How precise is a 61 IQ score?
A 61 IQ is higher than about 0.47% of people, roughly 1 in 215 at or below, in the extremely low range. Like every score it carries a margin of error: a professional report would usually give a likely range of about 56 to 66, and psychologists treat that range, not the single number, as the result.
How far below average is 61?
An IQ of 61 is 39 points below the average of 100, or 2.6 standard deviations. About 0.47% of people of the same age score lower, the shaded sliver at the far left of the curve below.
On a test with a standard deviation of 16, such as older Stanford-Binet editions, the same result would be about 58, and on the Cattell scale, which uses 24, about 38. Why scales differ.
What an IQ of 61 tells you
IQ tests are most precise in the middle of the scale, where most people score and where tests have the most items of the right difficulty. Professional tests are built to reach this far down: the WAIS-IV, for example, reports full-scale scores from 40 to 160. Even so, a few points either way can change a person's band, which is why reports show a confidence interval.
That uncertainty is one reason a single 61 should never settle anything important. If a result like this matters, for school support, benefits or a legal question, it should come from a full assessment by a qualified psychologist, which combines the test with interviews and a measure of everyday skills.
How an IQ of 61 is classified
Different tests and manuals use different words for the same score, and the words have changed over time. Here is where 61 falls on each of the systems you are most likely to meet.
Sources: American Psychiatric Association, DSM-5 fact sheet on intellectual disability; World Health Organization, ICD-11, 6A00 disorders of intellectual development; Peltopuro, M. and others (2014), "Borderline intellectual functioning: a systematic literature review", Intellectual and Developmental Disabilities, 52(6), 419–443. WISC-V descriptors from Pearson's interpretive reports, as on our good IQ score guide.
Does 61 mean an intellectual disability?
A score of 61 on its own never makes a diagnosis. The American Psychiatric Association's DSM-5 describes intellectual disability as "approximately two standard deviations or more below the population, which equals an IQ score of about 70 or below", and requires three things together:
- Low intellectual functioning, confirmed by a clinical assessment and individually given, standardised testing.
- Difficulties with everyday adaptive skills in at least one of three domains: conceptual (language, reading, maths, memory), social (communication, judgement, friendships) and practical (personal care, money, work and school tasks).
- A start during the developmental period, in childhood or adolescence.
Severity is set by those everyday skills, not by the IQ number. That is why only about 1% of people have an intellectual disability (a 2011 meta-analysis of 52 population studies found about 10 per 1,000), even though about 2.3% score below 70 on the bell curve. Because tests have a margin of error, DSM-5 treats roughly 65 to 75 as the uncertain zone around 70.
Sources: American Psychiatric Association, DSM-5 fact sheet on intellectual disability; Maulik, P. K. and others (2011), "Prevalence of intellectual disability: a meta-analysis of population-based studies", Research in Developmental Disabilities, 32(2), 419–436; Hall v. Florida, 572 U.S. 701 (2014), which cites the DSM-5 range of 65 to 75.
Is your 61 accurate?
Low scores are the most fragile results on any test, because almost everything that goes wrong on the day pulls a score down. Common reasons include:
- Running out of time. On timed tests, including ours, an unanswered question counts as wrong.
- Nerves. A review of 238 studies found test anxiety consistently linked with lower scores.
- Tiredness. Sleep loss hits attention and speed hardest, which costs points against the clock.
- Language and format. Taking a test in a second language, on a small screen or in an unfamiliar format can lower a result without saying anything about reasoning.
What a 61 means on our test
The Assessivo test moves in steps of about 2.5 points, so it can't give exactly 61: the nearest results are 60 (2 correct) and 63 (3 correct). Every question has four options, so someone guessing every answer at random averages nine correct, a score of 78. Random guessing scores this low only about once in 379 attempts. The likeliest explanations are the clock, a refresh at the wrong moment or a very interesting phone, not your reasoning.
If any of this sounds like your session, retake the free IQ test when you are rested and have 25 quiet minutes. A score that moves a lot between attempts was never very solid.
Sources: von der Embse, N. and others (2018), "Test anxiety effects, predictors, and correlates: a 30-year meta-analytic review", Journal of Affective Disorders, 227, 483–493; Lim, J. and Dinges, D. F. (2010), "A meta-analysis of the impact of short-term sleep deprivation on cognitive variables", Psychological Bulletin, 136(3), 375–389. Guessing figures are worked out from the binomial distribution for 36 four-option questions.
What is the mental age for an IQ of 61?
The first IQ tests, for children, described performance as a "mental age": the age whose typical performance a child matched. IQ was mental age divided by real age, times 100. Run that old formula backwards and you get the figures below, for children only.
| Child's age | Performs like a typical child of about |
|---|---|
| 6 | 3 years 8 months |
| 8 | 4 years 11 months |
| 10 | 6 years 1 month |
| 12 | 7 years 4 months |
| 14 | 8 years 6 months |
For adults the idea doesn't work, which is why David Wechsler replaced it in 1939 with today's method: compare each person with others of the same age. An adult who scores 61 has an adult's knowledge, interests and experience. The score only says how their test performance compares with other adults'.
How common is an IQ of 61?
Line up 100 people of the same age and about 1 would score 61 or lower; the orange dot marks the place. In a city of a million, about 4,660 people would be at or below this level.
The bar shows the likely range on a professional test, about five points either way: 56 to 66, from the 0.17th to the 1st percentile.
How 61 compares with nearby scores
| IQ | Percentile | Classic label | Score this low or lower |
|---|---|---|---|
| 51 | 0.05th | Extremely low | 1 in 1,838 |
| 56 | 0.17th | Extremely low | 1 in 596 |
| 61 | 0.47th | Extremely low | 1 in 215 |
| 66 | 1st | Extremely low | 1 in 85 |
| 71 | 3rd | Borderline | 1 in 38 |
Questions about an IQ of 61
What percentile is an IQ of 61?
An IQ of 61 is at about the 0.47th percentile: it is higher than about 0.47% of people of the same age, and roughly 1 person in 215 scores this low or lower.
Is 61 a low IQ?
Yes. 61 is 39 points, or 2.6 standard deviations, below the average of 100. On the classic Wechsler labels it is extremely low. A single score is an estimate with a margin of error of about five points, so 61 is best read as roughly 56 to 66.
Does an IQ of 61 mean intellectual disability?
Not on its own. 61 is in the range where an intellectual disability (called a learning disability in the UK) is considered, but a diagnosis also needs significant difficulties with everyday skills that began during childhood, assessed by a qualified psychologist.
What is the mental age for an IQ of 61?
Mental age is an idea from the earliest tests for children. By the old formula, a 10-year-old scoring 61 would perform like a typical child of about 6 years 1 month. For adults it has no meaning: modern IQ tests compare adults with other adults, and an adult who scores 61 is not like a child.
Can an IQ test measure a score of 61 accurately?
Professional tests can, within a margin of error of about five points, so a 61 is best read as roughly 56 to 66. Online tests are much rougher at this level, and our own test can only report scores in steps of about 2.5 points, so 61 itself isn't one of its possible results.
Related: the IQ range chart, what counts as an average IQ, what IQ measures and misses and how to tell if an online IQ test is accurate.
Behind a single score of 61 sit several separate abilities. Read about abstract reasoning, spatial reasoning, verbal reasoning, processing speed and fluid vs crystallized intelligence, or try the free pattern recognition test.
Information and support
If a professional assessment has given you, your child or someone you care for a score like 61, these organisations explain what it means in practice and what help is available.
Want a second reading?
Take the free Assessivo IQ test when you are rested and have 25 quiet minutes: 36 questions, and your estimated score and percentile as soon as you finish.
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