What is the difference between an ARM and a fixed-rate mortgage?

A fixed-rate mortgage has the same interest rate for the entire loan term. An adjustable-rate mortgage (ARM) starts with a lower fixed rate for an initial period (e.g., 5, 7, or 10 years), then adjusts periodically based on a market index. ARMs offer lower initial payments but carry rate risk if rates rise after the initial period.

What are ARM rate caps?

ARM caps limit how much your rate can change. A common cap structure is 2/2/5: the first number (2%) limits how much the rate can increase at the first adjustment, the second number (2%) limits each subsequent adjustment, and the third number (5%) is the lifetime cap above the initial rate. So a 5/1 ARM starting at 6% with 2/2/5 caps could go to a maximum of 11%.

When does an ARM make sense over a fixed-rate mortgage?

An ARM can make sense if you plan to sell or refinance before the initial fixed period ends, if you expect rates to fall, or if you need a lower initial payment to qualify for a larger loan. However, if you plan to stay long-term and want payment certainty, a fixed-rate mortgage is usually the safer choice.

What is a 5/1, 7/1, or 10/1 ARM?

The first number indicates the initial fixed-rate period in years (5, 7, or 10). The second number indicates how often the rate adjusts after that (every 1 year is most common). A 5/1 ARM has a fixed rate for 5 years, then adjusts annually. A 7/1 ARM is fixed for 7 years. The 10/1 ARM offers the longest initial stability.

ARM vs Fixed Mortgage Calculator

🏠 Loan Amount (Shared)

Loan Amount $350,000

🔒 Fixed-Rate Mortgage

Fixed Rate 6.81%

Loan Term

Fixed Monthly Payment

$—

same every month for 30 years

📈 Adjustable-Rate Mortgage

Initial ARM Rate 6.24%

Initial Fixed Period

Rate After Adjustment 8.00%

Cap structure: 2/2/5 (typical). Initial cap: 2%, periodic cap: 2%, lifetime cap: 5% above start rate.

ARM Initial Payment

$—

after 7 yrs adjusts to:

$—

⚖️ Side-by-Side Comparison

Period	Fixed-Rate Total	ARM Total	ARM Saves
5-Year Total	$—	$—	$—
10-Year Total	$—	$—	$—
30-Year Lifetime	$—	$—	$—

Adjust inputs above to see your personalized ARM vs Fixed recommendation.

Frequently Asked Questions

A fixed-rate mortgage has the same interest rate for the entire loan term, giving you predictable payments. An ARM starts with a lower rate for an initial fixed period, then adjusts periodically based on a market index (like SOFR). ARMs offer lower initial payments but carry the risk that your payment could increase significantly if rates rise.

ARM caps limit how much your rate can change. The most common cap structure is 2/2/5: 2% cap on the first adjustment, 2% cap on each subsequent adjustment, and 5% lifetime cap above the initial rate. So a 5/1 ARM at 6% with 2/2/5 caps could go up to 8% at first adjustment, 10% at second, but can never exceed 11% total.

An ARM makes the most sense if you plan to sell or refinance before the initial fixed period ends, if you expect interest rates to fall, or if the lower initial payment helps you qualify for the home you want. If you plan to stay long-term and prioritize payment stability, a 30-year fixed is typically the better choice.

The first number is the initial fixed-rate period in years. The second is how often the rate adjusts after that. A 5/1 ARM has a fixed rate for 5 years, then adjusts annually. A 7/1 is fixed for 7 years. A 10/1 offers 10 years of stability before annual adjustments. Longer initial periods typically come with slightly higher starting rates.

Disclaimer: Rates shown are for illustrative purposes only. ARM rates after the initial period depend on market indices and can change significantly. Consult a licensed mortgage professional before choosing a loan type.

ARM vs Fixed Mortgage Calculator

Frequently Asked Questions

📈 Current Rates

🔗 Related Calculators

ARM vs Fixed Mortgage Calculator

Frequently Asked Questions

What is the difference between an ARM and fixed-rate mortgage?

What are ARM rate caps?

When does an ARM make sense?

What does 5/1, 7/1, or 10/1 ARM mean?

📈 Current Rates

🔗 Related Calculators