For Students · Loan Amortization
Loan Amortization for a bond ladder
Built for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition. Simulate a bond ladder live below — adjust the inputs and watch it respond, right in your browser.
Loan / Mortgage AmortizationLive
where each payment goes
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A fixed-rate loan has a level monthly payment, but its split shifts over time: early payments are mostly interest, later ones mostly principal. That is why paying extra early, or choosing a shorter term, saves so much interest. Educational tool, not financial advice.
Data Inspector
Monthly payment$2,212
Total interest$446,406
Total paid$796,406
Governing equation
Reading this result: At 6.50% APR over 30 years, the monthly payment is $2,212 and you pay $446,406 in interest — about 128% of the amount borrowed. The payment is level, but its split shifts: your first payment is mostly interest (86% of it), while the last is almost all principal. A higher rate or a longer term sharply raises the total interest, and paying extra early attacks principal before interest can accrue on it.
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Frequently asked questions
- Is this good for students?
- Yes — this version of "Loan Amortization for a bond ladder" is framed for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.