining balance as a lump sum at the end of the contractual loan term.

How do extra principal payments accelerate payoff?

Extra principal payments directly reduce the outstanding balance, preventing future interest from accruing on that amount and shortening the overall loan term.

Universal Loan Calculator

Model payments, fees, APR, balloon balances, deferred repayment and extra-payment strategies in one calculator.

Live

Parameters

R Reset

Presets

Calculation Mode

Contractual Loan Term (Months)

1600

Payment Frequency

Compounding Frequency

Payment Timing

Loan Principal ($)The original base amount before interest or growth.

$25,000.00

$100.00$10,000,000.00

Annual Interest Rate (%)Annual Percentage Rate (APR). US average 30yr mortgage: ~7%.

6.50%

0.00%99.00%

Advanced Insights (Optional)

Add optional income and existing-debt information to estimate how much of your gross monthly income would go toward debt payments.

Gross Monthly Income ($)

$0.00

$0.00$1,000,000.00

Existing Monthly Debt Payments ($)

$0.00

$0.00$500,000.00

Analytics Dashboard

Periodic Payment

$489.15

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Over 60 payments of $489.15, you repay $25,000 of principal and $4,349.22 of interest.

Contractual Principal$25,000.00

Net Cash Proceeds$24,625.00

Total Interest Paid$4,349.22

Results are estimates for educational purposes and may differ from lender disclosures because of fees, payment timing, rounding, compounding conventions, and applicable regulations. This is not financial advice or a lending decision. APR and disclosure requirements vary by jurisdiction. CalcOS does not claim jurisdiction-specific legal compliance unless explicitly stated.

Affordability not assessed

Add gross monthly income and existing monthly debt under Advanced Insights to estimate your debt-service ratio.

InterpretationAdd gross monthly income and existing monthly debt under Advanced Insights to estimate your debt-service ratio.

How to Use the Universal Loan Calculator

The CalcOS Loan Calculator provides complete clarity on your borrowing costs. Model standard amortizing loans, fee-inclusive APRs, deferred-payment structures, balloon maturities, extra-payment payoff acceleration, and debt affordability ratios with mathematical precision.

Input variables:

Calculation Mode: Bounded parameter in the mathematical model.
Solve For Variable: Bounded parameter in the mathematical model.
Discount / Compound Direction: Bounded parameter in the mathematical model.
Loan Principal ($): Bounded parameter in the mathematical model.
Target Maturity Value ($): Bounded parameter in the mathematical model.
Target Periodic Payment ($): Bounded parameter in the mathematical model.
Target Payoff Term (Months): Bounded parameter in the mathematical model.
Annual Interest Rate (%): Bounded parameter in the mathematical model.
Contractual Loan Term (Months): Bounded parameter in the mathematical model.
Amortization Horizon (Months): Bounded parameter in the mathematical model.
Explicit Balloon Amount ($): Bounded parameter in the mathematical model.
Payment Frequency: Bounded parameter in the mathematical model.
Compounding Frequency: Bounded parameter in the mathematical model.
Payment Timing: Bounded parameter in the mathematical model.
Origination Fee Format: Bounded parameter in the mathematical model.
Origination Fee Rate / Amount: Bounded parameter in the mathematical model.
Origination Fee Treatment: Bounded parameter in the mathematical model.
Other Prepaid / Upfront Fees ($): Bounded parameter in the mathematical model.
Other Financed Fees ($): Bounded parameter in the mathematical model.
Recurring Monthly Admin Fee ($): Bounded parameter in the mathematical model.
Recurring Extra Payment ($): Bounded parameter in the mathematical model.
Extra Payment Start Period: Bounded parameter in the mathematical model.
One-Time Lump Sum Payment ($): Bounded parameter in the mathematical model.
One-Time Payment Period: Bounded parameter in the mathematical model.
Prepayment Penalty Rule: Bounded parameter in the mathematical model.
Prepayment Penalty Amount / Rate: Bounded parameter in the mathematical model.
Gross Monthly Income ($): Bounded parameter in the mathematical model.
Existing Monthly Debt Payments ($): Bounded parameter in the mathematical model.