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%
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— reviews
Reviewsno change0%
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Version
1.0.0
Manifest V3
History
3 snapshotsTracking since Apr 1, 2026.
View as table
| Date | Users | Rating | Reviews | Version |
|---|---|---|---|---|
| Apr 1, 2026 | 27 | — | — | 1.0.0 |
| May 2, 2026 | 28 | — | — | 1.0.0 |
| May 31, 2026 | 33 | — | — | 1.0.0 |
| Now | 32 | — | — | 1.0.0 |
Permissions & access
- Permissions
- None declared
- Host access
- None declared
Screenshots
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
- Support URL
- https://ztable.io/#examples
- Privacy Policy
- —
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Data sourced from the Chrome Web Store · last verified May 31, 2026.