Enter numbers separated by spaces, commas, or new lines. The calculator instantly computes the arithmetic mean, total sum, number count, and how many invalid entries were ignored.
The Average Calculator computes the arithmetic mean of a list of numbers — one of the most fundamental statistical measures in math, science, finance, and everyday life. Simply enter your numbers and instantly get the mean, total, count, and number of ignored inputs. To add up the full total without averaging, try the Sum Calculator; to measure how values changed over time, use the Percentage Change Calculator.
Average (Mean) = Sum of All Values ÷ Count of Values
Find the average of 10, 20, 40, and 80:
Step 1 — Add: 10 + 20 + 40 + 80 = 150 Step 2 — Count: 4 numbers Step 3 — Divide: 150 ÷ 4 = 37.5
The arithmetic mean works best with symmetric, evenly distributed data. It can be misleading when your dataset contains outliers — extreme values that pull the average far from the typical value. For example, if nine employees earn $40,000 and one earns $400,000, the average salary is $76,000 — far higher than what most employees actually make.
In these cases, the median (middle value when sorted) is often a more representative measure.
A weighted average assigns different importance (weight) to each value. For example, if a final exam counts 60% of your grade and a quiz counts 40%, the exam carries more influence. The standard arithmetic mean treats all values equally — use a weighted average when some inputs matter more than others.
Add all the numbers together, then divide by the count. For example, the average of 10, 20, and 30 is (10 + 20 + 30) ÷ 3 = 20.
Mean is the arithmetic average (sum ÷ count). Median is the middle value when all numbers are sorted. Mode is the value that appears most often. All three are measures of central tendency but describe a dataset differently.
The mean can be distorted by outliers — extremely high or low values. For example, in income data where a few people earn very high salaries, the median gives a more representative picture of typical earnings. If your data is skewed, consider using the median instead.
A weighted average assigns different importance to each value. For example, if a final exam counts 60% of your grade and a quiz counts 40%, the exam score carries more weight. The standard arithmetic mean treats all values equally.
Yes. Negative numbers are fully supported. For example, the average of -10, 0, and 20 is (-10 + 0 + 20) ÷ 3 = 3.33.
Yes. You can paste numbers separated by commas, spaces, or line breaks — the calculator handles all formats automatically.
Non-numeric inputs are automatically ignored and reported in the 'Ignored' count, so they won't affect your result.
The average of an empty set is undefined — you cannot divide by zero. The calculator will display 0 when no valid numbers are entered.