➕ Average Calculator
Find the mean, median, and sum of a list of numbers, or a weighted average.
About this tool
Calculates the mean (average), median, and sum of any list of numbers you paste in, and separately computes a weighted average when different values carry different importance — such as grades worth different credit amounts, or scores from differently-sized groups.
The weighted average uses the standard formula: sum of (value × weight) divided by sum of weights.
Worked example
The numbers 4, 8, 15, 16, 23, 42 average to about 18. A weighted average of 90 (weight 2), 80 (weight 1), and 70 (weight 3) comes out to about 80.
How to use it
- For a simple average, paste or type numbers separated by commas or spaces and press Calculate average.
- For a weighted average, enter one "value, weight" pair per line and press Calculate weighted average.
Tips
- The mean can be pulled significantly by a single extreme outlier — check the median alongside it for a more robust sense of the "typical" value.
- Weighted averages are common for grades (credit hours as weights), surveys (group sizes as weights), or portfolio returns (investment size as weights).
- For a fuller statistical picture — including mode, range, and standard deviation — use the Statistics Calculator instead.
FAQ
What's the difference between this and the Statistics Calculator?
This tool is a fast, focused view of mean, median, and sum, plus a dedicated weighted-average mode; the Statistics Calculator adds mode, range, and standard deviation for a fuller statistical breakdown.
How does a weighted average differ from a simple average?
A simple average treats every number equally; a weighted average lets some values count more than others based on an assigned weight, such as credit hours or group size.
Can I paste numbers from a spreadsheet?
Yes — numbers separated by commas, spaces, or line breaks are all recognized.
From the blog: getting the most out of this tool
Weighted averages show up in more places than people expect once they start looking — course grades, review scores across differently-sized samples, blended interest rates on multiple loans — and the formula is simple but tedious to redo by hand every time the inputs change.
We kept the plain average and the weighted average as two separate panels on the same page rather than merging them, since most visits need only one or the other and a combined interface would just add friction.
📖 Want the fuller explanation?
See GPA Explained for the reasoning behind this calculation, with worked examples.