Adjustable-Rate Mortgage Calculator

Adjustable-Rate Mortgage Calculator — Calculate ARM Payments & Rates

Calculate your adjustable-rate mortgage payments with our comprehensive calculator. Determine initial payments, rate adjustments, caps, and compare with fixed-rate mortgage options.

Step 1: Loan Details

Loan Amount ($)

Loan Term (years)

30 years

Down Payment (%)

20%

Understanding ARM Loans

Adjustable-rate mortgages typically start with a lower initial interest rate than fixed-rate mortgages. The rate adjusts periodically based on market indices.

Step 2: ARM Parameters

Initial Interest Rate (%)

4.5%

Adjustment Period (years)

Lifetime Rate Cap (%)

Periodic Adjustment Cap (%)

About ARM Caps

Lifetime caps limit how much your rate can increase over the loan term. Periodic adjustment caps limit how much your rate can increase at each adjustment period.

ARM Payment Results

Summary

ARM vs Fixed

Payment Schedule

Initial Monthly Payment

$1,520

Based on 4.5% initial rate for 30 years

Loan Amount

$300,000

Down Payment

$60,000

Initial Rate

4.5%

Adjustment Period

3/1 ARM

ARM vs Fixed-Rate Mortgage Comparison

Mortgage Type	Interest Rate	Monthly Payment	Total Interest

ARM Payment Schedule Projection

ARM Payment Formula

Monthly Payment = P × [r(1+r)^n] / [(1+r)^n – 1]

Where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments (term in years × 12).

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