Quick guide
How to use this calculator
- Enter a single internally consistent property scenario.
- Use the field labels to preserve each page's specific investment, transaction, lease, development, or lodging convention.
- Review the calculator-specific boundary before interpreting the result.
Calculation method
Calculation method
Loan constant = annual debt service ÷ original loan principal × 100%.
Entered fixed decimals use exact rational arithmetic except the explicitly approximate IRR root. Money rounds only for display and supported nonzero amounts remain visible.
Worked example
Worked example
80,000 annual debt service on 1,000,000 principal gives an 8% loan constant.
Loan constant = annual debt service ÷ original loan principal × 100%.
Supported inputs
Precision and limits
Visible input limits
Amounts accept up to 30 digits and 12 decimal places and are capped at 1e12 per input. Whole-number periods are capped at the page's stated range; rates are capped at 1000%.
International scope
No currency, tax regime, lease law, lender threshold, local market feed, appraisal, or jurisdiction-specific charge is assumed.
Decision boundary
Results are visitor-entered arithmetic scenarios, not appraisals, forecasts, loan approvals, legal or tax determinations, or investment recommendations.
Calculator-specific assumptions
This uses entered annual debt service and does not solve an interest rate or amortization schedule.