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You must read the loan contract carefully and find out what index is being used, the 1-year Treasury rate is a common one. You will be paying your rate based on how that index goes up and down over the course of your loan. There are many types of ARMs out there too.

Without charts and graphs it is difficult to explain the math but more important than APR is EAR (effective annual rate).

APR is pretty much the rate per compounding cycle. Most home loans are set up this way. If you have an interest rate of 13% APR compounded monthly the EAR is closer to 13.81%. The formula is ((1+.129949/12)^12)-1 The 12s in the equation represent the monthly compounding cycle.

The ARM will be a 3/1, 5/1, 7/1, or 10/1. * the first number tells you how long the fixed interest-rate period will be * the second number tells you how often the rate will adjust after the initial period. Other Types based on 30 year loans will be 2/28, 3/27, 5/15, ect...

15 year loans 1/14, 2/13, ect....

* the first number tells you how many years the fixed interest-rate period will be * the second number tells you the number of years the rates on the loan will be adjustable These loans usually are adjusted every 6 months.

Basically all you need to know is you will be getting a pretty good deal for the first period of the loan and screwed blue in the the second period.

Take a look at http://www.federalreserve.gov/pubs/arms/arms_english.htm#types

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Q: How do you calculate the apr on an adjustable mortgage?
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What is the formula for calculating APR for an adjustable rate mortgage?

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How do you calculate apr on an adjustable rate mortgage?

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