Average Calculator

An average, commonly called the arithmetic mean, summarizes a group of numbers with one representative value. To calculate it, add every value in the data set and divide the total by the number of values. If the numbers are 8, 10, and 12, their sum is 30 and their count is 3, so the average is 10. This calculator performs those two steps and displays the mean, sum, and count together so you can check the calculation. The arithmetic mean is useful for grades, expenses, measurements, survey responses, sports statistics, and many other everyday comparisons. It takes every entered value into account, including repeated numbers, negative values, and decimals. A repeated value is a separate observation and must be entered each time it occurs. Zero is also a valid value and affects both the sum and the count. An average can be a decimal even when every input is a whole number. It also does not have to equal one of the values in the list. For example, the average of 2 and 3 is 2.5. The mean always lies between the smallest and largest values when the list contains ordinary finite real numbers. However, unusually high or low values can pull it toward an extreme. For skewed data, the median may sometimes describe the center more effectively. You can paste a list separated by commas, spaces, semicolons, or line breaks. The calculator reads each token as one number, adds the values, counts them, and divides the sum by the count. Showing all three results is useful when checking copied data because an unexpected count often reveals a missing or extra entry. Use the output as a fast arithmetic check, then consider the context and distribution of the data before treating the mean as a complete summary. Retain the original data when precision or auditing matters.