Average Calculator

Paste any list of numbers and instantly get the mean, median, mode, range, sum, and standard deviation — all calculated in your browser.

Enter your numbers

Separate numbers with commas, spaces, or new lines. Decimals and negatives are fine.

Enter at least one number above to see the average and full statistics.

Everything is calculated instantly in your browser — your numbers never leave your device.

Frequently Asked Questions

What does this average calculator calculate?

It computes the full picture for your set of numbers: count, sum, mean (average), median, mode(s), range, minimum, maximum, plus both population and sample standard deviation and variance.

How do I enter the numbers?

Type or paste your numbers into the box separated by commas, spaces, or new lines. Decimals and negative numbers are supported, and blank entries are ignored.

Does it do standard deviation?

Yes. It shows both the population standard deviation (divide by N) and the sample standard deviation (divide by N−1), along with the matching variances.

Understanding the Average Calculator

The Average Calculator turns any list of numbers into a complete statistical summary in one step. Paste or type your values — separated by commas, spaces, or new lines — and it instantly returns the count, sum, mean (average), median, and mode, along with the range, minimum, and maximum. For anyone who needs more than a simple average, it also reports both population and sample standard deviation and variance. Everything runs entirely in your browser, so your data stays on your device, and results update live as you edit. Decimals and negative numbers are fully supported, and non-numeric junk is skipped gracefully.

How it works

Enter your numbers in the box; the tool splits the text on commas, spaces, and line breaks, ignores blanks, and reads each token as a number. It sums the values and divides by the count to get the mean, sorts them to find the median (the middle value, or the average of the two middle values for an even count), and tallies frequencies to find the mode(s). Range is max minus min. For spread, it sums the squared differences from the mean, then divides by N for the population variance or by N−1 for the sample variance; the square roots give the two standard deviations. Results recompute live as you type.

mean = (Σxᵢ) / n; median = middle value of sorted data (mean of the two middle values if n is even); range = max − min; population variance σ² = Σ(xᵢ − mean)² / n, population SD = √σ²; sample variance s² = Σ(xᵢ − mean)² / (n − 1), sample SD = √s².

Worked example

Enter 12, 7, 9, 14, 7, 21, 18, 7, 10. The calculator shows count 9, sum 105, mean ≈ 11.67, and median 10. The value 7 appears three times, so the mode is 7. The range is 14 (21 − 7), with a minimum of 7 and a maximum of 21. The population standard deviation is about 4.81 and the sample standard deviation is about 5.10.

Tips & common mistakes

Use the sample standard deviation when your numbers are a sample drawn from a larger group; use the population version only when you have every member of the group.
You can paste a whole column copied from a spreadsheet — line breaks are treated as separators automatically.
If a value won't parse, it's skipped and flagged in an amber notice, so a stray letter or symbol won't break the result.
The mean is sensitive to outliers; compare it with the median to spot skew in your data.
A 'No mode' result simply means every value is unique — that's normal for many data sets.
Use Copy as CSV or Download CSV to drop the full summary straight into a spreadsheet or report.