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Z-Score Calculator
Calculate z-scores and probabilities
How It Works
A z-score is a statistical measure that describes a value's relationship to the mean of a group of values. It measures how many standard deviations a data point is from the mean.
A z-score, also known as a standard score, indicates how many standard deviations a data point is from the mean. A positive z-score means the data point is above the mean, while a negative z-score means it is below the mean. Z-scores are useful for comparing data points from different distributions and for calculating probabilities using the standard normal distribution.
The standard normal distribution has a mean of 0 and a standard deviation of 1. By converting raw scores to z-scores, we can determine the probability of a value occurring within a normal distribution using z-tables or approximation functions.
Results
Enter values to see results
Quick Tips
- • Results update automatically as you type
- • Use Tab to navigate between fields
- • Press Enter to calculate