how IQ is calculated ?
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An intelligence quotient or IQ is a number derived from a set of standardized tests developed to measure a person's cognitive abilities ("intelligence") in relation to their age group. An IQ test does not measure intelligence the way a ruler measures height (absolutely), but rather the way a race measures speed (relatively); IQ is described as a "quotient" because, originally, it represented the ratio between a person's "mental age" and actual chronological age.\n\nIts not based on a formula,but on what answer you provide for each question
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IQ scores are normallized so that the mean (average) is 100 and the standard deviation is 16.  Also, IQ scores are normally distributed.  So, using this information, you are 1.69 standard deviations above average, which puts you at the 95th percentile, meaning that your IQ score is as good or better than 95% of all IQ scores.
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150\n\nWhat is YOUR IQ level genius?????
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Look in the Yellow Pages for "Psychologists."  Many will offer IQ tests.\n\nIf you have ACT, SAT, GRE, or other tests, the Source link will let you estimate IQ from them.\n\nI'm quite interested in this subject.  You can contact me through the e-mail address in my profile.
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It depends what test and what kind of scores they generate.\n\nSome publishers like using percentiles, T-scores, or the most common, Standard Scores. The highest Standard Scores on a "real" IQ test usually do not go higher than 145.\n\nHere are the following standard score descriptions.\n\nlower than 69 Mentally retarded range\n79 to 70 borderline\n80 to 89 below average\n90 to 109 is average\n110 to 119 High Average\n120 to 129 Superior\n130+ Gifted range
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The age thing has nothing to do with it because IQ points already take into consideration your age.  The definition of IQ (intelligence quotient) is the following:\n(Mental Age / Chronological Age) x 100 = IQ\nThat means that mathematically, if your mental age and your actual chronological age are the same, then they cancel each other out and come out to the number 1, and 1 x 100 is 100.  That means that the average IQ test score, when your mental ability cooresponds directly to how old your are, is 100.  \n\nIf your IQ is 113, that means that your mental ability is a bit higher than your actual age would suggest.
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There is little accuracy in IQ tests, because intelligence can only be described with ordinal measurement, i.e.  highest, next highest, etc.  So IQ results can only be used in a comparative sense.  In addition, the concept of "intelligence" is complex and vague so only generalized comparisons can be made.  Note that part of the definition of IQ is that the average is defined at 100.  So, if we could get a concrete measurement of total human intelligence, the average would always be 100, no matter whether the true amount changed or stayed the same.\n\nMany online "IQ tests" are not true IQ tests anyway.  The only truly valid IQ tests are those administered by professionals.   A real IQ test measures pattern recognition and problem solving abilities; ideally patterns and problems that the testee has never encountered before.  A really good IQ test should not even be language dependent, except for the basic instructions to start the test.\n\nMany online "IQ tests" include questions about math, science, etc.  While these are valid questions, they are measuring knowledge, which is quite a different thing from intelligence.\n\nThis isn't to say that IQ isn't valid or useful.  There is a distinct difference between people with high vs. average vs. low IQ.  However, outside of a clinical setting, the use of IQ is doubtful.
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There are TWO IQ measurements. For children, IQ is the ratio between "intellectual age" and "real age". For example, IQ 150 means that a 10-year old can think like a 15-year old.\n\nFor adults, IQ is normalized to 100 by definition, meaning that 100 IS average. This means that if most people respond correctly to 15 out of 50 questions in a test, 15/50 is made equal to IQ 100 (the test is "calibrated"). \n\nThe IQ distribution is normal (gaussian, bell curve) and most people (95%) are expected to have an IQ of mean (=100) plus or minus 2 standard deviations (SD). This works for all normal distributions and tells us that if your IQ is 100+3*SD, for example, you are in the top 1/1000 of the population. The standard deviation varies between tests but is generally held to be equal to 15 IQ points. \n\nTo sum this up, 95% of people are roughly between 100+/-2*SD = 100+/-2*15 putting them in the 70-130 bracket. Anything below 70 is quite problematic and is classified as mental retardation. Anything above 130 is quite rare, but bear in mind that most tests on the internet are not designed to reliably discriminate between high IQs. \n\nI tend to take "genius" results with a bit of salt (like penis measurements, many people will exaggerate). I also tend to think that other qualities, like patience, resolve and persistence are more important in the long term. Most jobs are not limited by IQ and you can get very very far with a modest IQ of 110-120, for example.
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IQ tests are usually standardized to produce a score, based on the amount of questions you answer correctly and the difficulty of them.\n\nHistorically IQ has been mental age divided by chronological age, but in adulthood, this way of measuring is faulty.  Hence the point-scored tests.
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Have a look here:\nhttp://www.iqtest.com/
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It is called IQ,but it is not followed by any units. It is an integer,thats it.
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Generally, IQ tests have a mean of 100 and a standard deviation of 15.  Most people are between 85 and 115.  A person with an IQ of 130 or higher is considered to be a genius; a person with an IQ of 70 or below is considered to be mentally retarded.\n\nSpecifically, average is 100, and any score above 100 would be above average.
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IQ tests follow a sysetm of normal distribution. If the IQs of the entire population were put into a graph you would get whats known as a bell jar curve; a symmetrical line peaking in the middle. The value at this mid point would be 100. So the average IQ score is 100. A bit long winded, I know, but I thought just writing 100 looked a bit thin!
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http://www.highiqsociety.org/iq_tests/
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You probably can't find such a website.  I don't believe there is one.  Average IQ ranges from 85 to 115, low average to high average.
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The average IQ of a 15 year old is 100. IQ scores are age adjusted, so the average is always 100 for the most commonly used IQ scales. The average range, and IQ should always be thought of as a range, not an exact score (IQ tests are not perfectly accurate) is really more like 90-110.
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My earlier response (when you asked this question before) indicated that different IQ tests have different scales of measurement.\n\nSo if you know someone with an IQ of 228 and you want to know what that means, you need to find out what instrument was used to give them that number.  Then find out what percentile that puts them in.  Or--perhaps simpler--ask them what percentile their IQ is in, rather than what their "score" is.\n\nThe only time I had an "official" IQ test done, my score was around 140.  But my score was also the highest possible on that (widely respected and widely used) test, placing me in the top 1%.  A score of 228 must have been given by a different testing instrument, and you need more information before you know anything about what it means.