Z-Score Table

Look up standard normal probabilities for any z-score, or find the z-score for a probability.

LiveStatisticsURL: /z-table

Enter your values

Report error

Did we solve your problem today?

How to use this calculator

Enter your values after choosing the type of calculation in the tabs. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.

How to read the results

The standard normal distribution has mean 0 and standard deviation 1. P(Z < z) is the area to the left of z, the value printed in most z-tables. Example: P(Z < 1.96) ≈ 0.97500, so 95% of values lie between −1.96 and 1.96.

zP(Z < z)
-30.0013
-2.50.0062
-20.0228
-1.6450.0500
-10.1587
00.5000
10.8413
1.6450.9500
1.960.9750
20.9772
2.3260.9900
2.5760.9950
30.9987

Values are computed with a standard numerical approximation accurate to about 7 decimal places.

Frequently asked questions

What z-score is the 95th percentile?

About 1.645.

How do I convert a value to a z-score?

z = (x − mean) ÷ standard deviation.

About this tool

Written by
[Author: to be assigned]
Reviewed by
Formula tests passed · human review pending
Last updated
31 Oct 2026

See our methodology and editorial policy. Think something’s off? Report an error with this tool.

Related tools

All Math & Statistics
Live

Statistics Calculator

Get the mean, median, mode, standard deviation, variance, quartiles and range of a data set in one go.

Statistics
Live

T-Distribution Table

Find critical t-values for any degrees of freedom and significance level, one- or two-tailed.

Statistics
Live

Probability Calculator

Combine the probabilities of two independent events, or find the chance something happens at least once over repeated tries.

Statistics
Live

Variance Calculator

Find the sample or population variance of a list of numbers, with the mean and sum of squares.

Statistics