Adjustable Rate Mortgage (ARM) Calculator: Estimate Your Payments

Calculate Your ARM Loan Payments

e.g., '5' for a 5/1 ARM.
Fixed amount added to the index rate.
Max change from initial rate (first adjustment).
Max change per adjustment after the first.
Max total increase over the initial rate.
Hypothetical rate (e.g., SOFR, CMT) to project 1st adjustment.

Utilize our Adjustable Rate Mortgage (ARM) Calculator to estimate your monthly loan payments. Understand how initial rates, adjustment periods, and interest rate caps impact your mortgage. Project potential payment changes and assess affordability for your ARM loan with ease. Our tool helps you compare scenarios before committing to a variable-rate mortgage.

Formula:

The core mortgage payment calculation uses the standard formula for an amortizing loan. For an ARM, the interest rate 'i' changes over time based on the loan's terms:

M = P [ i(1 + i)n ] / [ (1 + i)n – 1 ]

Where:

  • M = Monthly loan payment
  • P = Principal loan amount (initial loan balance)
  • i = Monthly interest rate (annual rate divided by 12). This rate adjusts for an ARM.
  • n = Total number of payments over the loan's term (loan term in years multiplied by 12)
For an ARM, the 'i' value is subject to change based on the adjustment period, index, margin, and various caps.

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