How to use this calculator
- Enter loan principal, nominal annual rate (%), monthly periods, principal balloon at final payment.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Fixed nominal rate and monthly payments; balloon cannot exceed original principal. Fees, tax and future refinancing are excluded.
Worked example
A 10,000 loan at 0% for 24 months with a 4,000 balloon requires regular payments of 250; the final payment is 4,250.
What the result means
Calculate reduced installments and the larger final payment for a partially amortizing loan.
Common questions
How is the calculation performed?
Monthly payment = (principal − discounted balloon) / present-value annuity factor. Add the balloon to the final regular payment.
What does the model leave out?
Fixed nominal rate and monthly payments; balloon cannot exceed original principal. Fees, tax and future refinancing are excluded.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.