People in the UK sometimes joke about who is the smartest and which nation would come last on an IQ ranking. Most of the time, it stays in the world of stereotypes and cherry-picked claims.
In this article, we take a more grounded approach and compare England, Scotland, Wales, and Northern Ireland using the latest available data we can responsibly cite, plus aggregated results from IQ tests taken on our website.
The goal is not to label people or put nations into boxes. These are population averages, and they do not say anything about any individual person.
Which UK nation has the lowest average IQ
Using the combined source average across LearnDrive and the Cambridge Journal paper, Wales comes out lowest at about 97.9, with Northern Ireland next at about 98.3.
Using our website results only, Wales is also the lowest at 98.1, with Northern Ireland at 98.8.
So the most defensible conclusion is that Wales tends to appear at the bottom in both published source averaging and our own test-taker data, while Northern Ireland is usually close and may appear lowest depending on which external source you rely on.
If you want to understand what a difference of one to three points actually means in practice, it helps to review what IQ is, and then see how scores are grouped on the IQ test scale.
What average IQ means and what it does not mean
An average IQ is a statistical summary of how a tested group performed on cognitive tasks such as pattern recognition, reasoning, numeracy, and some verbal tasks.
Most modern IQ scales are standardised so that 100 sits around the middle of the reference distribution, with most people clustering not far from that point.
This kind of national comparison is always a rough proxy because real-world datasets differ in sampling, test format, age structure, and how representative the participants are.
That is why we treat the results as estimates, and why we average across sources instead of relying on a single number.
It is also why we avoid turning the result into a story about innate ability. Differences at the country or nation level are often linked to education access, health, stress exposure, and socioeconomic factors, rather than anything simple or fixed.
LearnDrive explicitly frames regional variation in these kinds of environmental terms.
Data sources and how we combined them
To keep our method transparent, we used two online sources that publish UK IQ estimates and then compared them with aggregated results from IQ tests taken on our website.
Source A, LearnDrive, reports approximate average IQ ranges for 12 UK regions. It includes separate entries for Scotland, Wales, and Northern Ireland, plus multiple regions within England. Because LearnDrive uses ranges, we converted each range into a midpoint for calculation. For example, 97 to 98 becomes 97.5.
Source B, a Journal of Biosocial Science paper, estimates regional IQ across the UK using Understanding Society data and reports values for Scotland, Wales, Northern Ireland, and the English regions.
Our website data comes from people who took an IQ test on freeiqtest.uk. This is not a nationally representative sample because participants self-select, but it can still be useful as a comparison point because it reflects recent real-world test takers on one consistent platform.
How we calculated a single estimate per nation from each source
LearnDrive gives one entry each for Scotland, Wales, and Northern Ireland.
For England, it does not give one national England number, so we estimated England by averaging the listed English regions: London, South East, East of England, South West, West Midlands, East Midlands, Yorkshire and Humber, North West, and North East.
The Cambridge paper reports IQ values for UK regions, including the English regions. To estimate England, we averaged the nine English regional values in their table, and then used their published values directly for Scotland, Wales, and Northern Ireland.
The combined estimate is the average of Source A and Source B for each nation. We place our website result next to it rather than mixing it into the combined estimate, so readers can see the difference clearly.
Results by nation comparing sources
Below is a side-by-side comparison of the averages from each source and our website results.
| Nation | EN | SC | NI | WA |
|---|---|---|---|---|
| LearnDrive | 99.4 | 100.0 | 96.5 | 97.5 |
| Cambridge JBS | 99.9 | 100.9 | 100.0 | 98.2 |
| Freeiqtest.uk | 100.8 | 100.9 | 98.8 | 98.1 |
| Average: | 99.7 | 100.5 | 98.3 | 97.9 |
What this table shows at a glance
Across the combined source average, Wales is the lowest, and Northern Ireland is close behind.
In our website results, Wales is also the lowest, while Northern Ireland is higher than Wales but still below England and Scotland.
Scotland is the highest across both the combined source average and our website data, though the gap versus England is small.
The biggest disagreement between sources is over Northern Ireland. LearnDrive places it lowest, while the Cambridge paper places it around the UK average. That is why it is important to treat these as estimates and not a single definitive fact.
Why do the sources not perfectly agree
Even when two sources aim to measure the same thing, their averages can differ because they are not measuring it in exactly the same way.
LearnDrive uses a broad range and a narrative summary. When you convert ranges into midpoints and then average English regions to estimate an England figure, you introduce additional approximation.
The Cambridge paper uses a specific dataset and a defined method. It builds an IQ proxy from multiple cognitive tasks and then standardises it to an IQ style scale, which can shift regional rankings compared with other approaches.
Our website results come from self-selected test takers. That means the sample is influenced by who chooses to take our free IQ test, who chooses to finish the test, and who chooses to take it again.
It is consistent within our platform, but it is not designed to represent the whole population.
The key takeaway is that none of these numbers should be treated as a final truth. They are best treated as approximate indicators that tend to cluster within a narrow band.
What the differences probably reflect
Small differences in average IQ style scores across nations are usually better explained by environment and measurement than by anything innate.
Even a 1 to 3 point spread can appear or disappear depending on sampling and methodology. Factors commonly linked with test performance at the population level include:
Education access and attainment: Differences in funding, curriculum emphasis, teacher recruitment, and participation in further education can affect average performance on cognitive tasks.
Socioeconomic conditions: Income, deprivation, health, nutrition, housing stability, and stress exposure can influence learning and test performance.
Migration patterns: Internal migration and international migration can change the composition of who lives where, especially in large cities and economically strong regions.
Urban-rural differences: Access to services, schooling options, and test familiarity can vary by settlement pattern.
Test familiarity and language effects: Even in English-speaking contexts, differences in item style, time pressure, and vocabulary expectations can nudge averages.
This is also why it helps to frame the results through the lens of what IQ is rather than treating IQ as a single fixed trait.
How to interpret “lowest average” responsibly
If you are reading this article to find a simple ranking, here is the careful version of the answer:
Across the combined source average, Wales is lowest, and Northern Ireland is close behind.
Across our website results, Wales is also the lowest.
What this does not mean
- It does not mean people in any nation are unintelligent.
- It does not mean individuals in one nation are smarter than individuals in another.
- It does not justify stereotypes, jokes, or assumptions about capability.
A national average is just one number describing a distribution. Every nation has a wide spread of scores, with many people far above and below the average.
If you want a clearer mental model, it helps to look at the IQ test scale so you can see how most people cluster near the middle and how small differences in the mean can look larger than they really are.
Final thoughts
So, which UK nation has the lowest average IQ? On the combined external source average, Wales comes out lowest, and our website user data shows the same pattern.
The more important conclusion is that these figures are estimates with limitations, and the differences are small enough that they are best understood as reflections of sampling, measurement, and social factors rather than a statement about any individual person.