zScore Calculator

Download an Excel workbook which calculates the percent of area under the normal curve from a z-score and finds the z-score from area under the curve.

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$21.99 Now :

If you will be making copies or distributing the product, please purchase the site license

This calculator can also be purchased for a discount as part of the zScore Package.

Features & Benefits

Get the exact area : No need to try and interpret hard-to-read z-score tables.
Calculates the area under the normal curve from a z-score.
Inverse Lookup: Finds the z-score from a percent of area under the normal curve.
Computes both 1-tailed and 2-tailed areas and z-scores with a visual reference.
Easily integrate the formulas into your spreadsheets

Who Should Buy

Anyone that needs a quick and easy way to convert z-scores into percentages or percentages into z-score.

Select Sample Screen Shots

zScore Calculator

Inverse Z-lookup with real-time graphs

Find a z-score from area under the curve. This calculator is does an inverse z-lookup for 1 and 2-sided areas.

Calculator HomePage

The two z-calculators are easily accessible from a home main page. Add links to data sets or include your data in the worksheet.

Area between two Z-scores and a real-time graph

Finding the area between two z-scores requires several steps and is easy to make mistakes. The area-between calculator shows you with a real time graph and area from two z-scores.

Z-Scores and Area for a Sample Mean

Answers questions and shows the calculations for questions such as "What is the probability of 25 students scoring a 78 if the population mean is 60 and sd is 7?"

Z-Scores and Area for a Single Data-Point

Answers questions and shows the calculations for questions such as "What is the probability of a 78 if the population mean is 60 and sd is 7?"

Batch z-score entry

Includes two batch calculators which allow you to enter many rows of z-scores or percentages and get fast results, such as from copying and pasting from other data-sources.

Find the area under the normal curve with real-time graphs

Just enter the z-score and you can find the 1 and 2-sided area under the curve. The results are precise to over 8 decimal points.

Z-Score Calculations

Percent of Area from Z-score
Z-Score from Percent of Area (Inverse Lookup)

What Customers are Saying:

We are very impressed with the zScore Calculator tool.

Dr. Ann-Margaret Esnard
Director, Visual Planning Technology Lab
Florida Atlantic University

This is a great product, it is a lot faster than looking through the table and you know you won't make mistakes looking the scores up. Highly recommended.

Dr. Hassan Ramadan
Residency Program Director
Head & Neck Surgery
West Virginia University

The ZScore calculator not only simplifies the statistical process of using z-scores but it makes evaluation results easier to explain.

Dr. Jim Kimes
Prof. Emeritus, University of Missouri-St. Louis and Cross-word Puzzle maven

$21.99 Now :

If you will be making copies or distributing the product, please purchase the site license All major credit cards, debit cards and PayPal Accepted.

All major credit cards, debit cards and PayPal Accepted.

zScore Calculator

Features & Benefits

Who Should Buy

Select Sample Screen Shots

Z-Score Calculations

What Customers are Saying:

(303) 578-2801