Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Average Calculator
Calculate the arithmetic mean (commonly just called "the average") of up to five numbers — the simplest and most widely used measure of central tendency. Enter two to five values and the calculator returns their sum divided by the count of numbers entered. Missing or blank fields are excluded, so you can average just two or three values without having to fill all five. Useful for quickly averaging test scores, monthly expenses, sensor readings, or any small set of numbers where you want a single summary value that represents the group.
Standard Deviation Calculator
Compute the sample standard deviation directly from three summary statistics — sample size n, the sum of values Σx, and the sum of squared values Σx². This is the spread metric used in virtually every empirical study, quality-control chart, and risk model.
Key differences
| Average Calculator | Standard Deviation Calculator | |
|---|---|---|
| Category | Math | Statistics |
| Inputs required | 5 | 3 |
| Result | Average (Mean) | Standard Deviation |
| What it does | Calculate the arithmetic mean (commonly just called "the average") of up to five numbers — the simplest and most widely used measure of central tendency. Enter two to five values and the calculator returns their sum divided by the count of numbers entered. Missing or blank fields are excluded, so you can average just two or three values without having to fill all five. Useful for quickly averaging test scores, monthly expenses, sensor readings, or any small set of numbers where you want a single summary value that represents the group. | Compute the sample standard deviation directly from three summary statistics — sample size n, the sum of values Σx, and the sum of squared values Σx². This is the spread metric used in virtually every empirical study, quality-control chart, and risk model. |