About this calculator
Choosing between a fixed and adjustable-rate mortgage is not a one-size-fits-all decision. It depends on how long you plan to stay, your risk tolerance, and how you think rates will move. This calculator runs both scenarios side by side so the tradeoff is visible, not theoretical.
What it shows you
- Monthly payment: fixed vs. ARM initial rate
- ARM adjustment scenarios (worst case, flat, best case)
- Total interest paid over any time horizon
- Break-even point where fixed-rate total cost is lower
- Full amortization schedule for both loan types
Why it matters
An ARM at today's start rate may look attractive — until you model what a rate adjustment does to the payment. Showing this scenario protects clients and makes the advisor look thorough, not salesy.
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