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Statistics
Normal Distribution Calculator
Find the cumulative probability P(X ≤ x) for a normal distribution given any mean, standard deviation, and x value. Useful for statistics students, researchers, and engineers working with continuous random variables.
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 | 4 | 3 |
| Result | Probability | Standard Deviation |
| What it does | Find the cumulative probability P(X ≤ x) for a normal distribution given any mean, standard deviation, and x value. Useful for statistics students, researchers, and engineers working with continuous random variables. | 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. |