Z-Score: IQ Score 130, Mean 100, SD 15
An IQ of 130 with mean 100 and SD 15 gives a z-score of 2.0, placing it in the top ~2.3% of the population.
How to use this tool
- Enter data point (x), mean (μ) and standard deviation (σ) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your z-score and the full breakdown beneath it.
Find the z-score for an IQ of 130, a common benchmark for high-range cognitive ability, using the standard IQ distribution.
Frequently asked questions
- What does a z-score mean?
- A z-score of +1 means the value is 1 standard deviation above the mean; −2 means 2 standard deviations below. Z-scores allow comparison across different scales and distributions.