# Confidence Interval Calculator

## Confidence Level Calculator

**Confidence Interval Calculator**. Enter how many in the sample, the mean and standard deviation, choose a confidence level, and the calculation is done live.

## How It Is Calculated

The Confidence Interval formula is

x̄ ± Z \frac{s}{√n}

Where:

**x̄**is the mean**Z**is the Z-value from the table below**s**is the standard deviation**n**is the number of observations