# Confidence Interval for Proportions

Calculate the confidence interval (CI) of a proportion with the given inputs of sample size, frequency and chosen confidence level.

## Population Confidence Interval for Proportions Calculation

Code to add this calci to your website

#### Formula:

Confidence Interval = p ± Z_{α/2} × √[(p×q)/n] , (x, n-x≥5)
**Where,**
p = x/n
q = 1-p
α = 1 - (Confidence Level/100)
x = Frequency
n = Sample Size
Z_{α/2} = Z-table value
Online calculation of *Population Confidence Interval (CI) for Proportions* is made easier.