Weighted Average & Percentile Calculator
Compute mean, weighted mean, median, quartiles, percentiles and standard deviation from a list of numbers.
About this tool
A quick descriptive-statistics calculator for analysts, students and data folks. Paste numbers separated by commas, spaces or new lines and instantly get the count, sum, simple and weighted means, min/max, median, Q1/Q3, IQR, P10 and P90 (linear-interpolation method), plus both population and sample standard deviation. Add an optional parallel list of weights to get the weighted mean.
Frequently asked questions
How do I calculate a weighted average?
Put your values in the first box and a matching list of weights in the second box. The weighted mean is Σ(value×weight) / Σ(weight); the counts must line up.
What percentile method does this use?
Percentiles, quartiles and the median use linear interpolation between closest ranks (the NIST / Excel PERCENTILE.INC method).
What is the difference between population and sample standard deviation?
Population standard deviation divides the squared deviations by n; sample standard deviation divides by n-1 (Bessel's correction) and needs at least two values.