Calculator Inputs and Outputs
Inputs
- Loan principal — example: 500000
- Annual interest rate (%) — example: 6.5
- Interest-only period (years) — example: 10
Results
- Monthly interest-only payment
- Interest paid during period
- Principal remaining
Formula used
Monthly interest-only payment = principal × annual rate ÷ 12; principal remains due at the end.
How to Use the Interest-Only Mortgage Payment Calculator
Enter the requested values, check the units and assumptions, then select Calculate Interest-Only Mortgage Payment. The built-in defaults provide a complete working example.
Formula
Monthly interest-only payment = principal × annual rate ÷ 12; principal remains due at the end.
Understanding the Results
The primary answer appears first. Supporting outputs show related quantities, conversions, dates, costs, ratios, or intermediate values. Calculations keep additional precision before display rounding.
Accuracy Tips
- Use measured values and consistent units.
- Review assumptions, rates, timing, and efficiency inputs.
- Recalculate after changing any condition.
Important Note
This tool provides an informational estimate. Confirm critical financial, medical, construction, scientific, tax, legal, or safety decisions with an appropriately qualified professional.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology