Z-Score Calculator

Calculate how many standard deviations a value is from the mean.

  • Free Online Tool
  • Instant Results
  • Mobile Friendly
  • No Installation
  • Secure & Private

Understanding This Calculator

Z-Score Formula

Standardizes a value relative to the mean and standard deviation.

z = (x - μ) / σ

  • Positive Z: Above average
  • Negative Z: Below average

Example 1

Score: 85, Mean: 75, SD: 10

  • z = (85 - 75) / 10 = 10 / 10 = 1.0
  • This score is 1 standard deviation above average.

How to Use

  • Enter the value.
  • Enter the mean.
  • Enter the standard deviation.

Frequently Asked Questions

How do I use the Z-Score Calculator?

Enter your values in the input fields, and the result will appear instantly.

Is this calculator free to use?

Yes, this calculator is 100% free and does not require any registration or subscription.

Is it mobile-friendly?

Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.