The ECI uses abstract matrix reasoning, pattern analysis, and sequential logic to estimate your IQ — with Mensa-level accuracy.
Results in 10 minutes. Free to take.
Scientifically structured. Tamper-proof. Server-side scored.
25 questions drawn from a 1,000-item bank — matrix reasoning, pattern recognition, and sequential logic — randomly selected and uniquely worded each session.
Difficulty adapts within the item bank to target your ability range.
Your answers are scored server-side using Item Response Theory (IRT). IQ is estimated via z-score conversion: IQ = 100 + θ × 15.
Norm-referenced against 10,000-person calibration sample.
Instant IQ estimate, percentile rank, and 4-domain cognitive profile. Unlock a full PDF certificate with confidence intervals and Mensa probability.
Verification code for professional credential sharing.
IQ follows a normal distribution. Most people score between 85 and 115.
25 questions across 4 cognitive domains
3×3 abstract grids. Identify the rule governing rows, columns, and diagonals.
Symbolic sequences. Find the hidden rule linking each element.
Conceptual relationships. A is to B as C is to ?
Arithmetic, geometric, and combinatorial series.
The assessment achieves a standard error of measurement (SE) below 0.35 θ units at moderate-to-high ability levels — equivalent to a ±5 IQ point 95% confidence interval. This matches the precision of many commercially published IQ instruments.
No. The ECI is an independent online assessment and is not affiliated with Mensa International. However, scores at or above the 98th percentile (IQ ≥ 130) are consistent with typical Mensa qualification thresholds. We provide a Mensa probability estimate in the full report.
Each session draws 25 questions from a 1,000-item calibrated bank, randomly selected and uniquely worded by AI so repeat test-takers see a fresh set. 25 items provides strong statistical reliability while keeping the assessment under 10 minutes — long enough for precision, short enough to avoid fatigue.
Yes, with a 48-hour cooldown to prevent score inflation from practice effects. A retake is included with the $79 one-time upgrade. Score trajectory across sessions is shown in that report.
Responses are used solely for scoring and psychometric calibration. We do not sell personal data. You may delete your account at any time. See our privacy policy for details.
10 minutes. Psychometric precision. Find out where you actually stand.
Begin the Assessment