Mensa IQ Test Score Chart: Comparative Analysis & Percentile Conversion
An authoritative methodological breakdown of how standard deviations determine High-IQ society thresholds. Convert Wechsler, Stanford-Binet, and Cattell scales instantly, and map your intellectual rarity across the standardized population curve.
Start Mensa IQ Test1. Interactive Score Converter & Curve Simulator
Drag the slider to adjust your Wechsler IQ score and witness how it dynamically maps onto different psychometric scales and translates to real-world rarity.
Stanford-Binet (SD 16)
Used by clinical psychologists
Cattell Scale (SD 24)
Commonly used in UK/Europe
Percentile Rank
Percentage of population outscored
An IQ of 115 means you are intellectually superior, outscoring approximately 84% of the population. To qualify for Mensa, you must attain a score of 130 or higher (top 2%).
Live Normative Bell Curve Calibration
Figure 1: Your performance plotted against the standard distribution curve. The highlighted region shows standard cognitive deviations.
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Start Mensa IQ Test2. Standard Deviations & Scientific Equivalence
In psychometrics, a raw intelligence test score is completely meaningless without understanding the parameters of its distribution. Scores are calculated using standard deviations (σ) from the population mean (μ), which is always fixed at 100 by global convention.
SD 15
Used by WAIS-IV (Wechsler Adult Intelligence Scale) and most modern online screening tests. Mensa entry requires a minimum score of 130.
SD 16
Predominant in classical academic psychology batteries. Due to the wider variance index, Mensa entry requires a score of 132.
SD 24
Common in British and European testing centers. A highly spread variance profile requires an entrance cutoff of 148.
The Conversion Equation
To convert an IQ score from scale A to scale B, psychometrists isolate the standardized z-score (number of standard deviations away from the mean) and apply the target scale's deviation index.
Where σ represents the standard deviation of the respective test instrument.
3. Master Percentile Conversion Table
The authoritative psychometric look-up table mapping percentile rarities across the three core scales.
| Percentile Rank | Wechsler (SD 15) | Stanford-Binet (SD 16) | Cattell (SD 24) | Statistical Rarity |
|---|---|---|---|---|
| 99.9th (Profound Genius) | 146 | 150 | 174 | 1 in 1,000 people |
| 99.0th (Very Superior) | 135 | 137 | 156 | 1 in 100 people |
| ⭐ 98.0th (Mensa Entry) | 130 | 132 | 148 | 1 in 50 people |
| 95.0th (Superior) | 125 | 126 | 140 | 1 in 20 people |
| 90.0th (High Average) | 119 | 120 | 130 | 1 in 10 people |
| 84.0th | 115 | 116 | 124 | 1 in 6.3 people |
| 50.0th (Exact Median) | 100 | 100 | 100 | 1 in 2 people |
Methodology Note: Percentiles are calculated based on the cumulative distribution function of the Gaussian curve. Standard deviation indices are calibrated under standard psychometric distributions. Our predictive evaluations are used solely for screening and comparison purposes and are not valid as clinical psychological diagnoses.