IQ Tests for Children: What Parents Should Know

How child IQ testing works

Children are assessed with instruments designed for their age, most commonly the Wechsler Intelligence Scale for Children (WISC) for school-age kids and the WPPSI for preschoolers, or the Stanford-Binet. A trained examiner works with the child one-on-one, adapting pacing, keeping the child engaged, and observing how they approach problems — not just whether they get the right answer. Scores are age-normed, so a child is always compared with other children the same age, which is why the average is 100 at every age by design.

Why young children's scores are less stable

The younger the child, the more their measured IQ can change over time. Development is uneven, attention spans are short, and a single off-day weighs heavily on a brief test. A score taken at age four is a much weaker predictor of later ability than one taken at age ten. This is a core reason professionals are cautious about labelling young children from one test, and why repeat assessment over time is sometimes recommended rather than treating an early number as fixed.

An early childhood IQ score is a snapshot of current performance under specific conditions — not a permanent verdict on a child's potential.— General principle in developmental assessment

Gifted thresholds and what they mean

'Gifted' is not a single universal cutoff — it's a band set by individual programs, schools or districts, and the exact line varies. Common reference points on the standard mean-100, SD-15 scale include:

Crucially, many gifted programs don't rely on IQ alone; they combine test results with teacher input, achievement data and portfolios. A score is one piece of evidence, not the whole picture.

Why online tests aren't appropriate for kids

Free online tests fail children specifically, for reasons that go beyond their general limitations:

• They aren't normed or validated for children, so any percentile they report is essentially meaningless for a child.
• They can't control conditions — a child's attention, mood and need for encouragement all affect performance and need a skilled examiner.
• They produce a single number with no profile, which is exactly the wrong format for understanding a child's needs.
• A misleading 'gifted' or 'low' result can cause real harm — false reassurance, unwarranted anxiety, or labels that stick.

When to seek a professional assessment

A formal evaluation by a licensed psychologist or your school's assessment team is worth pursuing when there's a concrete reason, such as:

• Your child is being considered for a gifted or accelerated program that requires testing.
• You suspect a learning disability, developmental delay, or attention difficulty affecting school.
• There's a large gap between your child's apparent ability and their school performance.
• A school, paediatrician or specialist has recommended a cognitive evaluation.

Start with your child's school or paediatrician, who can refer you to an appropriately qualified educational or clinical psychologist. A proper assessment is individualised, interpreted in context, and designed to help — which is exactly what a child deserves.