Z-Score Calculator | Standard Score Calculator Online

A Z-Score Calculator is an online tool used in statistics to determine how many standard deviations a data point is from the mean of a dataset. Z-scores are essential for understanding probabilities, standardization, and comparisons.

This tool is perfect for students, data analysts, and anyone dealing with statistics.

What is a Z-Score?

A Z-Score, also called a standard score, represents how far a value is from the mean, measured in standard deviations.

Formula:$$Z = \frac{X – \mu}{\sigma}$$Z=σX−μ​

Where:

• $X$X = Data point
• $\mu$μ = Mean of dataset
• $\sigma$σ = Standard deviation

Why Use a Z-Score Calculator?

• Quickly standardize data
• Compare different datasets
• Find probability or percentile
• Check outliers in data

How to Calculate Z-Score Manually

1. Subtract the mean from your value
2. Divide the result by the standard deviation
3. The result is your Z-score

Example:

Value (X)	Mean (μ)	SD (σ)	Z-Score
85	75	5	(85-75)/5 = 2
60	75	5	(60-75)/5 = -3

Applications of Z-Scores

Field	Use
Education	Test scores comparison
Finance	Risk measurement
Research	Outlier detection
Quality control	Standardization

Benefits of Using a Z-Score Calculator

• Save time
• Avoid calculation errors
• Mobile-friendly for quick access
• Supports students and professionals

Tips for Accurate Results

• Ensure mean and standard deviation are correct
• Use consistent units
• Enter numeric values only

The Z-Score Calculator is an essential statistical tool. It helps you quickly compute standard scores, analyze datasets, and understand probabilities in an easy, accurate, and mobile-friendly way.