Average (Mean) Calculator
Find the mean, median, sum and count of a list of numbers.
Results update as you type.
About this calculator
An average calculator takes a list of numbers and returns the mean (the total divided by how many there are), along with the median, mode, sum, count, range, standard deviation and variance. The mean adds every value and divides by the count; the median is the middle value once the numbers are sorted; the mode is the value that appears most often. Enter numbers separated by commas or spaces.
For example, the list 10, 20, 30, 40, 50 has a sum of 150 and a count of 5, so the mean is 150 ÷ 5 = 30. The median is also 30 (the middle value), the range is 10 to 50, and the standard deviation — a measure of how spread out the numbers are — is about 14.1.
Use it to average test scores, prices, measurements, survey results or any set of figures, and to see at a glance how tightly they cluster. Because it also gives the median and mode, it is handy when outliers would distort a plain average.
Frequently asked questions
What is the difference between mean and median?
The mean is the sum divided by the count. The median is the middle value when the numbers are sorted. The median is less affected by very large or small outliers.
How do I enter the numbers?
Type them separated by commas or spaces, for example "10, 20, 30". Decimals and negative numbers are fine.
What is the mode?
The mode is the value that appears most frequently in the list. A set can have more than one mode, or none if every value is unique — in which case the calculator reports that there is no mode.
What is standard deviation?
Standard deviation measures how spread out the numbers are around the mean. A small value means the numbers cluster tightly; a large one means they are widely scattered. It is the square root of the variance, which the calculator also shows.
How do I find the median of an even set of numbers?
Sort them and take the two middle values, then average them. For 10, 20, 30, 40 the middle two are 20 and 30, so the median is 25. The calculator does this automatically.
Should I use the mean or the median?
Use the mean for evenly spread data. Use the median when a few very large or small outliers would drag the mean away from what is typical — for example house prices or incomes, where the median is more representative.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/average/curl
curl "https://calculator.free/api/v1/average/?numbers=10, 20, 30, 40, 50"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/average/?" + new URLSearchParams({
"numbers": "10, 20, 30, 40, 50"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.