Average Calculator
Find the mean, median, mode, minimum, maximum, range, sum and count of a list of numbers, or a weighted average from value and weight rows. Handles negatives, decimals and scientific notation.
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About the Average Calculator
Average Calculator works out the common summary statistics for a list of numbers. Paste or type values separated by commas, spaces or new lines — positive or negative, whole or decimal, or in scientific notation such as 1.5e3 — and it returns the count, sum, arithmetic mean, median, mode or modes, minimum, maximum and range, with a sorted list for shorter inputs.
A weighted-average mode lets you enter value and weight rows when some numbers should count more than others, for example marks with different weightings or prices bought in different quantities. Sums use compensated addition to reduce floating-point error, results are rounded sensibly for display, and long lists of up to 100,000 values are handled without freezing the page. Everything runs in your browser.
How to use
- Choose List of numbers or Weighted average.
- For a list, paste or type your numbers separated by commas, spaces or new lines.
- For a weighted average, enter a value and a weight on each row, adding rows as needed.
- Click Calculate to see the statistics and the method.
- Copy the summary or download it as text or CSV.
Key features
- Count, sum, mean, median, mode(s), minimum, maximum and range.
- Accepts negatives, decimals and scientific notation.
- Weighted average with editable value/weight rows.
- Clear errors for invalid values, missing or negative weights and zero total weight.
- Sorted value list for up to 200 values; up to 100,000 values supported.
- Copy Summary, Download Summary (.txt), Download CSV, Reset and Back.
Best practices
- Use a dot for decimals — commas are treated as separators.
- Check the count matches the number of values you expected.
- Use the median when a few extreme values would distort the mean.
- For weighted averages, make sure all weights use the same unit (for example credits or percentages).
- Keep the CSV if you need the sorted values for further work.
Benefits
- All the key averages in one step.
- Transparent method with the formula shown.
- Handles messy pasted lists quickly.
- Private: your numbers stay in your browser.
Frequently asked questions
What is the difference between mean, median and mode?
The mean is the sum divided by the count. The median is the middle value when the numbers are sorted (or the average of the two middle values for an even count). The mode is the value that appears most often.
What if more than one value appears most often?
All of them are shown as modes. If every value appears exactly once, the calculator says there is no mode.
How is a weighted average calculated?
Weighted average = Σ(value × weight) ÷ Σ(weight). Weights must be zero or more, and the total weight must be above zero.
Can I paste numbers with thousand separators like 1,200?
No — commas separate values, so 1,200 would be read as 1 and 200. Enter 1200 instead, and use a dot for decimals.
How accurate are the results?
Calculations use standard double-precision numbers with compensated summation. Results are displayed to at most 10 decimal places (12 significant digits); extremely large or small values are shown in scientific notation.
Is there a limit on how many numbers I can enter?
Up to 100,000 values. The sorted list is displayed for up to 200 values and is always included in the CSV download.