Confidence Interval Calculator

Estimate population mean confidence interval from sample statistics.

Parameters

Sample Mean

Sample Std Dev

Sample Size

Confidence Level

Result

Please enter parameters and click Calculate

Usage

Features

This calculator uses the t-distribution to estimate the confidence interval for the population mean based on sample statistics, with visualization.

Steps

Enter sample mean, standard deviation and sample size → Select confidence level (90%/95%/99%) → Click "Calculate" to view confidence interval and key statistics

Notes

Higher confidence yields wider intervals; larger samples yield narrower intervals. Uses normal approximation, suitable for large samples (n ≥ 30); small sample results are for reference only.