Estimate your initial fixed monthly payment and adjusted monthly payment for an adjustable-rate mortgage (ARM) after the fixed period ends.
Initial monthly payment—USD
Remaining balance at adjustment—USD
Adjusted monthly payment—USD
Ad Space — 300×250
About the ARM Mortgage Calculator
An adjustable-rate mortgage (ARM) starts with a fixed rate for an initial period, then resets to a new rate for the remainder of the term. This calculator illustrates both the initial payment and a one-time adjustment scenario.
Formula: Initial payment uses the standard amortization formula over the full term at the initial rate; the remaining balance after the fixed period is then re-amortized over the remaining months at the adjusted rate.
Real ARMs often adjust periodically (e.g., annually) after the initial period rather than just once, and are subject to rate caps that limit how much the rate can rise at each adjustment and over the life of the loan — this calculator illustrates a single, simplified adjustment.