Average Calculator
Type or paste a list of numbers and get their average (arithmetic mean) instantly, along with the sum, count, minimum, maximum and median. Free and private — nothing leaves your browser.
How to use the average calculator
- Enter your numbers. Type them in or paste a whole column from a spreadsheet — commas, spaces, semicolons and line breaks all work as separators.
- Read the average instantly. The mean is shown big and bold, with the sum, count, min, max, median and range right below, all updating live as you edit.
- Copy the result. Use the copy buttons to grab the worked calculation or the full summary for homework, reports or emails.
About this tool
The average — formally the arithmetic mean — is the sum of all values divided by how many values there are. This free average calculator does that division for you and shows its work, so you can see exactly how the answer was reached: (85 + 92 + 78) ÷ 3 = 85. It is perfect for averaging test scores and grades, golf or bowling scores, monthly expenses, temperatures, response times or any other list of numbers, with full support for negative values, decimals and scientific notation.
All calculations happen locally in your browser as you type — your numbers are never uploaded or stored anywhere, and there are no limits or sign-ups. If you also need variance, standard deviation, mode or quartiles, switch to the full statistics calculator, which accepts the same input format.
Frequently asked questions
How is the average calculated?
Add every number together, then divide by the count of numbers. For example, the average of 4, 8 and 9 is (4 + 8 + 9) ÷ 3 = 21 ÷ 3 = 7. The tool shows this exact calculation under the result so you can follow along or copy it into your work.
What is the difference between average and median?
The average (mean) divides the total by the count, so a single extreme value can pull it up or down. The median is the middle value of the sorted list and is unaffected by outliers. Both are shown here — if they differ a lot, your data probably contains outliers.
Can I use decimals and negative numbers?
Yes. Decimals with a dot (3.5), negative numbers (-12) and scientific notation (2.5e3) are all supported. Note that the comma acts as a separator between numbers, so write one and a half as 1.5, not 1,5.
How many numbers can I average at once?
There is no fixed limit — tens of thousands of values are handled instantly because everything runs locally in your browser. Invalid entries are skipped and reported, so a stray word in a pasted column will not break the result.