Search for ways to boost your IQ and you will find no shortage of promises: apps that claim to rewire your brain, supplements, special music, ten-minute daily drills. It is tempting to believe your score is just one clever habit away from jumping 20 points.
The honest answer is more nuanced. Some things genuinely shift cognitive performance, some help mainly on the specific task you practice, and some simply do not hold up. Here is what the evidence actually supports.
First, what does "increasing your IQ" even mean?
An IQ score compares your performance on reasoning tasks with people your age, on a scale where the average is 100 and the standard deviation is 15. So "raising your IQ" could mean a few different things:
- Improving your underlying reasoning ability, so you think more effectively in many situations.
- Improving your score on a particular test, often through familiarity or practice.
- Removing things that drag your performance down, like poor sleep or anxiety.
These are not the same. The second is easy and largely superficial. The first is the one most people actually want, and it is the hardest to achieve. If you want a primer on the scale itself, see what is a good IQ score?.
How stable is IQ in adulthood?
IQ is one of the more stable traits psychologists measure. A person's rank relative to their peers tends to stay fairly consistent through adulthood, especially compared with childhood, when scores can move more.
That stability is not the same as being fixed. Population-wide gains over the 20th century, known as the Flynn effect, show that environments can push average performance up substantially over generations. The question is how much any one adult can move their own number.
What the research supports
Education
Of all the factors studied, education has some of the strongest evidence behind it. Large reviews of the research have found that additional years of schooling are associated with higher IQ scores, with each extra year linked to a gain of a few points. Studies that use natural experiments, such as changes in school-leaving age, suggest at least part of this is a genuine causal effect rather than smarter people simply staying in school longer.
The takeaway for adults: sustained, effortful learning, especially learning that demands reasoning, is one of the most credible routes to sharper thinking.
Practice with the test format
If you retake the same type of test, your score will usually go up. Psychologists call this the practice effect. You learn the rules of the puzzles, you waste less time figuring out instructions, and you feel less anxious.
This is real, but it mostly reflects familiarity rather than a deeper change in intelligence. It is also why professional assessments are spaced out and why clinicians note when someone has been tested recently. You can read more about what these puzzles are designed to measure in how IQ tests work.
Sleep, health and stress
Many factors do not raise your ceiling so much as let you perform near it:
- Sleep: sleep deprivation reliably impairs attention, working memory and reasoning.
- Physical activity: many studies find links between regular aerobic exercise and better cognitive function, particularly with age.
- Stress and anxiety: test anxiety can measurably lower performance on timed tasks.
- Nutrition: severe deficiencies, especially in childhood, can harm cognitive development.
Think of these as removing friction. They will not make you a different thinker overnight, but neglecting them can hide what you are capable of.
What the research is mixed on
Brain-training apps
Brain-training games became hugely popular on the promise that practicing memory or speed drills would make you smarter in general. The research has been far less exciting than the marketing.
The consistent finding is that people get better at the games they practice. The contested question is transfer: whether those gains spread to untrained abilities like reasoning or everyday problem-solving. Evidence for this "far transfer" is mixed at best, and many careful studies and reviews have found little or none.
Working memory training
Working memory, your ability to hold and manipulate information in mind, is closely tied to reasoning. Training tasks such as the n-back drew a great deal of attention after early studies suggested they might improve fluid intelligence. Later replications produced inconsistent results, and the current view is cautious: improvements on the trained task are common, broader gains are uncertain.
What does not hold up well
| Claim | What the evidence suggests |
|---|---|
| Listening to classical music makes you smarter | Early findings of a brief boost were small and short-lived, and many later studies did not replicate them |
| A supplement can raise your IQ | No supplement has strong evidence of raising intelligence in healthy, well-nourished adults |
| A few weeks of puzzles will add 20 points | Large, lasting jumps from short programs are not supported by research |
| Your IQ is completely fixed at birth | Genes matter, but education and environment also clearly play a role |
The pattern is consistent: quick fixes tend to fade under scrutiny, while slow, broad investments in learning and health hold up.
A realistic plan for sharper thinking
If your goal is to think better, not just to score better, focus on habits with real support behind them:
- Keep learning hard things. A new language, an instrument, mathematics, programming or a demanding subject keeps your reasoning engaged.
- Read widely and deeply. This builds vocabulary and knowledge, the backbone of what psychologists call crystallized intelligence. Our guide to fluid vs crystallized intelligence explains why this matters.
- Protect your sleep. It is the cheapest cognitive upgrade available.
- Move your body regularly. Aerobic exercise supports brain health over the long term.
- Manage stress. Calm, focused attention lets you use the ability you already have.
None of these will make headlines, but together they are the most credible path to a mind that works well for years.
The bottom line
You probably cannot transform your IQ with an app or a trick, and you should be wary of anyone who says otherwise. But education, sustained learning, good sleep and physical health all support stronger thinking, and practice will help you perform closer to your true ability on any given test.
If you want a baseline before you start building new habits, try our free online IQ test and treat the result as a starting point, not a verdict.
FAQ
Can you raise your IQ by 10 points?
Short programs are unlikely to produce lasting 10-point gains in genuine ability. Retaking similar tests can raise scores through familiarity, and long-term education is linked to real but gradual improvements.
Do brain games make you smarter?
They reliably make you better at the specific games you play. Evidence that those gains carry over to general intelligence or everyday reasoning is mixed, and many studies find little transfer.
Does IQ decline with age?
Some abilities, especially speed-based and novel problem-solving skills, tend to decline gradually in later adulthood. Knowledge-based abilities such as vocabulary often stay stable or keep growing for much longer.
