Z-Score Calculator
Convert a raw score to a z-score and find the corresponding percentile for a normal distribution.
Z-score
z = (x โ ฮผ) / ฯ. The percentile uses the standard normal CDF (Abramowitz & Stegun erf approximation).
Frequently Asked Questions
Is the Z-Score Calculator free to use?
Yes, the Z-Score Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.
Is my data safe when using the Z-Score Calculator?
Absolutely. All calculations performed by the Z-Score Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.
How accurate is the Z-Score Calculator?
Our Z-Score Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.
Can I use the Z-Score Calculator on my mobile phone?
Yes! The Z-Score Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.