IQ measures general reasoning and problem-solving ability. EQ, or emotional intelligence (EI), refers to how well you perceive, understand, use and manage emotions, in yourself and others. They are related but distinct. On current evidence, IQ is the stronger and better-measured predictor of school and job performance, while emotional intelligence adds a modest amount, mostly in jobs that involve heavy emotional demands. The popular claim that EQ matters twice as much as IQ is not supported by research.
The answer depends a lot on which "EQ" you mean, because researchers use the term for two quite different things.
What is emotional intelligence?
The scientific concept comes from psychologists Peter Salovey and John Mayer, who in 1990 defined emotional intelligence as a set of abilities, later refined (Mayer & Salovey, 1997) into four branches: perceiving emotions accurately, using emotions to help thinking, understanding how emotions develop and combine, and managing emotions in yourself and others. In their view it is a genuine intelligence, a form of reasoning about a particular kind of information.
Daniel Goleman's 1995 bestseller Emotional Intelligence brought the idea to a mass audience and broadened it considerably, folding in traits like optimism, persistence, self-control and social skill. That broader version, often called a "mixed model," is what most workplace EQ tests and trainings are built on. Mayer, Salovey and Caruso (2008) later argued that the mixed models had stretched the term to cover nearly every desirable quality other than IQ.
Ability EI vs trait EI
Researchers now distinguish two main approaches, and they behave very differently.
Ability EI is measured like an IQ test, with right and wrong answers. The best-known instrument is the Mayer–Salovey–Caruso Emotional Intelligence Test (MSCEIT), a 141-item test covering the four branches above. You might be shown faces and asked which emotions they express, or given a scenario and asked which response would best manage a colleague's frustration. Answers are scored against expert or general consensus.
Trait EI, developed most systematically by K. V. Petrides and Adrian Furnham, is measured by self-report: you rate statements like "I'm usually able to find ways to control my emotions." It describes how emotionally capable you see yourself, which makes it closer to personality than to ability. Trait EI scores overlap heavily with the Big Five personality traits, especially low neuroticism, extraversion and conscientiousness. Most mixed-model workplace EQ tests also rely on self-report, so in practice they behave much like trait measures.
| IQ | Ability EI | Trait EI and most "EQ" tests | |
|---|---|---|---|
| What it measures | Reasoning, knowledge, memory, speed | Reasoning about emotions | Self-perceived emotional skills and dispositions |
| Format | Performance test, right or wrong answers | Performance test, consensus-scored answers | Self-report questionnaire |
| Example | WAIS-5, WISC-V | MSCEIT | TEIQue, EQ-i |
| Relation to IQ | — | Modest positive correlation | Weak |
| Main overlap | — | Crystallized (verbal) knowledge | Big Five personality, self-esteem |
Ability EI correlates positively but modestly with IQ, most strongly with verbal knowledge, which makes sense: understanding emotion words and how emotions unfold is partly knowledge. Some researchers argue that ability EI belongs inside the standard hierarchical model of intelligence as one more broad ability; for that model, see types of intelligence.
Why emotional intelligence is hard to measure
Part of the reason EI evidence is weaker than IQ evidence is that EI is harder to test well. Three problems come up repeatedly:
- Who decides the right answer? On ability tests, the "correct" response is usually the one experts or most test-takers choose. That works for recognizing a smile or a frown, but it is shakier for questions about the best way to handle a difficult colleague, where reasonable people and cultures differ.
- Knowing is not doing. An ability test can show that you know the best strategy for calming a tense situation. It can't show whether you use it when you are tired, angry or under pressure.
- Self-report can be shaped. On questionnaires, people rate themselves as they see themselves or want to be seen. In hiring settings, where applicants have reasons to look good, that makes scores easy to inflate.
IQ vs EQ at work: what predicts performance
General cognitive ability is one of the most studied predictors of job performance. A major 2022 reanalysis by Sackett and colleagues lowered earlier estimates, which had been inflated by statistical overcorrection, to an average correlation of about 0.31. That is still among the better single predictors available, though no longer the clear leader it was once thought to be. (Our guide to cognitive tests in hiring covers what that number means in practice.)
For emotional intelligence, the most careful synthesis is Joseph and Newman's (2010) meta-analysis. Its main findings:
- Ability EI predicts job performance weakly and adds little once cognitive ability and personality are accounted for.
- Self-report mixed-model EI appears to predict more, but much of that apparent validity comes from overlap with things already measured elsewhere: personality, cognitive ability, self-rated performance and self-efficacy.
- Emotional labor matters. EI related to performance more strongly in jobs that require managing your own and others' emotions, such as customer service, sales and care work, than in jobs that don't.
Joseph and Newman also proposed a "cascading" model in which conscientiousness supports perceiving emotions, cognitive ability supports understanding them, and emotional stability supports regulating them, with each step feeding the next and regulation relating to performance. That model treats EI as partly built from the same traits and abilities measured elsewhere, not as a rival to them.
None of this means emotional skills don't matter at work. Handling conflict, reading a room and staying steady under pressure plainly affect how people do. The finding is narrower: current EI tests capture only part of that, and much of what they capture overlaps with personality and IQ. This is not hiring advice; any selection method should be validated for the specific job.
Where "EQ matters twice as much as IQ" came from
Two popular claims trace back to Goleman. In the 1995 book he wrote that IQ contributes at best about 20 percent to the factors that determine life success, leaving the rest to other forces. That 20 percent was a rough reading of the correlation between IQ and outcomes. The remaining 80 percent was never shown to be emotional intelligence; it includes family background, personality, opportunity, health and chance, as well as measurement error.
In Working with Emotional Intelligence (1998), Goleman reported analyses of corporate competency models suggesting that emotional competencies were about twice as important as IQ and technical skills for outstanding performance. Those analyses were not peer-reviewed tests of EI. Competency models are lists of qualities organizations say distinguish top performers, and the "emotional" category was drawn broadly enough to include things like initiative, drive and trustworthiness. They also compared people within jobs, where differences in IQ are already narrowed by hiring.
The claims spread because they were hopeful: IQ is hard to change, and emotional skills sounded learnable. That hope is reasonable in part. The specific numbers are not research findings.
IQ, EQ and relationships
For friendships and romantic relationships, emotional abilities are more relevant than IQ. Lopes and colleagues (2004) found that people who scored higher on the managing-emotions branch of the MSCEIT reported higher-quality social interactions, a link that held after accounting for personality traits. Studies using trait EI questionnaires also find that people who see themselves as emotionally skilled report more satisfying relationships, though with self-report on both sides some of that link reflects general positivity.
IQ has not emerged as a strong predictor of relationship quality in this research. Being bright doesn't make someone a better partner or friend, and being average doesn't make them worse. The skills that matter most here, such as noticing how someone feels, responding without escalating, and repairing after conflict, are learnable to a degree, and they overlap with personality traits like agreeableness and emotional stability.
So which matters more?
- For learning, academic achievement and complex problem-solving, IQ is the stronger predictor and the better-measured construct.
- For emotionally demanding work and close relationships, emotional skills matter more than tests of them can currently show, and ability EI adds some information.
- For most outcomes, neither is destiny. Conscientiousness, health, effort and circumstance each carry real weight.
If you want a sense of where your reasoning abilities stand, you can take the free test; for what an IQ score does and doesn't tell you, see what IQ is. Be cautious with free online "EQ tests," which are almost always short self-report questionnaires that measure how you see yourself.