ztable.io

Z-table lookup: Find the percentage of values below a given z-score in a standard normal distribution.

As of May 2026, ztable.io has 32 users in the Education category.

Usersup 18.5 percent+18.5%
32
32
Ratingno change0%
— reviews
Reviewsno change0%
Version
1.0.0
Manifest V3

History

3 snapshots

Tracking since Apr 1, 2026.

33.483026.52Apr 1, 2026May 31, 2026
View as table
DateUsersRatingReviewsVersion
Apr 1, 2026271.0.0
May 2, 2026281.0.0
May 31, 2026331.0.0
Now321.0.0

Permissions & access

Permissions
None declared
Host access
None declared

Screenshots

ztable.io screenshot 1ztable.io screenshot 2ztable.io screenshot 3ztable.io screenshot 4

About

A tool to quickly calculate probabilities in a normal distribution from a z-score table. 

You can either use the slider or enter a z-score value in the input field to find, among other things, the percentage of values below or above this value in a standard normal distribution.

You can also: 
- Compute probabilities between two z-scores.
- Calculate a z-score by entering a test value, a mean value and a standard deviation.
- Read and understand how to use a positive and negative z-table.

Technical

Version
1.0.0
Manifest
V3
Size
23.73KiB
Min Chrome
95
Languages
1
Featured
No

Metadata

ID
pcngapbnaiajachjlccdjlmikbbnboma
Developer ID
u5dadd5a6db575ece0e57f3d24c28724b
Developer Email
[email protected]
Created
Dec 1, 2021
Last Updated (Store)
Oct 26, 2023
Last Scraped
May 31, 2026
Website
ztable.io
Privacy Policy

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Data sourced from the Chrome Web Store · last verified May 31, 2026.