Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Statistics
Margin of Error Calculator
Find the margin of error for a survey proportion at a chosen confidence level. Tells you how far a poll result might be from the true population value.
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
| Margin of Error Calculator | Standard Deviation Calculator | |
|---|---|---|
| Category | Statistics | Statistics |
| Inputs required | 3 | 3 |
| Result | Margin of Error (%) | Standard Deviation |
| What it does | Find the margin of error for a survey proportion at a chosen confidence level. Tells you how far a poll result might be from the true population value. | 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. |