Margin of Error Calculator - Free, Instant, In Your Browser
Enter the standard deviation and sample size to calculate the margin of error at 95% confidence.
How to use Margin Of Error Calculator
- 1Enter the required date(s) and details above.
- 2Click Calculate - Margin Of Error Calculator runs instantly, right in your browser.
- 3Read your result below.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
What's the formula?
Margin of error = 1.96 x (standard deviation / √(sample size)), the half-width of the 95% confidence interval.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.