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Confidence Interval Calculator

Calculate confidence intervals for means and proportions.

Type

Sample Size

Sample Mean

Standard Deviation

Confidence Level

Enter the required values to calculate the confidence interval for either a mean or a proportion.

How to Use

This calculator computes the confidence interval for either a mean or a proportion.

Select Type: Choose whether you want to calculate the confidence interval for a mean or a proportion.
Enter Sample Size: Enter the size of the sample.
Enter Values:
- If calculating for a mean, enter the sample mean and standard deviation.
- If calculating for a proportion, enter the number of successes.
Select Confidence Level: Choose the desired confidence level (90%, 95%, or 99%).
Calculate: Click the "Calculate" button to compute the confidence interval.
View Result: The lower bound, upper bound, and margin of error will be displayed.