Average Calculator
Calculate mean, median, mode and range from a list of numbers.
This tool runs entirely in your browser. Your files are never uploaded to a server.
6
Count
108
Sum
18
Mean
15.5
Median
-
Mode
4 – 42
Range
What this calculator does
Parses a list of numbers you paste and calculates count, sum, mean, median, mode, and range — the core descriptive statistics for a data set.
How to use it
Paste or type numbers separated by commas, spaces, or line breaks, in any combination. Results update immediately as you edit the list.
Worked example
With the default list 4, 8, 15, 16, 23, 42, count = 6, sum = 108, mean = 108 ÷ 6 = 18, median = (15 + 16) ÷ 2 = 15.5 (the average of the two middle values in the sorted list), mode = "-" since no value repeats, and range = 4 to 42.
Formulas
Mean = sum ÷ count. Median = the middle value of the sorted list, or the average of the two middle values when the count is even. Mode = the value or values that occur most often; if every value appears exactly once, there is no mode. Range = the minimum and maximum values in the list.
Mean vs. median
The mean is sensitive to outliers — a single very large or very small number can pull it noticeably away from where most of the data sits. The median isn't affected the same way, since it only depends on which value sits in the middle once everything is sorted. When a data set has extreme outliers, the median often gives a more representative "typical" value than the mean.
Limitations
Non-numeric entries are silently dropped rather than flagged as errors, so a typo can change your result without warning — double-check the count matches how many numbers you intended to enter. This calculates basic descriptive statistics only; it doesn't compute standard deviation, variance, or other measures of spread.
Scope, sources and privacy
Mean, median, mode and range are standard descriptive statistics defined the same way in statistics education and practice worldwide. Calculations run locally in your browser; the numbers you enter are never uploaded.
Frequently Asked Questions
- What's the difference between mean and median?
- Mean is the sum divided by the count; median is the middle value when the numbers are sorted — median is less affected by outliers.
- What if there's no repeated value?
- If no value repeats, mode shows as '-' since there isn't a most-frequent value.
- How should I separate the numbers?
- Use commas, spaces or new lines — any combination works.