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This calculator can also be purchased for a discount as part of the zScore Package.
Inverse Z-lookup with real-time graphs
Find a z-score from area under the curve. This calculator does an inverse z-lookup for 1 and 2-sided areas.
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.