Math

Sample Size Calculator

Calculate the required sample size for a survey or study based on confidence level, margin of error, and population size.

Using the Sample Size Calculator

How many people do you need to interview to get a representative sample? This calculator determines the required sample size for your survey or experiment based on your desired confidence level, margin of error, and total population size.

How it Works

Enter your total "Population Size" (if known).

Select your "Confidence Level" (e.g., 95%).

Input your acceptable "Margin of Error" percentage.

Review the "Required Sample Size" to ensure your results are statistically valid.