Sample Size Calculator

Sample Size- Infinite Population(where the population is greater than 50,000) = Z2*(p)*(1 p)C2 

Confidence Level: %
(Enter 90% or 95% or 99% )

Margin of Error (or) Confidence Interval(C):


Sample Size =


Sample Size Calculator is a free online tool that displays the sample size from the given population. BYJU’S online sample size calculator tool makes the calculation faster, and it displays the sample size in a fraction of seconds.

How to Use the Sample Size Calculator?

The procedure to use the sample size calculator is as follows:

Step 1: Enter the confidence level, interval and prevalence in the respective input field

Step 2: Now click the button “Calculate Sample Size” to get the result

Step 3: Finally, the sample size for the given input will be displayed in the output field

What is Meant by Sample Size?

In Statistics, the sample size is defined as the number of observations which are taken from the population where the statistical interference for the whole population is made. For example, if you test 50 species, then your sample size is 50. The sample size is usually determined based on the time, cost, and the convenience of collecting the data. The formula to calculate sample size is given as

Sample size =

\(\begin{array}{l}\frac{Z^{2}p(1-p)}{C^{2}}\end{array} \)


Z = z- value

C = confidence interval

p = percentage population (or prevalence)


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