Fixed-rate amortization
Monthly principal-and-interest is held constant unless the balance is paid off early.
Finance tool
Model fixed-rate loans, extra payments, and side-by-side payoff scenarios
Spawn loan scenarios and comparison windows, separate principal-and-interest from escrow, and inspect every month on the timeline.
Workspace
Build fixed-rate loan scenarios, add one-time or recurring extra principal payments, and compare any visible series across multiple windows.
Loan scenarios
Comparisons
Notes
Use this space for project notes before saving as PDF.
Disclaimer: Use calculations at your own risk. For critical applications, verify results against your governing standards/specifications.
What this page models
Escrow shown separately
Monthly escrow is additive so you can isolate the base payment from total monthly out-of-pocket.
Extra payments shorten term
Extra payments apply to principal only and move the payoff date forward.
Hover every month
Charts expose date-specific values by scenario so you can inspect balance, interest, principal, escrow, and payoff timing.
How it works
- Enter the original loan amount, APR, term, start month, and monthly escrow.
- Add optional extra principal events as one-time payments or monthly recurring payments.
- The tool recalculates the loan month by month until the balance reaches zero.
- Each scenario exposes its amortization table and chart series to any comparison window you open.
FAQ
Does this support adjustable-rate mortgages?
No. This page is intentionally limited to fixed-rate loans so the payment math stays transparent.
Does escrow affect payoff?
No. Escrow is displayed alongside the payment but does not reduce principal.
What happens when extra payments overlap?
All extra principal events active in the same month are summed and applied together.