Z-Score Calculator
StatisticsCalculate the z-score (standard score) for a value given the mean and standard deviation of a dataset.
Z-Score
How many standard deviations the value is from the mean.
Approx. Percentile
84.3
Approximate percentile rank under a normal distribution.
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Odeh Ahwal0people find this calculator helpful
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Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Statistics calculators
Frequently Asked Questions
What does a z-score mean?
A z-score tells you how many standard deviations a value is from the mean. A z-score of 0 means the value equals the mean; positive means above average, negative means below average.
What is a good z-score?
It depends on context. In most fields, a z-score between -2 and 2 is considered typical. Scores beyond ±3 are often treated as outliers.
How is the percentile estimated?
The percentile is approximated from the z-score using a standard normal distribution formula. For precise statistical work, refer to a z-table for exact percentile values.
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