Z-Score Calculator
Z-score and approximate percentile from mean and standard deviation you enter.
Limitation: Educational statistics.
How to Use the Z-Score Calculator
Z-score and approximate percentile from mean and standard deviation you enter.
Open the Z-Score calculator and read field labels.
Match the mode
Educational statistics.
What It Calculates
Z-score and approximate percentile from mean and standard deviation you enter.
Worked Examples
One SD above mean
Inputs
Result
≈84th percentile.
At the mean
Inputs
Result
50th percentile approx.
Below mean
Inputs
Result
≈16th percentile.
Check your mode
Educational statistics.
Frequently Asked Questions
Still have questions about this calculation?
Try the CalculatorFormulas
Standard definitions with assumptions noted below.
Formula
Scientific Background
Standard statistics definitions with assumptions stated on-page. Educational only—not professional certification.
Sources & review
Z-Score Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
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