Is 158 a Good IQ Score?

A century ago, Terman's original Stanford–Binet manual labeled scores at this level "genius or near genius." Today's professional tests dropped that word — the current child scale simply says extremely high for everything past its top line. Whatever the label, 158 is 28 points beyond the Mensa cut-off of 130, which itself marks roughly the top 2 in 100.

Scale matters up here more than anywhere. The same performance reads about 162 on the Stanford–Binet scale and about 193 on the Cattell scale. A big number from an unnamed online test could be on any of these scales, or none. If a score like this matters to you, a supervised test from a psychologist is the only version that carries weight — Mensa, for instance, accepts no online results.

What the number doesn't do is script a life. Studies of profoundly able students find remarkable outcomes on average, but they studied selected groups, and averages aren't promises. Links from IQ to income are modest at every level. And no test measures imagination, character or wisdom.

Long-term US studies have tracked the most able young people, picked out by very high test scores. On average they found strong outcomes: advanced study and demanding careers at rates well beyond typical. Abstract reasoning, fast learning and comfort with deeply layered problems are the common thread in that research.

Two honest limits. First, those studies followed selected, supported groups, so the results describe what's common at this level, not what's automatic. Second, research finds no standard weakness that comes with a very high score — no reliable social or emotional cost. People at this level vary as widely as anyone in everything the test doesn't touch.

Personality research adds that steady follow-through carries weight beyond ability at every level. At this rarity, what published research can say about any one person is genuinely limited.

A 193 on a Cattell-scale test is the same result as 158 here. This is the most common reason two tests seem to disagree.

Mensa accepts 130 and above on this scale. 158 clears it by 28 points.

Published job studies have no category this high — no occupation's usual worker range reaches 158. Even in the fields where top scorers cluster, a score like this sits at or beyond the top of the usual range:

• College professors and scientists — the highest usual ranges recorded
• Physicians — among the longest training pipelines
• Attorneys — dense, abstract analysis
• Engineers — layered technical work
• Senior analysts and managers — the most complex planning roles

People at this level are found in every kind of work, none of which requires it, and people vary widely inside every job. The occupational ranges come from Hauser's Wisconsin study and Gottfredson's 1997 review.

By the oldest yardstick, yes — Terman's 1916 Stanford–Binet manual called this level "genius or near genius." Modern tests dropped the word; current labels top out at extremely high. Either way, it's an exceptional score. But genius as the world uses the word means output, and no test measures that.

About 1 in 18,120 people score at this level or above. In the United States, that's roughly 18,500 people out of the whole population. For perspective, roughly the top 2 in 100 clear the Mensa line at 130 — your level sits 28 points beyond that.

Comfortably — the line is 130 on this scale, and 158 is 28 points past it. Joining still requires supervised proof: Mensa accepts about 200 in-person tests but no online results. Their admission session costs $60 with a local group, takes one to two hours, and needs photo ID.

Treat it as a signal worth checking, not a verdict. Even professional tests put the likely retake range at 153 to 163, and casual online tests swing more. Scales differ too — 158 here reads about 162 on the Stanford–Binet scale. A supervised test from a psychologist settles it.