# What Percentage Has an IQ of 120? Top 9%, About 1 in 11

Source: https://iqcat.vercel.app/en/blog/iq-120-percentage
Published: 2026-07-11
Publisher: NekoIQ (https://iqcat.vercel.app)
Tags: IQ基礎, 割合

> An IQ of 120 corresponds to roughly the top 9%, about 1 in 11 people. We explain how it compares with IQ 115 and IQ 130, the deviation-score conversion (about 63), and where it sits in society, with distribution data.

## Key takeaways

- An IQ of 120 sits +1.33 standard deviations above the mean — the top ~9%, or about 1 in 11 people.
- It converts to a Japanese deviation score of about 63 — roughly the top three in a class of 35.
- It sits midway between IQ 115 (top ~16%) and IQ 130 (top ~2%).

An IQ of 120 is a frequently searched score — clearly above average, but short of the common gifted benchmark of 130. Here is how rare it actually is, along with the distribution logic behind the number.

## An IQ of 120 is in the top 9% or so

On a normal distribution with a mean of 100 and a standard deviation of 15, an IQ of 120 sits about +1.33 standard deviations above the mean. That corresponds to roughly the top 9%, or about 1 in 11 people. In a school class of around 35, that is roughly the top 3 students. You can see the full shape of the distribution in the [IQ distribution data](https://iqcat.vercel.app/en/data/iq-distribution).

> Figure: normal-distribution bell curve with the target IQ range shaded

## Compared with IQ 115 and IQ 130

One step down, IQ 115 (+1 SD) is about the top 16%, roughly 1 in 6. One step up, [IQ 130](https://iqcat.vercel.app/en/iq/130) (+2 SD) narrows sharply to the top 2%, about 1 in 50. IQ 120 sits right between the two, and converts to a deviation score of about 63. The conversion is explained in [how to convert between IQ and deviation scores](https://iqcat.vercel.app/en/blog/iq-deviation-conversion).

## What kind of level is IQ 120?

Statistically, it is often described as a band commonly seen among university graduates and in intellectually demanding professions. But the link between IQ and academic or career outcomes is only a moderate correlation, and outcomes vary widely even within the same score band — a point we cover honestly in [the relationship between IQ and income](https://iqcat.vercel.app/en/blog/iq-and-success).

## The number is only a relative position

An IQ of 120 indicates your relative position within your age group; it is not an absolute quantity of ability or a guarantee about the future. Scores can also shift by several points depending on the test and your condition on the day. You can see where each score falls in the [IQ reference table](https://iqcat.vercel.app/en/iq).

## Find out where you stand

If you want to know which band you fall into, the [free IQ test](https://iqcat.vercel.app/en/start) gives you a balanced estimate of your IQ, deviation score, and top percentile. Start by checking where you stand today.

## Frequently asked questions

### What percentile is an IQ of 120?

About the top 9%. It lies +1.33 standard deviations above the mean on a normal distribution with SD 15 — roughly 1 in 11 people.

### What deviation score does an IQ of 120 equal?

About 63, calculated as 50 + (120 − 100) ÷ 15 × 10.

### Is an IQ of 120 high?

It is clearly above average, though below the IQ 130 (top ~2%) often used as a giftedness benchmark.

## Disclaimer

NekoIQ provides estimates for entertainment and self-understanding. It is not a medical, clinical, or official psychological assessment. Percentages are derived from a normal distribution with mean 100 and SD 15.