This calculator helps you find the appropriate sample size for estimating the proportion of a population that has a particular property within a specified margin of error.

You need to provide the confidence interval, the margin of error, and the sample proportion (%) below and click the ‘Calculate’ button:

Recommended sample size: **385**

The confidence interval is usually 90%, 95%, or 99%. If you don’t know the sample proportion, leave it as 50%.

The formula to calculate the sample size is:

`n = p*(1-p)*(Z`_{α/2}/E)^{2}

Where `n`

is the sample size, `p`

is the sample proportion,
`Z`

is the z critical value, and _{α/2}`E`

is the margin of error.

I hope this calculator is useful. Happy analyzing!