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ARM Mortgage Calculator (Adjustable Rate)
Compare the introductory fixed-rate payment of an Adjustable-Rate Mortgage against the worst-case adjusted payment after rate caps. Supports 5/6, 7/6, 10/6 ARMs.
FINANCECompare your introductory ARM payment against the worst-case adjusted payment after caps. Useful for evaluating whether the initial rate discount is worth taking on rate risk.
ARM caps are written as periodic/first/lifetime (e.g., 2/1/5): how much the rate can move at each adjustment, at the first adjustment, and over the loan's life. Index is typically SOFR or 1-year CMT; lender adds a margin (2.5-3% common). Federal law requires lenders to qualify ARM borrowers at the fully-indexed rate, not the teaser.
Disclaimer: Worst case only. Actual future adjustments depend on the underlying index. Read your loan estimate for exact cap structure.
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Frequently Asked Questions
What is the ARM Mortgage Calculator (Adjustable Rate) for?
Compare your introductory ARM payment against the worst-case adjusted payment after caps. Useful for evaluating whether the initial rate discount is worth taking on rate risk.
How do I use the ARM Mortgage Calculator (Adjustable Rate)?
ARM caps are written as periodic/first/lifetime (e.g., 2/1/5): how much the rate can move at each adjustment, at the first adjustment, and over the loan's life. Index is typically SOFR or 1-year CMT; lender adds a margin (2.5-3% common). Federal law requires lenders to qualify ARM borrowers at the fully-indexed rate, not the teaser.
How accurate are my arm mortgage (adjustable rate) results?
Worst case only. Actual future adjustments depend on the underlying index. Read your loan estimate for exact cap structure.
Is the ARM Mortgage Calculator (Adjustable Rate) free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.
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