ARM Mortgage Calculator: Estimate Your Adjustable-Rate Mortgage Payments

Calculate Your ARM Mortgage Payments

Loan Amount

Please enter a valid loan amount.

Loan Term (Years)

Please enter a valid loan term.

Initial Interest Rate (%)

Please enter a valid initial interest rate.

Initial Fixed Period (Years)

Please enter a valid initial fixed period.

Adjustment Period (Years) (e.g., '1' for a 5/1 ARM)

Please enter a valid adjustment period.

Margin (%)

Please enter a valid margin rate.

Initial Adjustment Cap (%) (Max % change from initial rate at 1st adjustment)

Please enter a valid initial adjustment cap.

Periodic Adjustment Cap (%) (Max % change from previous rate at subsequent adjustments)

Please enter a valid periodic adjustment cap.

Lifetime Cap (%) (Max % change from initial rate over loan life)

Please enter a valid lifetime cap.

Calculate your Adjustable-Rate Mortgage (ARM) payments with our easy-to-use tool. Understand how initial rates, adjustment caps, and the margin impact your monthly obligations. Plan your home financing confidently by estimating future mortgage costs.

Formula:

The core mortgage payment (P) for a given period is typically calculated using the formula:

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

P = Monthly Payment
L = Loan Amount (Principal)
i = Monthly Interest Rate (Annual Rate / 12)
n = Total Number of Payments (Loan Term in Years × 12)

For an ARM, this formula applies to the initial fixed period and then re-applies for subsequent adjustment periods with a new interest rate, which is derived from a chosen Index plus a fixed Margin, subject to Adjustment Caps (initial, periodic, and lifetime).

Real Estate and Mortgage Tools

ARM Mortgage Calculator: Estimate Your Adjustable-Rate Mortgage Payments

Calculate Your ARM Mortgage Payments

Calculation Results

Formula:

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