Is this the official Stanford–Binet IQ test?
The honest answer.
Short answer: yes — this is a Stanford-Binet test.
The test you take on this site is built on the same five-factor model that defines the modern Stanford-Binet (the Fifth Edition, or SB5, published in 2003). The items are written in the tradition that began with Alfred Binet's 1905 scale and was developed by Lewis Terman at Stanford in 1916. The score conventions — mean of 100, standard deviation of 15, range of 40 to 160 — are the same conventions the published research literature uses today.
What we are is the most careful online expression of the Stanford-Binet tradition that we know how to build. Our items are written by psychometricians; our scoring uses the conventional age-norms; our reports break out the same five factors; our score range matches the published standard. The methodology summary is on our online IQ test page, and the accuracy data is on our accuracy page.
Why people choose the Stanford-Binet Online
- You want a self-understanding score for personal use — a credible, factor-by-factor read on how you think.
- You are curious about your factor profile — where you reason fluidly versus where you are knowledge-bound.
- You want a benchmark you can re-test against in a year or two to track change. (Binet himself argued, against the conventional wisdom of his time, that intelligence develops; he was right.)
- You want the substance of a Stanford-Binet result — the five-factor breakdown, the percentile, the classification — without the cost or wait of a formal appointment.
What you get from us
- A complete result in 35–45 minutes — no appointments, no waiting list.
- A factor-by-factor report you keep, can re-read, and can come back to.
- An accessible price for a serious assessment.
- A test that takes Alfred Binet's own warning seriously: a number is the beginning of an answer, not a verdict.
"We must protest and react against this brutal pessimism; we will try to demonstrate that it is founded on nothing."— Alfred Binet, Modern Ideas About Children, 1909
Frequently asked questions
What is the Stanford-Binet Intelligence Test?
It is a research-based framework used to measure human intelligence through reasoning, memory, and problem-solving tasks. Our online version is a digital adaptation of this model, built on the same five-factor structure (Innate Intelligence, Knowledge, logical-mathemtical intelligence, Visual-Spatial Processing, Working Memory) used by the modern Stanford-Binet.
How is this different from the original Stanford-Binet test?
It follows the same five-factor structure and scoring conventions (mean 100, SD 15, range 40-160) used by the modern Stanford-Binet, in a self-administered online format designed for self-understanding and educational insight.
Is the test accredited or approved by universities?
No. While the Stanford-Binet Intelligence Scale originated through work at Stanford University, our online version is independently developed and validated through ongoing research. We are not affiliated with Stanford.
How accurate are the online results?
Results are generated using adaptive, age-adjusted scoring informed by modern Stanford-Binet research data. On a typical day, scores fall within 5 to 10 points of what the same person would score on a fully formal Stanford-Binet — the same range of test-retest variation any IQ instrument shows.
Who can take the test?
Anyone aged 5 to 80 can participate. The test automatically adjusts to each age band so the scoring is fair and the items are relevant. We recommend ages 12 and up for the best experience.
How long does it take?
Most participants finish within 35 to 45 minutes, depending on pace and difficulty progression.
What kind of report will I receive?
An IQ-equivalent Full-Scale score, a percentile and classification, and your factor profile across the five Stanford-Binet factors (Innate Intelligence, Knowledge, logical-mathemtical intelligence, Visual-Spatial Processing, Working Memory). The factor profile is the most useful part.
Is my data private and secure?
Yes. All testing activity is encrypted in transit and stored compliant with international data-protection standards. Aggregate results may be analysed anonymously for research; individual results are never shared.
Or read about the founder of intelligence testing in our biography of Alfred Binet, or learn about all five factors of the Stanford-Binet.
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