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Z-score Calculator

Z-score: Standardized score with a normal-distribution percentile estimate..

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Z-score Calculator for United States

US · 12,345.67US customary measurementsRoad distance: miles

United States display and unit preferences. The stated calculation method is used. Review the labeled units before entering your values.

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Your details

Results update instantly as you change the inputs.

Z-score

0.667

United States · calculated from your inputs

Normal percentile74.75%
Your calculation, beautifully packaged.Download a report with this result, your inputs, the formula, and assumptions.

How this result was calculated

  1. z=(x−mean)/standard deviation.
  2. Country setup: United States. Displayed measurements are converted to the formula's base units internally.

Assumption: Standardized score with a normal-distribution percentile estimate. United States display and unit preferences. The stated calculation method is used. Review the labeled units before entering your values.

Calculation version 1.0.0 · Support state: generic

Formula and method

z=(x−mean)/standard deviation.

This calculation uses the values you enter. It runs in your browser and does not request a location or account.

Worked example

A value 130 with mean 100 and standard deviation 15 has z=2.

Questions people ask

Which method does this tool use?

z=(x−mean)/standard deviation.

What should I check before using the result?

Standardized score with a normal-distribution percentile estimate.