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Summary

The z-score is calculated by subtracting the population mean from the raw score, and then dividing the difference by the population standard deviation.
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The formula for calculating a z-score is z = (x-μ) / σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation.
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If the population standard deviation or the sample size is below 6, a t-score should be used instead of a z-score.
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According to

An easy to use z score calculator. ... This simple calculator allows you to calculate a standardized z -score for any raw value of X. Just enter your raw ...

Z Score Calculator
socscistatistics.com

Summary
The formula for calculating a z-score is
z = (x-μ) / σ,
where μ is the population mean and σ is the population standard deviation.
Note : if you don’t know the population standard deviation or the sample size is below 6, you should use a t-score instead of a z-score

Z-Score: Definition, Formula and Calculation - Statistics How To
statisticshowto.com

Summary
The formula for calculating a z-score is is z = (x-μ)/σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation.
As the formula shows, the z-score is simply the raw score minus the population mean, divided by the population standard deviation.

Z-Score: Definition, Calculation & Interpretation - Simply Psychology
simplypsychology.org

Summary
The z-score can be calculated by subtracting the population mean from the raw score, or data point in question (a test score, height, age, etc.), then dividing the difference by the population standard deviation:
where x is the raw score, μ is the population mean, and σ is the population standard deviation

Z-score Calculator
calculator.net

The z-score calculator can help you determine the standard score for a data point. ... You can use our z-score calculator to determine this value for you. Read ...

Z-score Calculator
omnicalculator.com

Z-score calculator computes a standardized z-score for any raw data point x. Enter ... You can calculate a z-score for any raw data value on a normal ...

Z Score Calculator
calculatorsoup.com

as a number of standard deviations σ The larger the value of z , the less probable the experimental result is due to chance. The probability can be calculated ...

z score Calculator
fourmilab.ch