This free sample size calculator determines the sample size required to meet a given set of constraints. Also, learn more about population standard deviation.

Calculate sample size with our free calculator and explore practical examples and formulas in our guide to find the best sample size for your study.

Jun 30, 2025 · To calculate sample size, first find the population size, or number of people taking your study, and margin of error, which is the amount of error you'll allow in your results.

You can use this free sample size calculator to determine the sample size of a given survey per the sample proportion, margin of error, and required confidence level.

Easily calculate your required sample size with our Sample Size Calculator. Fast, accurate, and perfect for surveys and research planning.

May 15, 2025 · Learn how to calculate survey sample sizes by exploring margin of error, confidence levels, population variability, and practical formulas.

Calculate the required sample size for your statistical study based on confidence level, margin of error, and population parameters.