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Z-Score Calculator

Calculate a z-score from an entered deviation.

Percentage Change Z-score

Inputs

ValueMeanStandard deviation

Result

Formula

z = (value − mean) ÷ standard deviation.

Calculation

Data & privacy

Client-side computation

Your numbers are calculated in this browser.

Example

Example: value 85, mean 70, and deviation 10 is 1.5. The calculator does not estimate the deviation from raw data.

Use a decimal point (.) and up to six decimal places; do not enter commas, currency symbols, or exponents. Amounts use the same unit.

Results show up to six decimal places. Nonzero values that round to zero are shown as a range and cannot be copied as a number.

Limits

The value and mean are -1,000,000,000,000 to 1,000,000,000,000. The standard deviation must be greater than 0. No normal-distribution probability is shown.

Select the result to copy it manually.

Values below display precision cannot be copied.

Your numbers are calculated in this browser.

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