Z score calculator
Click to upload or drag and drop
Accepts csv, parquet, tsv and json
Trusted by over 30,000 users every month
Calculate z-scores online with ease
Transform your data into standardized z-scores to understand how far each value deviates from the mean. Perfect for comparing values from different distributions, identifying outliers, and understanding data distribution.
Analyze csv, parquet, tsv and json in seconds
Calculate z-scores using sample or custom parameters
Visualize z-score distribution
Identify outliers and extreme values
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Get instant insights about your data's standardized values
How to calculate z-scores online
- Upload your data
Use the input box at the top of the page to upload your dataset - Select a column
Choose the numerical column you want to analyze - Optional: Customize parameters
Optionally enter custom mean and standard deviation values - View z-scores
See the calculated z-scores and their distribution - Interpret results
Use the interpretation guide to understand what the z-scores mean
Example distributions and their z-scores
Normal Distribution Z-Scores
A normal distribution's z-scores follow a standard normal distribution with mean 0 and standard deviation 1.
Sample Statistics:
- Original mean: 9.99
- Original standard deviation: 0.99
- Z-scores mean: -0.00
- Z-scores standard deviation: 1.00
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