What does the Confidence Interval Calculator work out?

Range that likely contains the true mean. It is one of the Math tools on Mondo Knows.

How is the Confidence Interval Calculator calculated?

You get an instant answer with the working shown underneath.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Confidence Interval Calculator

Range that likely contains the true mean. Use the free confidence interval calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Sample mean

Standard deviation

Sample size

Confidence level

Mondo says

Confidence interval

48.04 to 51.96

Margin of error+/- 1.96

Standard error1

z value1.96

Confidence Interval Calculator: common questions

What does the Confidence Interval Calculator work out?: Range that likely contains the true mean. It is one of the Math tools on Mondo Knows.
How is the Confidence Interval Calculator calculated?: You get an instant answer with the working shown underneath.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.