How to use this calculator
- Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
- Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
- Copy, share, save, or download your result. Saved inputs stay on this device.
How the calculation works
The amortizing payment formula assumes monthly installments and a fixed nominal annual rate divided by 12. A longer term lowers the regular payment but usually raises total interest. Compare scenarios using the same principal to isolate the effect of term or rate.
A worked example
A $20,000 loan at 7% for 5 years requires about $396.02 per month before any fees.
Reading your result
Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.
Frequently asked questions
What happens at 0% interest?
The calculator divides the principal evenly by the number of monthly payments.
Are fees included?
No. Origination charges, late fees, and prepayment penalties are excluded.
Sources & methodology
Formula review: October 24, 2026. Read our methodology.