An official IQ test: what the word actually covers, and where to take one

0 Quick Answer

There is no official IQ test, but there are three routes to an IQ score that institutions recognize, and the word official only means something once you say which route you mean. The first route is a clinical administration by a licensed psychologist using an individually administered instrument such as the Wechsler Adult Intelligence Scale, Fifth Edition, which Pearson published in 2024 for ages 16 years 0 months to 90 years 11 months, according to the WAIS-5 product page read on September 19, 2026. The second route is a supervised admission session run by a national Mensa, which produces a pass or fail against the 98th percentile and, in the United States, no score at all. The third route is a normed online battery with published reliability, such as ACIS, which produces a report you can read and share but which no Mensa accepts for admission.

The three routes answer different questions. A clinical report answers whether a diagnosis, accommodation or eligibility decision is supported. A Mensa result answers whether you qualify for one society. A normed online report answers what your profile looks like across measured domains, at a stated precision, on a stated scale. Paying more does not move you from one answer to another. The page on how much an IQ test costs prices every option in detail; this page explains what each price buys and which paper it produces.

Every figure below was read on the provider's own page on September 19, 2026 and is linked at the point of use. Prices and rules change, and the links are there so you can check the current version before you act on any of them.

1 What the Word Official Actually Covers

Official is a property of the administration and of the acceptance, never of the test itself, and the sentence "this is the official IQ test" is false whoever says it. The professional standard that governs testing in the United States, the Standards for Educational and Psychological Testing published jointly by the American Educational Research Association, the American Psychological Association and the National Council on Measurement in Education, does not designate any instrument as official. The 2014 edition describes validity as the degree to which evidence and theory support the interpretation of a score for a proposed use. That definition places the weight on the use, and a score can be well supported for one use and unsupported for another.

Three things make an administration count for a given purpose. The first is the instrument: it must have norms, which means a reference sample of known composition against which raw performance is converted to a standard score, and it must publish the reliability of that score. The page on how IQ scores are normed explains what a norm table is and why the composition of the sample matters more than its size. The second is the conditions: the person must be identified, the time limits observed, and the items protected, which in practice means a second person in the room or a proctoring system that does the same job. The third is the acceptance: the institution that will read the result has to recognize the instrument and the conditions.

Mensa International states the rule for its own purpose in one sentence on its testing FAQ page: membership is open to persons who have attained a score within the upper two percent of the general population on an approved intelligence test that has been properly administered and supervised. Every word carries weight. Approved means on the society's list. Properly administered means by the rules of the instrument. Supervised means someone watched. The same page adds that online tests cannot be used for admission, and that many tests are not valid for people under the age of sixteen.

So the word official resolves into a question with a specific answer once you name the reader of the score. For a school district deciding on a gifted placement, official means an instrument on the district's approved list administered by a credentialed examiner. For Mensa, it means the society's own session or documentary evidence of a prior supervised test. For a person who wants to know their own profile, official is the wrong word, and the right words are normed, reliable and verified. The rest of this page takes the three routes one at a time, in the order of how much paper they produce.

2 Route One: a Clinical Administration

A clinical administration is the only route that produces a signed interpretive report, and it is the only one an institution will accept for a diagnosis or an accommodation. The instrument most often used with adults in the United States is the WAIS-5. Pearson's product page, read on September 19, 2026, lists a publication date of 2024, an age range of 16 years 0 months to 90 years 11 months, and a completion time of 45 minutes for the 7 subtest Full Scale IQ or 60 minutes for the 10 primary index subtests. The same page lists a qualification level of C, which is Pearson's designation for instruments sold only to buyers with doctoral training in psychological assessment or an equivalent license. Complete kits start at 215 dollars on that page, and the record forms and scoring subscriptions are priced separately. The page on what the WAIS-5 is walks its index structure, and the page on the Stanford-Binet 5 covers the other instrument a psychologist is likely to choose.

What you receive is not a number on a screen. It is a written report in which the examiner states the referral question, describes the testing conditions, reports each index score with its confidence interval and percentile, comments on the pattern, and answers the referral question. The report is signed by a licensed professional, and that signature is what an institution is actually accepting when it accepts the result. The page on who can administer an IQ test explains the licensing levels behind the signature, and the page on the adult testing process describes what a session looks like from the client's side.

The cost of this route depends almost entirely on who signs. University training clinics, where doctoral students test under supervision, publish the lowest fees. The University of South Florida Psychological Services Center lists a Wechsler adult or child intelligence evaluation at 100 to 400 dollars on its clinic policies page, read on September 19, 2026. Private practices charge several times that, and a full neuropsychological evaluation that adds memory, attention, executive and personality measures costs more again; the page on neuropsychological testing for adults separates the two. In every case the fee buys the examiner's time for administration, scoring, interpretation, the written report and a feedback session, which is why a clinical administration is priced in hours rather than in test units.

The limits of the route are practical rather than psychometric. Waiting lists at training clinics run months. The instrument can be administered only once in a given interval without practice contamination, which is discussed below. And the report is written for the referral question, so a person who wants a broad cognitive profile for their own interest is paying for a service designed to answer a different question than the one they are asking.

3 Route Two: the Mensa Admission Session

A Mensa session produces a decision, not a score, and in the United States the society says so on the page where it sells the test. American Mensa's admission testing page, read on September 19, 2026, offers two options: local group testing proctored by chapter volunteers at 60 dollars, and private testing at an approved facility, administered electronically, at 99 dollars. The session takes between one and two hours, requires a photo ID with proof of date of birth, and may be repeated only once every eight weeks. The page then states two things that most people who search for an official test do not expect. The Mensa Admission Test is given for the purpose of admission into Mensa and not to quantify intelligence. And the society is not able to provide a detailed report with scores, percentile ranks, or an IQ score, citing Psychology Board of Texas regulations that prohibit releasing that information without a detailed interpretation.

The assessment route guide separates personal curiosity from a recipient's requirements, so a score is not mistaken for an automatically accepted document.

A qualifying result means you tested at or above 98 percent of the general population. That is the entire output. It documents a threshold, it does not document a level, and it cannot be used to compare two people who both passed. The page on Mensa's IQ test covers the session in detail and the page on high IQ society requirements lists what the other societies accept.

British Mensa runs the same threshold with different mechanics and a different price. Its IQ tests page, read on September 19, 2026, lists a supervised IQ test at 49 pounds, available in person at test centres across the British Isles or online under supervision, and a separate route for submitting prior evidence such as a full educational psychologist's report or documentary evidence of a professionally administered test, also at 49 pounds. The society also sells a 45 minute Mensa Home Test at 15 pounds that returns an indicative score and explicitly does not qualify anyone. Candidates must be over ten and a half years old.

Mensa International's FAQ adds a fact that explains why the societies are moving away from paper tests. Because test items can be leaked online, Mensa International is in the final stages of implementing computerised adaptive testing, and national groups will publish details as it rolls out. The same FAQ contains the most useful sentence on the whole subject of official scores: a result on one test of 132 can be the same as a score of 148 on another test. That sentence is about scales, and it is the subject of a later section, because it is the reason a number without its scale is not a result.

4 Route Three: a Normed Online Assessment

An online assessment is official for nothing and credible for a great deal, provided it publishes the three things that make any score interpretable: its norms, its reliability and its error. The International Test Commission set out what an internet delivered test owes its taker in its International Guidelines on Computer-Based and Internet-Delivered Testing, published in the International Journal of Testing in 2006, volume 6, issue 2, pages 143 to 171. The guidelines distinguish four modes of administration: open mode with no supervision and no identification, controlled mode where the taker is identified but not watched, supervised mode with a proctor present, and managed mode in a dedicated testing centre. Almost every consumer IQ test on the internet runs in open mode, and the guidelines are explicit that open mode scores support weaker interpretations than supervised ones.

The academic proof that an online instrument can be built properly exists. Condon and Revelle published the International Cognitive Ability Resource in Intelligence in 2014, volume 43, pages 52 to 64: a public domain item set with published item statistics, validated on a large web collected sample. The page on the ICAR test covers what it measures. What ICAR lacks is a consumer report, norms by age and a maintained security layer, which is the part a paid product is supposed to add.

What separates a normed online battery from a quiz with a number at the end is checkable before paying. A normed battery states the size and composition of its reference sample, reports the reliability of each score it prints, reports the standard error that follows from that reliability, and describes how it protects its items and detects invalid attempts. ACIS publishes those figures in its technical manual: an adult reference frame of 3,243 records across age bands from 16 to 90, a composite reliability of .9886 for the Full Scale IQ, a standard error of measurement of 1.60 points on that composite, and a higher order general factor model tested by confirmatory factor analysis. The page on reliability and validity explains what each of those terms buys the reader. The page on free versus validated IQ tests applies the same checklist to the sites that publish nothing.

The limit of this route is acceptance. No Mensa accepts an online score, as its own FAQ states. No school district accepts one for placement. No court or licensing board accepts one. An online report is documentation of a measurement, and it is honest documentation only when the measurement was done under stated conditions with stated error. It is not documentation of a clinical judgment, because no clinician made one.

5 How the Word Is Used to Sell

Most pages that rank for the phrase official IQ test are test vendors, and the word on those pages is a marketing term rather than a description of anything the buyer receives. A search on the phrase returns a set of consumer sites with the word in their brand names, their page titles or both, alongside Mensa's own pages and encyclopedia entries. None of the vendors is recognized by any body as official, because no such recognition exists. What the word signals on a vendor page is an intent to answer the searcher's question with a purchase, and the honest way to evaluate any such page is to ignore the headline and look for the four disclosures that a normed instrument makes.

The first disclosure is the norm sample. A page that reports a percentile without saying who the percentile is relative to has computed the number against something, and the something is either a published sample or the site's own visitors. A percentile computed against visitors to an IQ website is a percentile among people curious enough to take an IQ test, which is not the general population. The second disclosure is reliability. A test that reports no reliability has no basis for the precision its score implies, and a score reported to the unit with no error band is a number pretending to be a measurement. The page on the 15 point standard deviation shows how much a single point means on the scale and why an unstated error makes the units meaningless.

The third disclosure is the scale. The page on converting a score to a percentile explains why 130 on a scale with a standard deviation of 15 is the 98th percentile while 130 on a scale with a standard deviation of 16 is not quite. The fourth is the terms of payment. The page on paid IQ tests reads the billing models used across the market and finds that most complaints trace to repeating charges rather than to the score. A page that uses the word official and hides any of the four is telling you which of the two things it is selling.

The searcher's question behind the phrase is usually one of three. Some people need a document an institution will accept, and they need route one. Some people want to join a society, and they need route two. Most people want to know where they stand, in a way they can trust, and they need a measurement whose evidence they can read, which is route three done properly. The vendor pages collapse the three questions into one button, and the collapse is the whole trick.

6 The Same Person, Two Numbers: Why a Score Is Only Official on Its Scale

A score without its scale is not a result, and the sentence Mensa uses to explain this is the most important sentence in this subject. Mensa International's FAQ says that a result of 132 on one test can be the same as a score of 148 on another. The reason is arithmetic. An IQ scale is defined by two numbers, a mean fixed at 100 and a standard deviation chosen by the publisher. Wechsler scales and ACIS use 15. Older Stanford-Binet editions and some other instruments used 16, and the Cattell scale used 24. The 98th percentile, which is the Mensa threshold, sits at about 2.05 standard deviations above the mean. On a standard deviation of 15 that is 131. On 16 it is 133. On 24 it is 149. The person did not change. The ruler did.

This is why every national Mensa expresses its rule as a percentile rather than as an IQ, and why any honest report prints the percentile next to the score. The page on the IQ score chart lays the common scales side by side, and the IQ percentile calculator converts between a score and its rank for a stated standard deviation. A number circulating without its standard deviation, which describes most numbers on the internet, cannot be placed on any of those charts.

The second reason a score is tied to its instrument is norm age. James Flynn documented in 1987, in Psychological Bulletin, volume 101, issue 2, pages 171 to 191, that raw performance on IQ tests rose across 14 nations through the twentieth century. Trahan and colleagues meta-analysed the effect in 2014 in the same journal, volume 140, issue 5, pages 1332 to 1360, and estimated a gain of roughly 2.3 points per decade. The practical consequence is that a score computed against a norm table from 1997 is inflated relative to a score computed against a table from 2024, by an amount that depends on how many years separate them. The page on the Flynn effect works through the arithmetic. When a report names its norm year, it is telling you which population it compared you to. When it does not, it is asking you to assume.

The third reason is the instrument's ceiling. The WAIS-5 reports composite scores up to 160 by design, and ACIS reports to a similar ceiling because the norm frame runs out of people above it. Any number above the ceiling of a normed instrument came from extrapolation, not from a norm table, and the pages on the highest IQ ever and on high range IQ tests explain what extrapolated numbers can and cannot mean. Official, in the only sense that survives all this, means a score that names its scale, its norm year and its ceiling.

7 What Paper Each Route Produces, and Who Accepts It

The routes differ most in what you can hand to someone afterwards, and the table below is the part of this page that most readers actually need. A clinical administration produces a signed report. A Mensa session produces a letter of admission or a decline. A normed online battery produces a report you generate yourself. Each of those documents is accepted by a different set of readers, and none of them is accepted by all of them.

Employers deserve a separate line, because the phrase official IQ test for a job is common and the law is specific. In Griggs v. Duke Power Company, decided in 1971 and reported at 401 U.S. 424, the Supreme Court of the United States held that an employer may not use a general intelligence test as a condition of employment or promotion unless the test is shown to be related to the job. Employers therefore use cognitive ability tests inside validated selection systems rather than asking candidates for an IQ certificate, and the page on pre-employment cognitive tests explains how those systems work. The reason employers use them at all is documented: Schmidt and Hunter's 1998 review in Psychological Bulletin, volume 124, issue 2, pages 262 to 274, put the validity of general mental ability for predicting job performance at .51 across the research literature, the highest of any single method they examined. That figure is about the construct, not about any certificate.

The word certificate itself deserves suspicion. The page on IQ test certificates documents what is sold under that name, and the short version is that a certificate issued by the seller of an online test attests only that the seller issued it. A clinical report is authoritative because of the license behind it. A Mensa letter is authoritative because of the society behind it. A downloadable certificate has nothing behind it, and every institution that matters knows this.

8 What No Route Removes: Practice, Norm Drift and Error

Three sources of uncertainty survive every route, and an official administration reduces none of them to zero; it only reports them honestly. The first is practice. Estevis, Basso and Combs retested 54 healthy adults on the WAIS-IV after three or six months and published the result in The Clinical Neuropsychologist in 2012, volume 26, issue 2, pages 239 to 254. Full Scale IQ rose on average by about seven points at retest, with the largest gains on the perceptual and processing speed tasks, and the interval made little difference. A person who takes the same instrument twice in a year has a second score that is not comparable to the first, and every clinical protocol, every Mensa rule and every serious online battery limits retesting for that reason. American Mensa's eight week rule and ACIS's retake controls, described in its technical manual, are two responses to the same fact. The page on how to prepare for an IQ test explains which kinds of preparation are legitimate and which contaminate the score.

The second is norm drift, described above. The remedy is to read the norm year on the report and to prefer an instrument whose norms are recent. The WAIS-5's 2024 norms are the newest available for the Wechsler adult scale, and its predecessor's 2008 norms were sixteen years old when it was retired, which by Trahan's estimate corresponds to a drift of several points.

The third is measurement error, which is the one most readers skip and the one that matters most. Every score carries a standard error, computed from the reliability of the score, and the confidence interval built from that error is the honest statement of what the score can support. Harvill's 1991 instructional module in Educational Measurement: Issues and Practice, volume 10, issue 2, pages 33 to 41, remains the clearest short account of the statistic. On an IQ scale, a reliability of .96 produces a standard error of 3 points, and a reliability of .86 produces one of 5.6 points, which is our arithmetic on the standard formula rather than a figure from any manual. A report that prints a score without its error is withholding the one number that tells you how much the score means, and a page that presents a single online score as an official, exact IQ is doing the same thing with more confidence.

None of this argues against measurement. It argues for reading the whole report. A clinical report prints the interval by convention. A Mensa result prints no number at all, so the question does not arise. An ACIS report prints the standard error next to each index because the manual reports the reliability behind each one, and a reader who wants the arithmetic can check it.

9 Cost and Time, Side by Side

Priced on the same day, the three routes span two orders of magnitude, and the cheapest route is not the least informative one. The table below uses only figures read on the providers' own pages on September 19, 2026, plus ACIS's published prices. Clinical private practice fees are not tabulated because no single provider's page represents the market; our cost survey page, linked from the Quick Answer, covers them.

Two things stand out. The Mensa routes are cheaper than most people expect and deliver less than most people expect, because the society is selling admission rather than measurement and says so. And the university clinic route, which is the only one on the table that produces a signed clinical document, costs less than many online subscriptions do over a year. The ranking of online tests and the comparison of professional and online routes linked at the end of this page apply the same disclosure checklist to each option in detail.

10 Which Route Fits Which Purpose

Choose the route from the reader of the score, not from the word on the page, and most decisions become simple. If a school, an employer's accommodation process, a disability board or a court will read the result, only the clinical route produces a document they accept, and the cheapest version of it is a university training clinic if one is within reach. If the purpose is Mensa, the society's own session is the direct route and prior clinical evidence is the alternative; British Mensa charges the same 49 pounds for either. If the purpose is another high IQ society with a higher cut off, the requirements page linked above lists which tests each accepts, and many of them accept only supervised instruments with a documented score, which rules out the American Mensa session because it releases none.

If the purpose is self knowledge, which is the purpose behind most searches for the phrase, the question changes from which route is official to which measurement is honest. The page on accurate IQ tests sets out the criteria. An honest measurement names its norms, reports its reliability and its error, states its conditions, protects its items and limits retakes. It reports a profile rather than a single number, because a single number hides the pattern that makes the result useful, and the page on what an IQ test measures explains why the domains matter more than the composite for most adult readers. An honest measurement also tells you what it is not, which is what the disclosure section below does for ACIS.

If the purpose is professional, meaning a psychologist, researcher or employer who needs to administer a normed battery to other people under controlled conditions, the clinical instruments require a qualification level and a kit, and an online battery with a practitioner interface is the alternative. The page on cognitive assessment platforms compares the options on that market, and the ACIS professional suite describes how administrations are issued and reviewed from a practitioner account.

11 Ten Minutes of Checking Before You Pay Anyone

Every route can be verified from public pages in about ten minutes, and the checks are the same whether the seller is a psychologist, a society or a website. For a clinical provider, check the license on the state board's public lookup, ask which instrument and which edition will be used, ask whether the report will include index scores with confidence intervals, and ask what the fee covers. A provider using a superseded edition is not wrong, but the norm year on the report will be older, and you should know it. For a Mensa session, read the national society's own page for the current fee, the retest interval and what is released afterwards, because the United States and United Kingdom differ on all three.

For an online battery, read the technical documentation before the sales page. Find the norm sample and its size. Find the reliability of the score you will be paying for, and the standard error that follows from it. Find the statement of how items are protected and how invalid attempts are handled. Find the scale, meaning the standard deviation, and the ceiling. Find the refund terms, and read the exclusions rather than the headline, because the exclusions are where policies live, as the section on billing models above showed. If any of the six cannot be found, the site has answered the question of whether its score is a measurement.

Then check the reverse: what the seller says the result is not. A clinical provider will tell you a single administration does not settle a diagnosis. Mensa tells you its test does not quantify intelligence. An honest online battery tells you its report is not accepted for admission or placement. A seller that claims its result is official for everything has described a document that does not exist.

12 Where ACIS Sits, and What a Buyer Should Do

We sell a paid online assessment, so treat this section as a disclosure and check it against the rest of the page. ACIS is route three. It is not official for Mensa admission, school placement, disability determinations or any legal purpose, and nothing on this site claims otherwise. What it is is a normed, timed battery of 20 subtests with published evidence: an adult reference frame of 3,243 records across age bands from 16 to 90, a technical analysis set of 2,750 complete records used for the factor analysis and reliability work, a Full Scale IQ composite reliability of .9886 with a standard error of 1.60 points, and a higher order general factor model whose fit statistics are printed in the technical manual. Each index and each subtest is reported with its own reliability and standard error, and the manual states which coefficient was used for which score.

The prices are one time. The Quick form, 6 subtests, is 15 dollars and takes about 45 minutes. The Optimized form, 13 subtests, is 30 dollars and about 110 minutes. The Full Scale form, 20 subtests, is 50 dollars and about 175 minutes, and it is the only form that reports a Full Scale IQ, because the composite requires all 20 subtests. A Custom form lets a buyer select subtests and is priced per subtest on the order page; any domain completed in full returns its index. Five subtests can be taken free without a card. Access to a purchased form stays open for 30 days, so the sessions can be split. There is no subscription and no renewal. The quality guarantee is a full refund within five days if the report does not deliver the features described at checkout or a technical issue prevents access to the results; it is not a refund for disliking the score, and the terms say so.

The limits are the ones this page has already applied to everyone else. ACIS is self administered, which the International Test Commission would classify as controlled mode rather than supervised mode, and the technical manual states that the score therefore depends on integrity controls, retake limits and completion requirements rather than on a proctor. The norm frame is English speaking adults, so the scores are not interpretable for children or for people tested in a second language they do not use daily. The ceiling is set by the norm frame, and the manual is explicit that rarity language above it is compressed. One subtest, Spatial Navigation, was retired on September 7, 2026 and replaced by Layer Rotation in the Visual Spatial Index, and the manual's notice says the affected tables will be reissued with the next edition; a buyer today should read that notice before interpreting the Visual Spatial Index. The manual also states that ACIS is not designed to treat repeated practice attempts as equivalent to first valid completions, which is a limit and a safeguard at once.

What a buyer should do follows from the purpose. If you need a document an institution accepts, go to route one and treat this page as a map. If you want Mensa, go to route two, and consider the ACIS free trial as a way to see a profile before deciding whether the session is worth booking. If you want to know your own profile at a stated precision, read the manual, take the free subtests, and buy the form whose indices answer your question. The one thing not to do is to pay a site that uses the word official and publishes nothing, because the word is free and the evidence is not.

13 Sources Behind This Page

Every figure above is traceable to one of the following, and each is linked at the point where it is used. Prices, fees and rules were read on the providers' own pages on September 19, 2026 and will change. The standard error figures for reliabilities of .96 and .86 are our arithmetic on the standard formula, standard deviation times the square root of one minus reliability, and are labelled as such.

• American Mensa. Take the Mensa Admission Test. us.mensa.org, read September 19, 2026.
• Mensa International. Getting your IQ tested: FAQs. mensa.org, read September 19, 2026.
• British Mensa. IQ testing and puzzles. mensa.org.uk, read September 19, 2026.
• Pearson. Wechsler Adult Intelligence Scale, Fifth Edition (WAIS-5), product page with publication date, age range, qualification level and completion time. pearsonassessments.com, read September 19, 2026.
• University of South Florida Psychological Services Center. Clinic policies and fees. usf.edu, read September 19, 2026.
• American Educational Research Association, American Psychological Association and National Council on Measurement in Education. Standards for Educational and Psychological Testing, 2014 edition. apa.org.
• International Test Commission. International Guidelines on Computer-Based and Internet-Delivered Testing. International Journal of Testing, 2006, volume 6, issue 2, pages 143 to 171.
• Condon D M and Revelle W. The International Cognitive Ability Resource: Development and initial validation of a public-domain measure. Intelligence, 2014, volume 43, pages 52 to 64.
• Flynn J R. Massive IQ gains in 14 nations: What IQ tests really measure. Psychological Bulletin, 1987, volume 101, issue 2, pages 171 to 191.
• Trahan L H, Stuebing K K, Fletcher J M and Hiscock M. The Flynn effect: A meta-analysis. Psychological Bulletin, 2014, volume 140, issue 5, pages 1332 to 1360.
• Estevis E, Basso M R and Combs D. Effects of practice on the Wechsler Adult Intelligence Scale-IV across 3- and 6-month intervals. The Clinical Neuropsychologist, 2012, volume 26, issue 2, pages 239 to 254.
• Harvill L M. Standard error of measurement. Educational Measurement: Issues and Practice, 1991, volume 10, issue 2, pages 33 to 41.
• Schmidt F L and Hunter J E. The validity and utility of selection methods in personnel psychology: Practical and theoretical implications of 85 years of research findings. Psychological Bulletin, 1998, volume 124, issue 2, pages 262 to 274.
• Supreme Court of the United States. Griggs v. Duke Power Co., 401 U.S. 424 (1971). Justia.
• ACIS. Technical manual: structure, norming, reliability and validity, version 1.4 with the notice of September 7, 2026. acisiq.com/technical-manual.

14 Frequently Asked Questions