Average Calculator computes the arithmetic mean of a set of numbers — the most widely used measure of central tendency in statistics, data analysis, and everyday math. Enter any list of numbers separated by commas or spaces and get the mean, count, and sum instantly. Useful for calculating GPA, finding the mean of a dataset before entering it into a spreadsheet formula, averaging sensor or API response time readings, or verifying a grade calculation.
The arithmetic mean is calculated by summing all values and dividing by the count: mean = (x₁ + x₂ + ... + xₙ) ÷ n. For example, the average of 15, 22, 8, and 31 is (15 + 22 + 8 + 31) ÷ 4 = 76 ÷ 4 = 19. The result is always between the minimum and maximum values in the set.
Add all values together and divide by how many values there are: mean = sum ÷ count. For example, the average of 10, 20, and 30 is (10 + 20 + 30) ÷ 3 = 60 ÷ 3 = 20. This is the arithmetic mean — the most common type of average.
Mean is the arithmetic average (sum divided by count). Median is the middle value when the numbers are sorted — it is less affected by extreme outliers. Mode is the most frequently occurring value. For a dataset like [1, 2, 3, 100], the mean is 26.5 (pulled up by 100) while the median is 2.5, which better represents the "typical" value when one number is much larger than the rest.
Use the median when the data contains extreme outliers that would distort the mean. For example, when averaging household incomes in a neighborhood where one household earns $10 million and others earn $60,000, the mean gives a misleading picture. The median represents the typical household more accurately. The mean is fine when data is roughly normally distributed without extreme outliers.
Yes. Negative values are included in the sum normally. For example, the average of −5, −3, 0, 4, 9 is (−5 + −3 + 0 + 4 + 9) ÷ 5 = 5 ÷ 5 = 1. The result can be negative if the negative values outweigh the positives.
Yes. Enter decimals using a period as the separator (e.g., 3.14, 2.718, 99.5). The calculator handles floating-point numbers and returns the mean to several decimal places.
Yes, in everyday usage "average" and "arithmetic mean" refer to the same thing: sum divided by count. There are other types of means — geometric mean (used for growth rates and ratios) and harmonic mean (used for speeds and rates) — but when someone says "average" without qualification, they almost always mean the arithmetic mean, which is what this calculator computes.
Tool workspace
Free average calculator online — find the arithmetic mean of any list of numbers instantly. Shows the sum and count. Handles decimals and negatives. No login.
Input
10, 20, 30
Output
20
