Math Calculators

Z-Score Calculator

Calculate z-score from value, mean, and standard deviation.

Value (x)

Mean (μ)

Standard Deviation (σ)

Z-Score Formula

z = (x − μ) / σ

If x=85, mean=70, sd=10, z = (85−70)/10 = 1.5.

What does z-score mean?

Calculate standard deviation, variance, and mean for a data set. Enter comma-separated values for statistical analysis.

Calculate confidence interval for a population mean using z critical values.

Calculate the probability of events. Find single event probability and combined event probabilities.