All toolsAverage Calculator
Average Calculator
Paste any list of numbers. Every kind of average, instantly.
How it works
Paste numbers in any format (commas, spaces, line breaks, even a column copied straight out of a spreadsheet), and every statistic recalculates as you type. The mean is the sum divided by the count; the median is the middle value once the numbers are sorted; the mode is the most frequent value; and the standard deviation measures how spread out the numbers are around the mean. All of it is computed locally, on your device.
FAQ
Which average should I use: mean or median?
Use the mean when the numbers are fairly balanced, and the median when there are outliers. A street where nine houses are worth £200,000 and one mansion is worth £5 million has a mean of £680,000: technically true, uselessly misleading. The median (£200,000) describes the street honestly. Income, house prices and response times are classic median territory.
Why is the mode sometimes “none”?
The mode is the value that appears most often. If every number appears exactly once, nothing is “most frequent”, so there is no mode. If two values tie for the lead, both are shown.
How does the weighted average work?
Switch to weighted mode and give each value a weight: the tool computes Σ(value × weight) ÷ Σ(weights). Classic uses: a course grade where coursework counts 30% and the exam 70%, or portfolio returns where you hold different amounts of each asset.
Is the standard deviation sample or population?
This tool uses the sample formula (dividing by n−1, Bessel’s correction), which is what spreadsheets like Excel’s STDEV and most statistics courses expect when your numbers are a sample of a larger set. For the population formula (dividing by n), the value will be very slightly smaller.