Margin of Error Calculator

This calculator determines the margin of error based on the confidence level, population and sample sizes, and population proportion.

Confidence Level:

Sample Size:

Population Size:

Leave it blank if the population size is unlimited.

Population Proportion:

Margin of Error:

How to Use the Margin of Error Calculator?

First, select the confidence level in terms of percentage.
Input the sample and population sizes. Leave the population size field empty if it's unlimited.
Input the population proportion value. By default, it's 50%. Leave it as it is if it's unknown.
Press the 'Calculate' button.
As a result, the tool returns the margin of error or confidence interval of the survey or observation.