Confidence Interval Calculator

Estimate the range of the population mean or proportion.

Input Parameters

Fill out the fields below to calculate the confidence interval.

Confidence Level (%)

Type of Estimation

Sample Data (comma-separated)

Results

Confidence interval based on your inputs.

Enter values and click Calculate to see the result.

Example with Default Values

Here’s an example calculation with default values. The sample mean is 50, the sample size is 30, the standard deviation is 10, and we are using a 95% confidence level.