3/1 Adjustable Rate Mortgage (ARM)
  	This type of loan has monthly payments that are based on a 30   year   repayment          schedule and the interest rate remains fixed for the   first three years. After that time the interest rate (monthly payments)   may change year after. This is   called the adjustment period. The new   rate is based upon   changes  in a financial index  and   is calculated   by adding a specified amount to the index. The amount that   is added to   the index is called the margin. Let's say the index equals 4.5% at the   time of adjustment and the   margin equals 2.50%, the new interest rate   would be 7%. However,   adjustable loans usually have an  adjustment   cap.   So if the adjustment cap is 2%, the new rate would be 6.5%. There   is also a lifetime cap which limits how much the rate can go up or down   during the life of the loan. These loans can work out well for people   who stay in their house for the short term. 
  	
    
5/1 Adjustable Rate Mortgage (ARM ) 
    This type of loan is similar to the 3/1 ARM except for the fact that   the interest rate remains fixed for the first five years.
  	
  	
7/1 Adjustable Rate Mortgage (ARM)
This type of loan is similar to the 3/1 ARM except for the fact that     the interest rate remains fixed for the first seven years.