Quick guide
How to use this calculator
- Enter all amounts in one consistent currency.
- Use the rate and whole-period timing named by each visible label.
- Read the result together with its phase, fee, security, and contract exclusions.
Calculation method
Calculation method
Interest-only payment = principal × nominal annual rate/12. Enter zero later repayment months for a balloon, or a positive term to amortize unchanged principal.
Entered monetary components use exact fixed-decimal arithmetic. Amortizing phases use the reviewed stable loan schedule and round only for presentation.
Worked example
Worked example
On 120,000 at 6%, the interest-only payment is 600. With zero later repayment months, the full 120,000 remains due.
Interest-only payment = principal × nominal annual rate/12. Enter zero later repayment months for a balloon, or a positive term to amortize unchanged principal.
Supported inputs
Precision and limits
Visible input limits
Amounts are capped at 1e12, rates at 1000%, phases at 1,200 months, and fixed decimals at 12 places.
Estimate, not advice
The tools model only entered cash flows and contract components. They do not assess approval, legal enforceability, property value, future variable rates, or refinancing availability.
International scope
No currency, country, lender threshold, secured-credit law, tax treatment, fee rule, or consumer protection is assumed.
Calculator-specific assumptions
No principal is paid during the interest-only period. The same entered rate is used for the later amortizing phase; a real rate reset, refinancing, fees, or qualification is not predicted.