What Is an IQ Test? Scores, Ranges & How to Improve

What an IQ test actually measures

IQ — short for Intelligence Quotient — is a score that compares your performance on a standardized set of cognitive tasks to the rest of the population. Modern tests like the WAIS-IV and Stanford–Binet 5 don't measure a single "intelligence." They sample several domains:

• Verbal reasoning — vocabulary, analogies, comprehension
• Perceptual / fluid reasoning — patterns, matrices, spatial logic
• Working memory — holding and manipulating information in mind
• Processing speed — how quickly you can scan, compare and react

Your overall IQ is a weighted blend of these. Two people can both score 115 and have very different cognitive profiles — one fast and verbal, the other slow but exceptional at logic.

How IQ scores work

IQ is scaled so that the average is 100 with a standard deviation of 15. That means scores cluster like this:

• Below 70 — about 2% of people (significantly below average)
• 70–84 — about 14% (below average)
• 85–114 — about 68% (average range)
• 115–129 — about 14% (above average)
• 130+ — about 2% (often labelled "gifted")

A few things worth knowing: scores above 145 become statistically noisy because there aren't many people in the sample to calibrate against, and a single score is an estimate — your "true" IQ likely sits within a 5–10 point band around any given test result.

Can you raise your IQ?

This is the most-debated question in cognitive science. The honest answer:

• You can significantly improve performance on the specific skills IQ tests sample — working memory, pattern recognition, mental math, reasoning under time pressure.
• Whether that counts as raising "general intelligence" (g) is contested. Some studies show transfer to untrained tasks; others find improvements stay narrow.
• What's not contested: training those skills makes you measurably faster, more accurate and more confident on cognitive tasks in everyday life.

Practically, the people who get the biggest gains follow a few principles:

1. Train daily, briefly. 5–15 minutes consistently beats 2-hour weekend sessions.
2. Push your edge. Always work just past comfortable — too easy stops growing the skill.
3. Vary the challenge. Rotate memory, math, logic and pattern tasks rather than grinding one.
4. Sleep, move, eat well. Cognition collapses without the basics — no app fixes a sleep-deprived brain.

Are online IQ tests accurate?

Short online tests can't replace a proctored clinical exam, but they're surprisingly useful:

• They sample the highest-signal question types (matrices, working memory, processing speed).
• They give you a fast estimate and a profile of strengths.
• They're great for tracking progress over time — improvement on the same test is meaningful even if the absolute number isn't perfect.

If you want an official score for school placement, employment screening or clinical reasons, you need a proctored test administered by a qualified psychologist. For everything else, a well-designed online test works fine.

How to prepare

Day-of basics: sleep 7+ hours, eat a real meal, take the test in a quiet room, give it your full attention. Long-term, the skills that move IQ scores most are working memory, processing speed, and pattern recognition — all trainable with short daily practice.

Frequently asked questions