Z-Score Calculator

About

Quickly calculate Z-scores for any dataset using this simple, offline Chrome extension. Perfect for students, educators, and data analysts.

The Z-Score Calculator is designed to help you find standardized scores from raw data, mean, and standard deviation, directly from your browser. Whether you're studying statistics, working on a research project, or analyzing test scores, this extension provides a fast and accurate way to compute Z-scores without any internet connection or complex software.

What This Extension Does
This tool lets you input a raw value, the dataset's mean, and standard deviation — and instantly provides the Z-score. It's ideal for quick calculations in academic or professional contexts, all from within your browser.

No signup, no data collection, no external website required.

Key Features
Accurate Z-Score Calculation
Input raw score, mean, and standard deviation to instantly compute the Z-score.

Works Offline
All calculations happen locally in your browser. No internet connection is needed after installation.

Educational Tool
Great for students and teachers working with statistics, normal distribution, or standardization.

Clean Interface
Minimal, distraction-free UI to keep your focus on calculations.

No Ads or Tracking
Privacy-friendly: does not collect data or show advertisements.

Who Is It For?
This extension is made for:

Students studying statistics or preparing for exams

Teachers creating lesson materials or grading based on Z-scores

Researchers performing data normalization or hypothesis testing

Test analysts standardizing results across groups

Anyone working with normal distribution and standard deviation

Example Use Case
Say you scored 82 on a test where the mean score was 75 and the standard deviation was 5. Open the extension, plug in the numbers, and instantly get your Z-score. This helps you understand how your score compares to others in a standardized way.

Privacy-Focused
This extension performs all calculations locally in your browser. It does not collect or transmit any data and does not interact with external websites. Your usage remains entirely private and secure.

How It Works (Technical Simplicity)
The extension uses the Z-score formula:

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Z = (X - μ) / σ
Where:

X is your raw score

μ is the mean

σ is the standard deviation

It does this in real time, instantly showing you the result — no loading or waiting.

What This Extension Does Not Do
To avoid confusion:

This extension does not access external websites.

It does not collect or store user data.

It is not affiliated with any educational institution or analytics company.

It does not replace full-featured statistical software — it's built for quick Z-score calculation only.

Why Install This Extension?
If you work with data or are learning statistics, this extension will save you time. It’s always available in your browser, requires no login, and is much quicker than opening spreadsheets or statistical software for a simple Z-score.

Maintenance and Updates
This extension is lightweight and designed to work without needing regular updates. However, minor UI improvements and additional functionality (e.g., P-value lookup or normal distribution charting) may be added based on feedback.

Support
Have a feature request or feedback? Reach out via the support tab on the Chrome Web Store listing. We aim to keep the extension clear, helpful, and easy to use.

Permissions Explained
No host permissions required.
The extension runs entirely in the browser and does not access external websites.

No storage, no tracking.
We respect user privacy — no personal or analytics data is stored or sent.

Summary
Z-Score Calculator Chrome Extension is a fast, focused tool for computing standardized scores. Whether you're a student, teacher, or researcher, this tool provides exactly what you need for quick statistical analysis, with zero distractions and maximum privacy.