Percentage calculator
Calculate proportions, increases, decreases and changes between values.
MATHMean & statistics
Understand your data: mean, median and spread.
A LITTLE MORE CLARITY
Arithmetic mean
5
Example result · Adjust the inputs to make it yours
Median4.5
Population deviation2
Values8
Minimum2
Maximum9
All the details
8 rows| Index | Value |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 4 |
| 4 | 4 |
| 5 | 5 |
| 6 | 5 |
| 7 | 7 |
| 8 | 9 |
UNDERSTAND THE HOW
More than a result. An explanation.
We calculate mean, median and population standard deviation. Use a decimal point and separate values with semicolons, spaces or newlines.
mean = Σx / n; σ = √(Σ(x − mean)² / n)Assumptions and limitations
Up to 10,000 finite values, between −10¹² and 10¹². Population deviation, not sample deviation.
A simple example
2;4;4;4;5;5;7;9: mean 5 and deviation 2.
Are my inputs stored?
No. Processing stays in your browser. Only tool IDs and timestamps are kept in your recent history; password generation is excluded.
Formula visible · Updated September 8, 2026
Worked example and interpretation
For 2; 4; 4; 4; 5; 5; 7; 9, the sum is 40 across 8 values, so the mean is 5. The two middle sorted values are 4 and 5, giving a median of 4.5. The population standard deviation is 2.
What to check
Outliers can shift the mean substantially. Compare the median and keep units consistent. This standard deviation divides by n; a sample estimate uses n − 1 and differs.