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Confidence interval calculator
Confidence interval for a mean or a proportion at 90, 95 or 99%.
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About Confidence interval calculator
Enter your sample mean, standard deviation and size, or a proportion, and pick 90, 95 or 99 percent. The interval is the estimate plus or minus a critical value times the standard error. Useful for survey results and A/B tests where one number alone hides the uncertainty.
How to use Confidence interval calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
What does a 95% confidence interval actually mean?
If you repeated the sampling many times, about 95 percent of the intervals built this way would contain the true value. It does not mean a 95 percent chance for this one interval.
Is Confidence interval calculator free?
Yes. Confidence interval calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.