Arm Mortgage Calculator - Adjustable Rate Mortgage (2024)

This ARM mortgage calculator compares an adjustable rate mortgage to a...show more instructions

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Adjustable-Rate Mortgages Vs. Fixed-Rate Mortgages

Everyone wants a low interest rate.

Some interest rates, though, seem too good to be true.

If you're skeptical about certain advertised interest rates, it's smart to follow through on your gut feeling and dig deeper into the terms of the loan. You might find that those low interest rate loans are adjustable-rate mortgages.

The reality is adjustable-rate mortgages (ARMs) are not inherently bad. They have their pros and cons, so how do you know which type of loan is right for you?

Compare ARMs side-by-side with fixed-rate mortgages and use our ARM Mortgage Calculator. Quickly discover the maximum monthly payment, total interest, and more information for each type of mortgage.

Below is more information about adjustable-rate mortgages so that you can make the best choice for your financial situation . . . .

What Is An Adjustable-Rate Mortgage?

An adjustable rate mortgage is a mortgage where the interest rate rises and falls to reflect market conditions. They are designed to transfer the interest rate risk from the lender to the borrower.

Related: Here’s a scientific system to build your wealth now

If market interest rates (the cost to the lender when borrowing in the credit markets) change, the lender will pass that interest rate change on to all their adjustable rate mortgage holders at predetermined intervals (usually once per year) by a pre-approved percentage.

ARMs have several unique features that are important to understand:

  • An initial interest rate – This is the interest rate at the beginning of the ARM, which is typically lower than market interest rates (known as a teaser rate) and also lower than competing fixed-rate mortgages.
  • A margin –This is a number of percentage points that the lender adds to the index rate which will result in the adjustable-rate mortgage's interest rate.
  • An index rate –Many lenders base ARM interest rates on an index, commonly LIBOR or U.S. Treasury securities.
  • Interest rate caps – Thankfully, there are limits on how high ARM interest rates can rise each year and over the life of the loan.
  • An adjustment period – This is a period of time when the interest rate remains unchanged before the next adjustment is allowed.

Additionally, ARMs can have special conditions such as initial discounts, negative amortization when mortgage payments are too small and there's not enough money to pay the interest at the beginning of the loan, future conversion to fixed-rate mortgage requirements, or prepayment requirements.

Some of these features can be desirable, but not all. Let's take a closer look at more specific adjustable-rate mortgage pros and cons.

Adjustable-Rate Mortgage Pros And Cons

Adjustable-rate mortgages have their share of advantages and disadvantages. Consider the following:

Advantages

  • Lower initial interest rates compared to fixed-rate mortgages –Lower rates means lower payments which will give you the opportunity to increase your savings.
  • There’s a possibility that interest rates can drop further –The interest rate depends on market performance, so if market rates fall, your interest rate will also drop. It's more likely to happen if you start your adjustable-rate mortgage when interest rates are high.
  • If you don’t have plans to stay in your house for a long time, then an ARM might work out best – There is usually a fixed number of years at the initial low interest rate meaning you you can save money using this type of loan if you sell your home before the interest rate adjusts.
  • Adjustable-rate mortgages have interest rate caps, which limits both how quickly the interest rate can rise and how far it can go up – This allows you to calculate the “worst-case scenario” using the ARM Mortgage Calculator.

Disadvantages

  • Monthly payments can increase when market interest rates rise – Most home buyers worry about ARMs when interest rates are very low because the perceived risk is that interest rates can only rise. The result would be increasing payments that can wreak havoc with your household budget.
  • Beware of special loan terms – Most ARMs are pretty straightforward but some have conversion or prepayment requirements that can significantly impact the total cost of the loan. Make sure you read the fine print.
  • The first interest rate adjustment might not be limited by the cap – This can be particularly dangerous because your payment can not only rise, but it can rise dramatically in a single adjustment possibly becoming unaffordable.
  • Adjustable-rate mortgages can cause stress – Stated simply, adjustable rate mortgages are riskier because the interest rate risk has been transferred from the lender to you. Your payment is no longer fixed and you can't budget. This uncertainty can be stressful for some homeowners.

Conclusion

Adjustable-rate mortgages aren't necessarily bad, but they have specific characteristics that make them only appropriate under certain conditions. They are not for everyone. Before making a decision, it is important to do your research and compare loan options so you can make a fully informed decision.

Related: Why you need a wealth plan, not a financial plan.

Just like any other long-term loan, plan for the future. If you are looking at living in the home for a short period of time, an adjustable-rate mortgage may be the best option for you. But if you are planning to live in the home for a longer period of time, you may be better off with a fixed-rate mortgage.

Use this ARM Mortgage Calculator to begin your research process today!

ARM Mortgage Calculator Terms & Definitions

  • Mortgage – The charging of real (or personal) property by a debtor to a creditor as security for a debt on the condition that it shall be returned on payment of the debt within a certain period.
  • Adjustable-Rate Mortgage (ARM) – A mortgage whose interest rate is adjusted periodically to reflect market conditions.
  • Initial Interest Rate – Sometimes known as the teaser rate, it is the first interest rate charged on the mortgage. (On an adjustable-rate mortgage, this rate may be for as long as five years or as short as one month depending on the loan terms.)
  • Margin –This is a number of percentage points that the lender adds to the index rate which will result in the adjustable-rate mortgage's interest rate.
  • Indexed Rate – An standardized, benchmark interest rate (usually LIBOR or U.S. Treasury Securities) used as the basis for the mortgage interest rate calculation by taking the sum of a benchmark index interest rate and adding a specified margin. The indexed rate is used to calculate the interest rate on an adjustable-rate mortgage (ARM).
  • Adjustment Period – The period that elapses between the adjustment dates for an adjustable-rate mortgage.
  • Fixed-Rate Mortgage – A mortgage whose interest rate does not adjust during the loan term.
  • Maximum Adjustment – The highest amount an interest rate can adjust per year.
  • Loan Term – Period over which a loan agreement is in force.
  • Interest Rate – An interest rate is the rate at which interest is paid by a borrower for the use of money borrowed from a lender.
  • Fixed Interest Rate – The interest rate of the fixed-rate mortgage which will remain the same over the loan term.
  • Interest Rate Cap – The interest rate limit set for adjustable-rate mortgages (can also refer to the annual increase or decrease limits).
  • Interest – Money paid regularly at a particular rate for the use of money lent, or for delaying the repayment of a debt.
  • Principal – Denoting an original sum lent or remaining balance on a mortgage.
  • Refinance – Financing something – like a mortgage – again, typically with a new loan at a lower rate of interest.
  • Amortization – The spreading of payments over multiple periods resulting in the loan being fully repaid, both principal and interest, at the end of the loan term.

Related Mortgage Calculators:

  • Mortgage Payment Calculator With Amortization Schedule: How much will my monthly mortgage payment be? Includes taxes, insurance, PMI, and amortization schedule for handy reference.
  • Mortgage Payoff Calculator: How much extra payment should I make each month to pay off my mortgage by a specific date (and how much interest will I save)?
  • Bi-Weekly Mortgage Calculator: How much interest will I save paying my mortgage biweekly instead of monthly? How much more can I save if add an extra payment?
  • Mortgage Balance Calculator: What is my mortgage balance given the number of payments I've already made (or still need to make)?
  • Mortgage Refinance Calculator: How long will it take to break-even on my refinancing costs and what will be my total interest savings?
  • Interest Only Mortgage Calculator: How much lower will my payment be on an interest only mortgage compared to a conventional principal and interest mortgage?
  • Second Mortgage Calculator – Consolidate Savings With Refinance: How much will I save consolidating my first and second mortgages into a new first mortgage?
  • Rent vs. Buy Calculator: Should I rent or buy? What's the better deal?
  • Mortgage Affordability Calculator: How much house can I afford if I paid the same amount in mortgage as I pay in rent?
  • Balloon Mortgage Calculator: How much will I owe (balloon) at the end of the payment period?

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Arm Mortgage Calculator - Adjustable Rate Mortgage (2024)

FAQs

How do you calculate qualifying rate on ARM? ›

For all loans, the qualifying rate is based on the original loan amount and the loan amortization term. These policies apply to both manually underwritten loans and DU loan casefiles. In all cases, qualification must consider the borrower's current obligations and other mortgage-related obligations, e.g., PITIA.

How are ARM mortgage payments calculated? ›

Index + Margin = Your Interest Rate

The index is a benchmark interest rate that reflects general market conditions. The index changes based on the market. Changes in the index, along with your loan's margin, determine the changes to the interest rate for an adjustable-rate mortgage loan.

What is the biggest drawback of an adjustable-rate mortgage? ›

However, the potential for interest rate changes, less stability and the possibility of increased monthly payments are drawbacks to consider. Ultimately, borrowers should carefully evaluate their financial situation, risk tolerance and future plans to determine if an ARM is the right choice for their needs.

How do you calculate APR on an ARM loan? ›

The APR calculation on an ARM uses the initial rate for as long as it lasts, and then uses the current value of the rate index used by the ARM, plus the margin, subject to any rate adjustment caps. It is assumed that rate index used by the ARM stays the same for the life of the loan.

How is ARM adjustment calculated? ›

To set ARM rates, mortgage lenders take an index rate and add an agreed-upon number of percentage points, called the margin. The index rate can change, but the margin does not. For example, if the index is 4.25 percent and the margin is 3 percentage points, they are added together for an interest rate of 7.25 percent.

Is it hard to qualify for an ARM loan? ›

ARM eligibility requirements are similar to fixed-rate loan underwriting criteria but can be more strict. You may need to meet the following criteria: Credit scores: You'll need scores of 620 or higher to qualify for an ARM — and you'll want to have the highest score possible to score the lowest rates.

How do you calculate ARMs? ›

The interest rate on any ARM is tied to an index rate, often the Secured Overnight Financing Rate (SOFR). Your “margin” is the amount that's added to the index rate to determine your actual rate. For instance, if the SOFR rate is 2.0% and your margin is 2.5%, your ARM interest rate would be 4.5 percent.

What are the 4 components of an ARM loan? ›

An ARM has four components: (1) an index, (2) a margin, (3) an interest rate cap structure, and (4) an initial interest rate period. When the initial interest rate period has expired, the new interest rate is calculated by adding a margin to the index.

How are payments calculated on a adjustable rate mortgage? ›

The monthly payment is calculated to pay off the entire mortgage balance at the end of a 30-year term. After the initial period, the interest rate and monthly payment adjust at the frequency specified. The amount an ARM can adjust each year, and over the life of the loan, are typically capped.

Are ARM mortgages a good idea right now? ›

So, should you take out an adjustable-rate mortgage right now? An ARM can be "a great vehicle for a person who wants to avoid the higher interest rates,” Adinolfo-Rivera says. But, she adds, they really only work for people who have a higher risk tolerance or those who plan to sell or refinance within a few years.

Is 5 year ARM a good idea? ›

A 5/1 adjustable-rate mortgage (ARM) loan may be worth considering if you're looking for a low monthly payment and don't plan to stay in your home long. Rates on 5/1 ARMs are typically lower than 30-year fixed-rate mortgages for those first five years.

Who should not get an adjustable rate mortgage? ›

For many homebuyers, the risk may not be worth it

The reality is that for many homebuyers who want the lower payment of an adjustable rate loan, the added risk is often more than they can afford to take because they don't have a big income or vast savings.

What is a typical margin for an ARM loan? ›

A typical adjustable-rate mortgage (ARM) margin can range from 2% to 3%, though it's possible to find loans with margin levels above or below those limits.

What is the current interest rate for an ARM? ›

Today's ARM mortgage rates
ProductInterest RateAPR
3/1 ARM6.49%7.78%
5/1 ARM6.56%7.83%
7/1 ARM6.69%7.88%
10/1 ARM7.03%7.97%

What is the average 5 year ARM interest rate? ›

6.839% 7.771%

How do you calculate qualifying ratios? ›

The first ratio involves the applicant's total monthly debt to total monthly income while the other calculates the total monthly debt payments versus the total monthly income. These ratios take the total annual income of a household and divide it by 12.

How do you calculate qualifying income? ›

Salary. Calculating the qualifying income for a salaried employed is fairly straightforward. Take the gross annual salary amount and divided it by 12 months. There are loan programs where a salaried employ can close on a home loan before actually starting with the new employer.

What is a qualifying rate? ›

This is the rate that banks use to determine whether or not you'll qualify for the amount you want to borrow.

What is the current rate for ARM? ›

Today's ARM mortgage rates
ProductInterest RateAPR
3/1 ARM6.43%7.82%
5/1 ARM6.68%7.92%
7/1 ARM6.78%8.00%
10/1 ARM7.03%7.98%

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