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ARM vs Fixed Mortgage Calculator

Compare Adjustable Rate Mortgage (ARM) vs Fixed Rate Mortgage to see which saves you money.

🌐 Uses API
Also try:Mortgage Tools Hub·Mortgage Calculator·Refinance Break-Even Calculator

Frequently asked questions

How do I compare ARM and Fixed mortgages?

Enter your loan details, fixed rate, and ARM terms. We calculate the break-even point where the ARM becomes more expensive than the fixed rate.

When is an ARM better?

An ARM is often better if you plan to sell or refinance before the fixed period ends, as the initial rate is usually lower.

What happens if rates rise?

If rates rise, your ARM payments will increase after the fixed period. We calculate the worst-case scenario based on your caps.

Related tools

Try Mortgage Calculator, Refinance Break-Even, and PMI Drop for more scenarios.

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Frequently asked questions

What is an ARM (Adjustable Rate Mortgage)?
An ARM has an initial fixed-rate period (commonly 5, 7, or 10 years) followed by periodic adjustments based on a market index. A 5/1 ARM is fixed for 5 years, then adjusts annually. ARMs typically start with lower rates than fixed mortgages but carry rate risk.
When should I choose an ARM over fixed rate?
ARMs make sense when: you plan to move or refinance before the fixed period ends, you expect rates to fall, you can handle potential payment increases, or the rate differential is significant (1%+). If you\\
What are ARM rate caps and how do they protect me?
ARMs have caps limiting rate increases: initial cap (first adjustment, often 2%), periodic cap (each subsequent adjustment, often 2%), and lifetime cap (total increase, often 5-6%). A 3% start rate with 5% lifetime cap means rates can never exceed 8%.
How do I calculate worst-case ARM payments?
Our calculator shows payment scenarios including: initial payment, payment at first adjustment (assuming maximum increase), and payment at lifetime cap. Plan to afford the worst case - if you can\\
What index do most ARMs use?
Common ARM indices include SOFR (Secured Overnight Financing Rate), which replaced LIBOR, Treasury rates, and the Prime Rate. Your actual rate is the index plus a margin (typically 2-3%). Lower margins are better; shop around as margins vary by lender.

About This Tool

Compare an ARM vs fixed-rate mortgage with caps, limits, and break-even over your horizon.

Key Benefits

How This Tool Works

  1. 1Enter your information in the input fields above
  2. 2Results calculate automatically in real-time
  3. 3Copy, share, or download your results as needed
  4. 4All processing happens locally in your browser for privacy

When to Use This Tool

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Related topics: ARM, fixed mortgage, adjustable rate, mortgage caps, break-even

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Premium feature

Historical analysis & trends

Track your past calculations and visualize patterns.

Calculation presets

Save, load, and manage your favorite calculation setups.

No presets saved yet.

Scenario planning

Compare multiple inputs side-by-side.

Batch processing

Upload a CSV to compute results in bulk.

Custom formulas

Create and reuse your own rules.

External data

Connect Google Sheets or an API as inputs.

By paying you agree to our Terms & Conditions • Privacy Policy • Shipping Policy • Cancellation & Refunds