Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Statistics
Normal Distribution Calculator
Convert any raw value to a z-score using a custom mean and standard deviation, then find corresponding normal distribution probabilities. Perfect for standardizing test scores, measurements, or survey results.
Fill in the required fields to see your result.
Statistics
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.
Fill in the required fields to see your result.
Key differences
| Normal Distribution Calculator | Standard Deviation Calculator | |
|---|---|---|
| Category | Statistics | Statistics |
| Inputs required | 3 | 3 |
| Result | Z-Score | Standard Deviation |
| What it does | Convert any raw value to a z-score using a custom mean and standard deviation, then find corresponding normal distribution probabilities. Perfect for standardizing test scores, measurements, or survey results. | 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. |