If you're weighing Stanford-Binet Intelligence Scales against Wechsler Adult Intelligence Scale, the short answer is that they serve overlapping but distinct purposes. This page breaks down exactly how each test is built, who it's for, and when to pick one over the other.
Side-by-side comparison
| Stanford-Binet | WAIS | |
|---|---|---|
| Full name | Stanford-Binet Intelligence Scales | Wechsler Adult Intelligence Scale |
| Year introduced | 1916 (current: SB5, 2003) | 1955 (current: WAIS-IV / WAIS-5, 2008+) |
| Target audience | Ages 2 to 85+ | Adults aged 16–90 |
| Duration | 45–90 minutes | 60–90 minutes |
| Format | Administered one-on-one by a trained psychologist | Administered one-on-one by a trained psychologist |
| Scoring | Mean 100, SD 15; full-scale IQ + 5 factor scores | Mean 100, SD 15; composite + four index scores |
| Strengths | Widest age range of any IQ test; strong at both extremes of the distribution (very low and very high) | Clinical gold standard for adult cognitive assessment; excellent reliability and construct validity |
| Weaknesses | Less widely used in adults than WAIS; proprietary | Requires professional administration; not available as a free online test |
| Best for | Identifying giftedness in children, full-range cognitive assessment across the lifespan | Diagnostic evaluation, neuropsychological assessment, clinical settings |
Stanford-Binet in depth
Stanford-Binet Intelligence Scales — Widest age range of any IQ test; strong at both extremes of the distribution (very low and very high). It's typically used for identifying giftedness in children, full-range cognitive assessment across the lifespan. Less widely used in adults than WAIS; proprietary.
WAIS in depth
Wechsler Adult Intelligence Scale — Clinical gold standard for adult cognitive assessment; excellent reliability and construct validity. It's typically used for diagnostic evaluation, neuropsychological assessment, clinical settings. Requires professional administration; not available as a free online test.
Which should you take?
For most people, Stanford-Binet is the stronger choice when identifying giftedness in children, while WAIS is better suited when diagnostic evaluation. If you want an instant starting point before committing to a formal test, our free IQ test gives you a calibrated baseline in under 20 minutes.
Want to find out your IQ score?
Take our free, scientifically validated test and get detailed results in 20 minutes.
Take the Free IQ TestTake these tests directly
- Full Stanford-Binet test — take a Stanford-Binet-style test.
- Full WAIS-style test — take a WAIS-style test.
- Free general IQ test — fast online baseline.
Other comparisons
- Free online IQ test vs WAIS
- MoCA vs MMSE
- Raven vs WAIS
- Raven vs Cattell
- CHC vs Wechsler
- Cattell vs Stanford-Binet
Understand IQ scores in depth
- What IQ 100 means — the population average.
- What IQ 115 means — one standard deviation above.
- What IQ 130 means — the gifted/Mensa threshold.
- What IQ 145 means — highly gifted range.
- What is a good IQ score?
- IQ test types compared
Frequently asked questions
What's the difference between Stanford-Binet and WAIS?
Stanford-Binet (Stanford-Binet Intelligence Scales) is best for identifying giftedness in children, full-range cognitive assessment across the lifespan, while WAIS (Wechsler Adult Intelligence Scale) is best for diagnostic evaluation, neuropsychological assessment, clinical settings.
Which is more accurate, Stanford-Binet or WAIS?
Both are well-validated. Stanford-Binet: Widest age range of any IQ test; strong at both extremes of the distribution (very low and very high). WAIS: Clinical gold standard for adult cognitive assessment; excellent reliability and construct validity. Accuracy depends on what you need to measure.
How long does each test take?
Stanford-Binet takes 45–90 minutes. WAIS takes 60–90 minutes.