Z-Score Calculator

Find how many standard deviations a value is from the mean.

Z-score 1.5

Formula: z = (x − μ) ÷ σ

Step-by-step with your numbers:

1. Values used:

2. Value (x) = 85

3. Mean (μ) = 70

4. Standard deviation (σ) = 10

6. Z-score = 1.5

Did we solve your problem today?

A z-score tells you how unusual a value is within its distribution.

The math behind it

z = (value − mean) ÷ standard deviation. z = 2 means two standard deviations above the mean.

x 85, μ 70, σ 10 → z = 1.5.

Negative z?

The value is below the mean.