Is Z-Score Calculator free to use?

Yes, Z-Score Calculator is completely free. No account, no sign-up, and no hidden fees required.

Is my data safe when using Z-Score Calculator?

Your data never leaves your device. All processing happens locally in your browser — nothing is uploaded to any server.

Calculators

Convert a raw score to a z-score with normal-distribution probabilities for left, right, and two-tailed tests

Trusted by 10k+ developers

Raw score (x)

Mean (μ)

Std. deviation (σ)

z-score

1.5000

P(Z < 1.50)

93.3193%

P(Z > 1.50)

6.6807%

Two-tail p-value

13.3614%

Normal CDF computed via Abramowitz & Stegun 26.2.17 (error < 7.5×10⁻⁸).

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