Statistics Calculator
Calculate mean, median, mode, standard deviation, variance, quartiles, and more from a list of numbers. Paste data and get full descriptive statistics instantly.
Frequently asked
questions
Population std dev (σ) uses N in the denominator — used when you have data for the entire population. Sample std dev (s) uses N-1 (Bessel's correction) — used when your data is a sample from a larger population. Use sample std dev for most real-world analysis.
The IQR is Q3 − Q1, representing the middle 50% of the data. It's a robust measure of spread that ignores outliers. Data points below Q1 − 1.5×IQR or above Q3 + 1.5×IQR are considered potential outliers.
A dataset can be unimodal (one mode), bimodal (two modes), or multimodal (multiple modes). If no value appears more than once, the dataset has no mode.