Everyday tool
Confidence Interval Calculator for a Mean
Enter the sample mean, known population standard deviation, sample size and confidence level.
Runs in your browser. No upload.
Values are processed locally in this browser.
Result
About this tool
Confidence Interval Calculator for a Mean made simple.
This page intentionally uses a z interval with a known population standard deviation. It is not a t interval and should not be used when its assumptions are unsuitable.
Common questions
About Confidence Interval Calculator for a Mean.
How do I use Confidence interval calculator?
Enter the sample mean, known population standard deviation, sample size and confidence level.
Is my data uploaded to a server?
No. This tool runs locally in your browser. Your input is not uploaded.