<p>To add to the existing answers (of which @what's gets special mention), an issue I don't think has really been addressed is the statistical reason for it being so difficult to measure extremely high IQs.</p>
<p>By design, IQ is scaled so that it's <a href="http://en.wikipedia.org/wiki/Normal_distribution" rel="noreferrer">normally distributed</a>, with a mean of 100, and a standard deviation (SD) of 15.
A <a href="http://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule" rel="noreferrer">well known feature</a> of the normal distribution is that 68% of values are within one SD of the mean, 95% within 2, and 99.75 within 3. This means that only .03% of IQ scores are more than 3 SDs from the mean: above <span class="math-container">$100 + 15*3 = 145$</span>, or below <span class="math-container">$100 - 15*3 = 55$</span>.</p>
<p>It's even more unusual to find values over 160 (4 SDs) or under 40, with 99.993% of IQs being within this range. This means that only .0035% of people are likely to have IQs over 160. If you normed your IQ test on a sample of 1 million people (which is obviously totally unrealistic), you would only find ~30 with a 160+ IQ, rendering it impossible to accurately estimate a single individuals IQ in that range.</p>
<blockquote>
<p><img src="https://i.sstatic.net/8Qne9.png" alt="" /></p>
<p>Simulated distribution of IQ for a population of 7 million (1/1000 the global population). Vertical lines indicate standard deviations (15 points). In this simulation, 238 people have IQs &gt; 160.</p>
</blockquote>

CC BY-SA 3.0
2015-02-18T17:48:42.767Z
2015-02-18T17:48:42.767Z
2020-06-17T09:55:31.633Z
Eoin
<p>What you are asking for does not really exist, no serious IQ test would ever give a score of 160.</p>

<p>IQ scores get swamped with noise more than ~30 points from the mean.</p>

<p>For example, an IQ of 160 means you are are more intelligent than 99.996% percent of people while an IQ of 150 means you are more intelligent than 99.957% of people. No test could claim to measure that difference with a strait face.</p>

CC BY-SA 3.0
2013-06-08T19:56:29.703Z
Why is that? Do you also think it would be hard to figure out if a person is higher then 99.9957% of people on earth? Or that he is richer then 99.9998% of people in his country?
z457731
CC BY-SA 3.0
2013-06-08T17:04:40.287Z
2013-06-08T17:04:40.287Z
Jensen RCM
<p>Have a look at the different High IQ societies here:
<a href="http://rationalwiki.org/wiki/High_IQ_society" rel="nofollow noreferrer">http://rationalwiki.org/wiki/High_IQ_society</a></p>
<p>The best societies to look at for 160+ are:</p>
<ul>
<li>eximia high IQ society</li>
<li>Mega Society</li>
<li>GenerIQ Society</li>
<li>Giga Society (<a href="http://www.gigasociety.com/" rel="nofollow noreferrer">http://www.gigasociety.com/</a>)</li>
</ul>
<p><strong>All of them have references to test</strong> (some of it is online).</p>
<p><em><strong>For ease of access, here are the societies from top 5% onwards</strong></em></p>
<ul>
<li>Top 5% (95th percentile; 1/20; IQ 124 sd15, IQ 126 sd16): International High IQ Society</li>
<li>Top 2% (98th percentile; 1/50; IQ 130 sd15, IQ 132 sd16): Encefálica Society, High Potentials Society, Mensa International, Mysterium Society</li>
<li>Top 1% (99th percentile; 1/100; IQ 135 sd15, IQ 137 sd16): Intertel, Top One Percent Society</li>
<li>Top 0.7% (99.3rd percentile; 1/147; IQ 137 sd15): Sunesis Society(Defunct)</li>
<li>Top 0.5% (99.5th percentile; 1/200; IQ 139 sd15, IQ 141 sd16): Colloquy (Society), Poetic Genius Society[2]</li>
<li>Top 0.37% (99.63rd percentile; 1/270; IQ 140 sd15): Infinity International Society, HispanIQ International Society</li>
<li>Top 0.3% (99.7th percentile; 3/1000; IQ 141 sd15, IQ 144 sd16): Cerebrals Society</li>
<li>Top 0.2% (99.8th percentile; 1/500; IQ 143 sd15, IQ 146 sd16): exactiq high IQ society</li>
<li>Top 0.13% (99.87th percentile; 13/10000; IQ 145 sd15, IQ 148 sd16): CIVIQ Society</li>
<li>Top 0.1% (99.9th percentile; 1/1000; IQ 146 sd15, IQ 149 sd16): Glia Society, International High IQ Society Milenija, International Society for Philosophical Enquiry, Iquadrivium Society[2], One-in-a-Thousand Society[2], Triple Nine Society</li>
<li>Top 0.003% (99.997th percentile; 3/100000; IQ 160 sd15, IQ 164 sd16): Prometheus Society, Tetra Society</li>
<li>Top 0.001% (99.999th percentile, 1/100000; IQ 164 sd 15, IQ 168 sd 16): eximia high IQ society, The Ultranet[3]</li>
<li>Top 0.0001% (99.9999th percentile; 1/1000000; IQ 172 sd15, IQ 176 sd16): Mega Society, GenerIQ Society</li>
<li>Top 0.0000001% (99.9999999th percentile; 1/1,000,000,000; IQ 190 sd15, IQ 196 sd16): Giga Society</li>
</ul>

CC BY-SA 3.0
2015-02-19T11:38:12.717Z
So if you would test the whole mankind, you would not only FIND 7 or 8 with 190 or higher, but you must find exactly 7/8 due the IQ is a relative value, not a fix number. It's not possible to have more than 8 IQ190+ people in <8.000.000.000, so it's impossible to have less then 7 IQ190+ in >7.000.000.000.
jawo
CC BY-SA 3.0
2015-02-20T13:36:10.587Z
You are absolutely right @Sempie. It is all relative, although it's not reflected like that in reality. If you would have taken a test today, they should really let you know every year how they have adjusted that number ... so your IQ should really fluctuate (slightly), depending on how others rate in their new IQ tests.
z0mbi3
CC BY-SA 4.0
2015-02-14T23:45:20.947Z
2021-01-29T20:00:10.263Z
2021-01-29T20:00:10.263Z
z0mbi3
<p>The oldest and largest high IQ society in the world is Mensa.  They offer membership only to those who have an IQ in the top 2%.  They administer their own test to qualify those who seek membership.</p>

<p>There are also online IQ tests that claim to be Mensa IQ tests, but I am unsure of their validity.  However, Mensa only recognize the results of tests that they personally supervise, so any online IQ test proclaiming you a genius is just a novelty really, as online IQ tests are not recognized as having any special significance by any 3rd party.</p>

<p>If you are really serious about knowing how your IQ compares, I would suggest getting in contact with Mensa since they are the experts about that.</p>

CC BY-SA 3.0
2015-02-16T13:45:41.323Z
Mensa is *not* a psychometrics society, and I would not suggest asking them any question that should be directed to a psychometrics expert--they are a group of people with a certain range of test scores.
Krysta
CC BY-SA 3.0
2016-05-29T03:16:05.183Z
MENSA actually accepts several different tests, although they do administer their own. I personally got into MENSA based on some IQ test I took when I was ~8. At the very least, MENSA's list of accepted IQ tests would be useful: http://www.us.mensa.org/join/testscores/qualifyingscores/
Jeutnarg
CC BY-SA 4.0
2019-07-27T12:12:49.260Z
I already took the (on-site) Mensa test. I scored in the top 10% of Mensa candidates (so top 10% of the top 2% of population). Therefore looking for more targeted tests.
z0mbi3
CC BY-SA 3.0
2015-02-16T06:06:44.730Z
2015-02-16T06:06:44.730Z
Michael Rize
<p>Is there some (preferably free) online and accurate IQ test?<br>
One which does not give me an genius IQ and then tries to sell me a diploma.<br>
I need one which measures upto 160 sd15 (or higher). Such a test would probably document its norming process somehow.</p>

CC BY-SA 3.0
2014-12-20T13:19:40.457Z
Just a note on IQ.  It is not a true measure of 'intelligence' anyway, but more of 'symbolic logic'. Intelligence is something that can not be measured accurately, although inventions such as the 'IQ Test' do make a very strong attempt.
Kraang Prime
CC BY-SA 4.0
2022-05-03T17:34:06.540Z
The short answer is no. Most online IQ tests are only there to inflate your score, then convince the gullible to buy some certificate or course or some nonsense with a price as inflated as the test score. King of the Hill captured this in an episode that had Peggy shell out $1000 to be a "certified genius" complete with getting a phony degree from The Genius Academy." The paper printed to claim that would have been worth way more money. They are looking to make you feel really great, to sell you something really worthless because the high you're riding makes an easy mark of you.
James Butler
CC BY-SA 3.0
2013-06-09T07:16:14.133Z
Also see [this question that asked about a free public domain IQ test with norms](http://cogsci.stackexchange.com/questions/199/free-online-intelligence-test-with-norm-table-high-reliability-and-must-be-pri?lq=1)
Jeromy Anglim
CC BY-SA 3.0
2013-06-09T07:21:57.490Z
Also see this [previous question about how to measure very high IQs](http://cogsci.stackexchange.com/questions/3400/how-can-psychometry-measure-the-very-high-iqs-in-adults)
Jeromy Anglim
<cognitive-psychology><intelligence><test>
Is there an accurate online IQ test for measuring 160+ IQs?
z457731
# Is there an accurate online IQ test for measuring 160+ IQs?

(Asked by: username_0 on 2013-06-08)

Is there some (preferably free) online and accurate IQ test?  
One which does not give me an genius IQ and then tries to sell me a diploma.  
I need one which measures upto 160 sd15 (or higher). Such a test would probably document its norming process somehow.

**Tags:** cognitive-psychology, intelligence, test

> **Comments:**
> **username_3**: Also see [this question that asked about a free public domain IQ test with norms](http://cogsci.stackexchange.com/questions/199/free-online-intelligence-test-with-norm-table-high-reliability-and-must-be-pri?lq=1)  
> **username_3**: Also see this [previous question about how to measure very high IQs](http://cogsci.stackexchange.com/questions/3400/how-can-psychometry-measure-the-very-high-iqs-in-adults)  
> **username_1**: Just a note on IQ.  It is not a true measure of 'intelligence' anyway, but more of 'symbolic logic'. Intelligence is something that can not be measured accurately, although inventions such as the 'IQ Test' do make a very strong attempt.  
> **username_2**: The short answer is no. Most online IQ tests are only there to inflate your score, then convince the gullible to buy some certificate or course or some nonsense with a price as inflated as the test score. King of the Hill captured this in an episode that had Peggy shell out $1000 to be a "certified genius" complete with getting a phony degree from The Genius Academy." The paper printed to claim that would have been worth way more money. They are looking to make you feel really great, to sell you something really worthless because the high you're riding makes an easy mark of you.  

---

## 4 answers

### Answer by username_5 on 2013-06-08. Score: 9

What you are asking for does not really exist, no serious IQ test would ever give a score of 160.

IQ scores get swamped with noise more than ~30 points from the mean.

For example, an IQ of 160 means you are are more intelligent than 99.996% percent of people while an IQ of 150 means you are more intelligent than 99.957% of people. No test could claim to measure that difference with a strait face.

> **Comments:**
> **username_0**: Why is that? Do you also think it would be hard to figure out if a person is higher then 99.9957% of people on earth? Or that he is richer then 99.9998% of people in his country?  

---

### Answer by username_4 on 2015-02-18. Score: 7

To add to the existing answers (of which @what's gets special mention), an issue I don't think has really been addressed is the statistical reason for it being so difficult to measure extremely high IQs.

By design, IQ is scaled so that it's [normally distributed](http://en.wikipedia.org/wiki/Normal_distribution), with a mean of 100, and a standard deviation (SD) of 15.
A [well known feature](http://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule) of the normal distribution is that 68% of values are within one SD of the mean, 95% within 2, and 99.75 within 3. This means that only .03% of IQ scores are more than 3 SDs from the mean: above $100 + 15\*3 = 145$, or below $100 - 15\*3 = 55$.

It's even more unusual to find values over 160 (4 SDs) or under 40, with 99.993% of IQs being within this range. This means that only .0035% of people are likely to have IQs over 160. If you normed your IQ test on a sample of 1 million people (which is obviously totally unrealistic), you would only find ~30 with a 160+ IQ, rendering it impossible to accurately estimate a single individuals IQ in that range.

> ![](https://i.sstatic.net/8Qne9.png)
>
> Simulated distribution of IQ for a population of 7 million (1/1000 the global population). Vertical lines indicate standard deviations (15 points). In this simulation, 238 people have IQs > 160.


---

### Answer by username_6 on 2015-02-14. Score: 3

Have a look at the different High IQ societies here:
<http://rationalwiki.org/wiki/High_IQ_society>

The best societies to look at for 160+ are:

* eximia high IQ society
* Mega Society
* GenerIQ Society
* Giga Society (<http://www.gigasociety.com/>)

**All of them have references to test** (some of it is online).

***For ease of access, here are the societies from top 5% onwards***

* Top 5% (95th percentile; 1/20; IQ 124 sd15, IQ 126 sd16): International High IQ Society
* Top 2% (98th percentile; 1/50; IQ 130 sd15, IQ 132 sd16): Encefálica Society, High Potentials Society, Mensa International, Mysterium Society
* Top 1% (99th percentile; 1/100; IQ 135 sd15, IQ 137 sd16): Intertel, Top One Percent Society
* Top 0.7% (99.3rd percentile; 1/147; IQ 137 sd15): Sunesis Society(Defunct)
* Top 0.5% (99.5th percentile; 1/200; IQ 139 sd15, IQ 141 sd16): Colloquy (Society), Poetic Genius Society[2]
* Top 0.37% (99.63rd percentile; 1/270; IQ 140 sd15): Infinity International Society, HispanIQ International Society
* Top 0.3% (99.7th percentile; 3/1000; IQ 141 sd15, IQ 144 sd16): Cerebrals Society
* Top 0.2% (99.8th percentile; 1/500; IQ 143 sd15, IQ 146 sd16): exactiq high IQ society
* Top 0.13% (99.87th percentile; 13/10000; IQ 145 sd15, IQ 148 sd16): CIVIQ Society
* Top 0.1% (99.9th percentile; 1/1000; IQ 146 sd15, IQ 149 sd16): Glia Society, International High IQ Society Milenija, International Society for Philosophical Enquiry, Iquadrivium Society[2], One-in-a-Thousand Society[2], Triple Nine Society
* Top 0.003% (99.997th percentile; 3/100000; IQ 160 sd15, IQ 164 sd16): Prometheus Society, Tetra Society
* Top 0.001% (99.999th percentile, 1/100000; IQ 164 sd 15, IQ 168 sd 16): eximia high IQ society, The Ultranet[3]
* Top 0.0001% (99.9999th percentile; 1/1000000; IQ 172 sd15, IQ 176 sd16): Mega Society, GenerIQ Society
* Top 0.0000001% (99.9999999th percentile; 1/1,000,000,000; IQ 190 sd15, IQ 196 sd16): Giga Society

> **Comments:**
> **username_7**: So if you would test the whole mankind, you would not only FIND 7 or 8 with 190 or higher, but you must find exactly 7/8 due the IQ is a relative value, not a fix number. It's not possible to have more than 8 IQ190+ people in <8.000.000.000, so it's impossible to have less then 7 IQ190+ in >7.000.000.000.  
> **username_6**: You are absolutely right @Sempie. It is all relative, although it's not reflected like that in reality. If you would have taken a test today, they should really let you know every year how they have adjusted that number ... so your IQ should really fluctuate (slightly), depending on how others rate in their new IQ tests.  

---

### Answer by username_8 on 2015-02-16. Score: 1

The oldest and largest high IQ society in the world is Mensa. They offer membership only to those who have an IQ in the top 2%. They administer their own test to qualify those who seek membership.

There are also online IQ tests that claim to be Mensa IQ tests, but I am unsure of their validity. However, Mensa only recognize the results of tests that they personally supervise, so any online IQ test proclaiming you a genius is just a novelty really, as online IQ tests are not recognized as having any special significance by any 3rd party.

If you are really serious about knowing how your IQ compares, I would suggest getting in contact with Mensa since they are the experts about that.

> **Comments:**
> **username_9**: Mensa is *not* a psychometrics society, and I would not suggest asking them any question that should be directed to a psychometrics expert--they are a group of people with a certain range of test scores.  
> **username_10**: MENSA actually accepts several different tests, although they do administer their own. I personally got into MENSA based on some IQ test I took when I was ~8. At the very least, MENSA's list of accepted IQ tests would be useful: http://www.us.mensa.org/join/testscores/qualifyingscores/  
> **username_6**: I already took the (on-site) Mensa test. I scored in the top 10% of Mensa candidates (so top 10% of the top 2% of population). Therefore looking for more targeted tests.  

---

