Free Children's
IQ Test

IQ scores in both children and adults are standardised so that the average score is 100, with a standard deviation of 15. This means approximately 68% of children score between 85 and 115, and about 95% score between 70 and 130. A score above 115 is generally considered above average; above 130 is in the gifted range (roughly the top 2%). A score below 85 may indicate areas where additional support could be beneficial. It is important to note that IQ scores in children are less stable than in adults — a child's score can shift meaningfully between ages, particularly in response to educational quality, home environment and general cognitive stimulation. A single test result, especially an informal online assessment, should never be treated as a fixed or permanent measure of a child's ability.

Formal cognitive assessments designed for young children can be administered from around age 2–3, though these early assessments have limited predictive validity for later intelligence. The most reliable standardised assessments — such as the WISC-V — are normed for children from age 6 through 16, and this is the age range this test targets. Below age 6, cognitive assessment is less stable because many cognitive abilities are still in rapid developmental flux. Between ages 6 and 16, assessments become increasingly reliable, with results from middle childhood (ages 8–12) generally being more predictive of adult cognitive ability than results from early childhood.

An IQ or cognitive ability test measures underlying reasoning capacity — the child's ability to think, reason and solve problems — independent of what they have specifically been taught. A school achievement test (such as SATs or end-of-year exams) measures what a child has actually learned in a specific curriculum. The two are correlated — children with higher cognitive ability tend to learn curriculum content more easily — but they measure different things. A child can have high cognitive ability but low achievement (if they have not been well taught or are disengaged), or reasonable achievement but more moderate cognitive ability (if they are highly motivated and diligent). This distinction is important for identifying children who may be underperforming relative to their potential.

Children's cognitive abilities are more malleable than adults' — the brain's plasticity in childhood means that environmental enrichment, high-quality education and cognitive stimulation have measurable positive effects on measured intelligence, particularly in early and middle childhood. The strongest evidence supports the impact of: high-quality early education, rich language environments (being read to, having extended conversations with adults), diverse cognitive challenges and play, good nutrition and sleep, and reduction of chronic stress. The Flynn effect — the well-documented phenomenon of rising average IQ scores across generations worldwide — demonstrates that population-level intelligence is highly responsive to environmental changes, particularly improvements in education and nutrition. Individual children respond similarly to improvements in their immediate cognitive environment.

If you suspect your child has exceptional cognitive ability, the most important step is to seek a formal assessment by a qualified educational psychologist — informal online tests, including this one, cannot provide the level of measurement precision required to identify giftedness reliably. Signs that may warrant formal assessment include: reading well above grade level, exceptionally rapid learning across multiple domains, intense curiosity and depth of questioning, unusually advanced vocabulary and abstract thinking, and strong performance on informal cognitive tasks. Many schools have referral processes for gifted assessment. If your child's school does not, a private educational psychologist assessment will provide the most comprehensive and actionable picture of your child's cognitive profile.