Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Statistics
Standard Deviation Calculator
Instantly find the standard deviation and variance of any numeric data set, choosing between population or sample formulas. Ideal for students, researchers, and analysts summarizing data spread.
Fill in the required fields to see your result.
Statistics
Confidence Interval Calculator
Compute the lower and upper bounds of a confidence interval for a population mean using a sample mean, the standard error of that mean, and a critical z-value (1.645 / 1.96 / 2.576 for 90% / 95% / 99% confidence). This is the standard way to report uncertainty around survey results, lab measurements, or any sample-based estimate.
Fill in the required fields to see your result.
Key differences
| Standard Deviation Calculator | Confidence Interval Calculator | |
|---|---|---|
| Category | Statistics | Statistics |
| Inputs required | 3 | 3 |
| Result | Standard Deviation | Lower Bound |
| What it does | Instantly find the standard deviation and variance of any numeric data set, choosing between population or sample formulas. Ideal for students, researchers, and analysts summarizing data spread. | Compute the lower and upper bounds of a confidence interval for a population mean using a sample mean, the standard error of that mean, and a critical z-value (1.645 / 1.96 / 2.576 for 90% / 95% / 99% confidence). This is the standard way to report uncertainty around survey results, lab measurements, or any sample-based estimate. |