What IQ Do You Need for Different Jobs?

Search for the IQ needed to be a doctor, a lawyer, an engineer or a nurse and you will find confident numbers. They are answering a question that does not have the shape people think it does.

No profession has an IQ requirement. Nobody is asked for a score to enter medical school, qualify at the bar, register as a nurse or work as an engineer. What exists is occupational data showing the average scores of people already in those fields, which is a different thing, and the difference matters more than any of the numbers.

Why there is no requirement

Professions gate entry on demonstrated performance, not measured potential. Exams, degrees, clinical hours, training contracts, licensing boards, portfolios. Every one of those is a test of what you have actually done, and none of them is an IQ test.

This is not an oversight. Performance-based gates are more defensible, more directly related to the work, and in several jurisdictions less legally fraught than cognitive testing. A medical school that admitted on IQ scores rather than results would be making a worse decision as well as a stranger one.

So when you read that a doctor needs an IQ of 120, the accurate translation is: people who completed medical training have averaged around there on tests administered in occupational research. That sentence is much less useful, which is presumably why nobody writes it.

What the occupational data shows

With that framing in place, the figures are still worth seeing. These are broad occupational bands from the research literature:

Note how compressed that whole column is. The distance from unskilled labour to theoretical physics is roughly 35 points, or a little over two standard deviations, across the entire span of human work. The gaps between adjacent rows are mostly five points, which is inside the measurement error of a single test.

Three ways these numbers mislead

Worth internalising before you compare yourself with any of them.

• The overlap is enormous. A group with a median of 125 contains plenty of people at 110 and plenty at 140. The distributions for adjacent occupational bands overlap almost entirely, which means knowing someone’s profession tells you very little about their score and the reverse is even weaker.
• They describe selection, not demand. Fields with long academic pipelines filter on exams and grades that correlate with cognitive ability. The people at the end therefore average higher. That is a fact about the filter, not a measurement of what the job requires.
• The data is old and coarse. Much of the occupational literature dates from the 1990s and early 2000s, grouped into broad categories that flatten enormous variety. “Software developer” in 2002 described a different population from today.

The one threshold that does appear

There is a single figure in this literature that behaves a bit like a threshold, and it is lower than most people expect.

In Gottfredson’s (1997) synthesis, virtually every occupation accommodates people down to about IQ 110, with employment options narrowing gradually below that and sharply toward the bottom of the range. Around 110 also appears to be where people can generally learn a great deal independently and from the standard university teaching format, and around 120 is where people become competitive for the most cognitively demanding roles.

Those are statements about typical accessibility across large groups, not gates anyone is stopped at. People below each figure succeed in those roles constantly. The detail is in our guide to an IQ of 110.

What actually gates entry to a profession

If you are asking this question because you want to know whether a career is open to you, these are the things that actually decide it:

• Examination performance, which is what admissions committees see
• Sustained effort over years, which most professional pipelines are designed to test
• Money and time, which gate medicine and law harder than ability does
• Access to the pipeline: work experience, placements, contacts, knowing the route exists
• Conscientiousness, independent of ability and at least as predictive of getting through

On the last point, the evidence shifted recently and in a direction worth knowing. Sackett and colleagues (2022) found that decades of meta-analyses had systematically overcorrected for range restriction, and revised the correlation between cognitive ability and job performance down to about 0.31, placing it below structured interviews at 0.42. A correlation of 0.31 accounts for under ten percent of the variation in how people actually perform.

Do employers test for it?

Some do, usually not under that name. Cognitive ability tests, aptitude tests, situational judgement tests and the Wonderlic all appear in hiring processes, particularly in graduate schemes, consulting, finance and parts of the public sector.

Formal IQ testing in hiring is considerably rarer than the search volume suggests, and in the United States it is constrained by employment discrimination law in ways that shaped the whole industry. That is a subject of its own, covered in our guide to whether IQ tests are legal for hiring.

Frequently asked questions

The bottom line

There is no IQ you need for any job, because no profession asks for one. The occupational averages are real but describe who got through a filter rather than what the work demands, they overlap almost completely between adjacent fields, and the entire range from unskilled labour to theoretical physics spans about 35 points.

The closest thing to a genuine threshold in the research sits around 110, above which essentially every occupation stays accessible. Beyond that, what decides whether a career is open to you is exam performance, sustained effort, money, access and conscientiousness, and the evidence now puts cognitive ability below structured interviews as a predictor of how you will actually do once you are in.