Standard Deviation Calculator
Calculate mean, variance, and standard deviation for a dataset with population or sample mode.
Values
Comma, space, or semicolon separated numbers
Result
—
Enter values and click Calculate.
Population mode divides by N. Sample mode divides by n−1 (Bessel's correction) for an unbiased estimate.
Add values one by one or paste a list.
Sample when data is a subset of a larger group.
Mean, variance, standard deviation, count, and sum.
Eight test scores using sample standard deviation.
Mean 5, sample std dev ≈ 2.14
Always using n−1
Fix: Use n for a full population.
Confusing variance with std dev
Fix: Std dev is the square root of variance.
Empty dataset
Fix: Enter at least one (population) or two (sample) numbers.
Calculate mean, variance, and standard deviation for a dataset with population or sample mode.
Values
Comma, space, or semicolon separated numbers
Result
—
Enter values and click Calculate.