Last Updated: April 13, 2026
Statistics Calculator
Free statistics calculator. Calculate mean, median, mode, range, variance, and standard deviation from a data set.
π How We Calculate — Learn about our calculation methodology, data sources, and quality standards.
Frequently Asked Questions
Mean vs Median?
Mean = average. Median = middle value. Median is better for skewed data (e.g., income) because outliers don't affect it.
What is standard deviation?
SD measures spread around the mean. ~68% of data falls within 1 SD, ~95% within 2 SDs (normal distribution).
Population vs Sample SD?
Population (Ο) divides by N. Sample (s) divides by N-1. Use sample SD when data is a subset of a larger population.