Loading...
Personality
IPIP-NEO-300 Test: Big Five Personality Assessment
Take the IPIP-NEO-300 Big Five personality test — the most scientifically validated personality assessment. Discover your scores across 5 major traits and 30 facets with 300 research-based questions. Free, accurate, and used in over 3,500 scientific publications.
questions
300
Time
45 min
Method
ipip-neo-300
Rating
4.9
What you'll learn
Your percentile scores on 5 major personality domains (OCEAN)
Detailed analysis of 30 specific personality facets
How you compare to the general population on each trait
Strengths and growth areas based on your personality profile
Career paths and environments that match your traits
Insights into your relationship and communication style
Key facts
1996
First presented
Lewis R. Goldberg
Lead developer
300
Questions
5
Personality factors
30
Facets measured
.90-.95
Reliability (α)
40+
Languages
3,500+
Citations
History & development
1981
Goldberg publishes foundational paper on lexical hypothesis
1992
Costa & McCrae release NEO-PI-R with 5 factors and 30 facets
1996
IPIP first presented at European Conference on Personality
1999
IPIP website launched with public-domain scales
2006
Landmark paper on future of IPIP in Journal of Research in Personality
2015
IPIP website restructured; now hosts 3,320+ items
About the methodology
The International Personality Item Pool (IPIP) was initiated in the early 1990s at the University of Groningen, Netherlands, under Wim K. B. Hofstee's leadership. The project assumed "the lexical hypothesis" — that important personality differences become encoded in natural language. The pool was later expanded at the Oregon Research Institute by Lewis R. Goldberg with support from an 8-year NIMH grant (1993-2001). Today, IPIP contains over 3,320 items and 250+ validated scales freely available in the public domain.
IPIP-NEO-300 measures the same five broad domains and 30 narrow facets as Costa & McCrae's commercial NEO-PI-R: Neuroticism (N), Extraversion (E), Openness to Experience (O), Agreeableness (A), and Conscientiousness (C). Each domain contains 6 facets measured by 10 items each (60 items per domain × 5 domains = 300 items). Items use a 5-point Likert scale from "Very Inaccurate" to "Very Accurate." Half items are reverse-scored. The hierarchical structure captures both broad traits and specific behavioral tendencies.
IPIP-NEO-300 demonstrates excellent psychometric properties. Domain scales show alpha reliabilities of .90-.95 (vs. .89-.93 for NEO-PI-R), while facet scales average α=.80 (vs. .75 for NEO-PI-R). Convergent validity correlations between IPIP and NEO-PI-R domains range from .84 to .89 (uncorrected), reaching .93-.98 when corrected for unreliability. The instrument has been translated into 40+ languages and used in over 600 peer-reviewed publications. Its public-domain status enables large-scale online research impossible with proprietary measures.
Scientific references
Goldberg, L. R. (1993)
Goldberg, L. R., Johnson, J. A., Eber, H. W., Hogan, R., Ashton, M. C., Cloninger, C. R., & Gough, H. G. (2006)
Costa, P. T., & McCrae, R. R. (1992)
McCrae, R. R., & John, O. P. (1992)
Frequently asked questions
What is the IPIP-NEO-300 Big Five personality test?
IPIP-NEO-300 is a comprehensive, scientifically validated personality assessment measuring the Big Five personality traits (Neuroticism, Extraversion, Openness, Agreeableness, Conscientiousness) and their 30 underlying facets. Developed by Lewis Goldberg at the Oregon Research Institute, it's a free, public-domain alternative to the commercial NEO-PI-R with equivalent or superior psychometric properties.
How accurate and reliable is the IPIP-NEO-300 test?
IPIP-NEO-300 demonstrates excellent reliability with Cronbach's alpha coefficients of .90-.95 for the five domain scales and .77-.88 for the 30 facet scales. Convergent validity correlations with the original NEO-PI-R range from .84 to .89. When corrected for measurement error, these correlations reach .93-.98.
How long does the IPIP-NEO-300 Big Five test take to complete?
The full IPIP-NEO-300 typically takes 40-60 minutes to complete. This comprehensive assessment provides detailed insights across 30 personality facets. The 300-item version provides the most reliable and nuanced personality profile available.
What's the difference between IPIP-NEO-300 and NEO-PI-R?
Both tests measure the same Big Five factors and 30 facets, but IPIP-NEO-300 is free and open-source while NEO-PI-R is a copyrighted commercial product. IPIP uses 10 items per facet (300 total) versus NEO-PI-R's 8 items (240 total). Research shows IPIP-NEO has equal or slightly higher reliability coefficients.
How should I interpret my IPIP-NEO-300 results?
Your results show percentile scores for 5 domains and 30 facets. Scores above 55 indicate higher-than-average traits; below 45 indicates lower-than-average. The facets within each domain reveal specific patterns. No score is 'good' or 'bad'-they describe tendencies useful for self-understanding, career guidance, and relationship insights.
Is the IPIP-NEO-300 scientifically valid for personality assessment?
Yes, IPIP-NEO-300 is one of the most scientifically validated personality assessments available. It has been cited in over 3,500 academic publications, translated into 40+ languages, and used in large-scale research studies worldwide. The Big Five model it measures is considered the gold standard in personality psychology.
Instructions
Describe yourself as you generally are now, not as you wish to be in the future. Describe yourself as you honestly see yourself, in relation to other people you know of the same sex and roughly the same age. Rate each statement on a scale from 1 (Very Inaccurate) to 5 (Very Accurate).
Ready to start?
Over 1500 scientifically validated tests. Completely free and no registration required.