Current ARM mortgage rates report for Aug. 18, 2025Glen is an editor on the Fortune personal finance team covering housing, mortgages, and credit. He_s been immersed in the world of personal finance since 2019, holding editor and writer roles at USA TODAY Blueprint, Forbes Advisor, and LendingTree before he joined Fortune. Glen loves getting a chance to dig into complicated topics and break them down into manageable pieces of information that folks can easily digest and use in their daily lives.The current average rate on 5-year adjustable-rate mortgages is 7.26%, according to data from the popular real estate marketplace Zillow. If you_re considering an ARM to buy a home, whether to call your own or as an investment property, read on-we_ll take a look at average rates for a couple ARM types, show you how ARMs work, and explain when such a loan might be worth considering even though fixed-rate mortgages are by far the more popular option.You can see the previous business day_s ARM rates report here.Average ARM mortgage ratesNote that Fortune reviewed the most recent Zillow data available as of Aug. 15.Fixed-rate vs. adjustable-rate mortgagesAbout 92% of households with mortgages have fixed-rate home loans. Unlike ARMs, where the interest rate can fluctuate after an initial fixed-rate period, your rate is the same for the life of the loan when you have a fixed-rate mortgage. It_s easy to see why that_s a popular option.However, ARMs can make sense in certain situations. In other words, you might find you_re among the roughly 8% of mortgage holders who decide this type of loan offers an opportunity.When you might consider an adjustable-rate mortgageHere are three categories of homebuyer for whom ARMs can be helpful:Buyers of temporary or "starter homes." If you_re fairly confident you won_t be in your home for long, an ARM might be a strategic choice since you can take advantage of the low fixed-period interest rate and then sell the home before the adjustment period hits.Investors. Many real estate investors like ARMs for a similar reason. They may secure a low interest rate upfront, and as the adjustment period approaches in three, five, or seven years, can adjust the rent to reflect the new mortgage payment or flip the property and buy the next one.Buyers during periods of high interest rates. Finally, many buyers go out on a limb with an adjustable-rate mortgage during periods of high interest since it_s more likely to offer a lower rate upfront and on the back end, assuming things cool off by the time your fixed period expires.Pro tipSaving up for a down payment? Make sure you have a high-yield savings account.How adjustable-rate mortgages workARMs typically start off with a low, fixed interest rate for a set period of time-such as three, five, seven or 10 years-and after the "fixed period" expires, the "adjustment period" begins.Here_s where things get interesting. During the adjustment period, the interest rate on your ARM can fluctuate based on several key factors, including:Benchmark rates. ARMs commonly get their base interest rate from a benchmark called the Secured Overnight Financing Rate (SOFR). The U.S. Treasury publishes a new SOFR each morning as a way to tell banks and lenders "hey, here_s the cost of borrowing cash today." That, in turn, helps lenders set market-appropriate interest rates for various products from auto loans to mortgages.Margins. The margin is a fixed percentage that your lender adds to the index to come up with your ARM interest rate. So if you have an ARM tied to the SOFR and the SOFR is 5% while your margin is 2%, your ARM rate will be 7%. Margins typically range between 2% and 3.5% and can vary based on the lender, loan and your creditworthiness. Margins are also set in stone as part of the loan agreement, so it_s best to shop around to see which lenders can offer more competitive margins.Rate caps. Finally, rate caps put a limit on how much your rate can rise throughout the course of the loan. "Initial" adjustment caps control how much the rate can rise the first time, "subsequent" adjustment caps dictate how it can rise after the initial cap, and "lifetime" adjustment caps put a limit on how much your interest rate can increase in total.The most common ARM length may be the 5/1, meaning the loan has a fixed interest rate for five years, and once that expires, the interest rate will start changing every one year for 25 years (most ARMs have 30-year terms).Another common ARM length is the 10/6, meaning you_ll have a 10-year fixed period and a 20-year adjustment period during which the interest rate will change every six months. You may also see 3/1 ARMs, 7/1 ARMs and 10/1 ARMs.Learn more: Why the Secured Overnight Financing Rate might matter for your mortgage.Check Out Our Daily Rates Reports- Discover the highest high-yield savings rates, up to 5% for August 18, 2025.- Discover the highest CD rates, up to 4.50% for August 18, 2025.- Discover the current mortgage rates for August 18, 2025.- Discover current refi mortgage rates report for August 18, 2025.- Discover the current price of gold for August 18, 2025.Refinancing from an ARM to a fixed-rate mortgageSometimes, even if it was advantageous to buy your property using an ARM, you eventually realize a fixed-rate mortgage would be preferable looking ahead. For instance, maybe you_ve decided your first home is going to be a long-term home after all. You_re not alone if that_s the situation-research from 2024 found that a substantial number of Millennial and Gen Z homeowners can_t afford to upgrade and are making do with their starter homes.Regardless of the specific reason, know that it is possible to refi from an ARM to a fixed-rate mortgage. In fact, it_s probably a fairly common reason for ARM holders to refinance.Refinancing from an ARM to a fixed-rate mortgage isn_t rocket science, and works pretty much like refinancing from fixed-to-fixed. You_ll apply with multiple lenders to find the best rates, provide the necessary documentation, close on your new loan and pay your old loan in full.Pros and cons of adjustable-rate mortgagesLike any other mortgage type, ARMs come with a mix of pros and cons. While your lender can ultimately decide which mortgage type is right for you, knowing the basics can help you budget and navigate the early steps of the process:Possibility for a lower interest rate upfront. Lenders typically offer lower interest rates for ARMs than fixed-rate mortgages during the initial (aka fixed) period.Lower borrower requirements. Because monthly payments start out lower, many lenders may ease requirements for ARM borrowers compared to fixed-rate borrowers (e.g. potentially accepting borrowers with 50% DTI).Monthly payments may decrease. If interest rates drop between now and when your fixed period ends, you may find yourself paying an even lower monthly payment.ConsBut, monthly payments may go up. Once your fixed rate expires, your interest rate can rise as high as the lifetime cap allows (often up to 5 percentage points higher than your starting rate). To illustrate, if the interest rate on a $400,000 principal rose from 7% to 12% overnight, the monthly payment would rise from something like $2,661 to around $4,114-a leap of $1,453, or 54.6% to put it another way.Difficult to rate shop. When discount points are removed from the equation, fixed-rate mortgage offers from Lenders No. 1 and No. 2 will be relatively easy to compare apples to apples. ARMs, however, have numerous moving parts and it can be difficult to find the right deal upfront.Less peace of mind. Even as the cost of taxes and insurance rises, fixed-rate borrowers have the peace of mind knowing that their fundamental mortgage payment will never change. ARM borrowers may enjoy lower rates upfront and possibly lower rates long term, but they won_t enjoy that long-term sense of stability.