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Z-Score & Percentile Calculator
Standard score to percentile.
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About Z-Score & Percentile Calculator
Convert between raw score, z-score, and percentile with mean and SD.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Z Score Percentile on Wikipedia. More: all calculators.
Frequently Asked Questions about Z-Score & Percentile Calculator
How do I use the Z-Score & Percentile Calculator?
Open the Z-Score & Percentile Calculator and use the controls in the workspace below: standard score to percentile. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Z-Score & Percentile Calculator free?
Yes. The Z-Score & Percentile Calculator is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Z-Score & Percentile Calculator store or share my data?
No. The Z-Score & Percentile Calculator runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Z-Score & Percentile Calculator for?
Convert between raw score, z-score, and percentile with mean and SD. You will find it grouped under Calculators together with 116 other free tools on the PrimeFreeTools homepage.
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