Use our sample size and survey planning calculators to estimate the number of participants, observations, or responses needed for a study. These tools help you work with key planning values such as sample size, margin of error, confidence level, population size, and sampling precision.
This section includes calculators for common sample size formulas, including Cochran’s formula, Slovin’s formula, and Yamane’s formula, as well as related tools that help you understand how the margin of error changes with sample size. These calculators are useful when planning surveys, research studies, polls, academic projects, or any analysis where choosing an appropriate sample is important.
Choose the calculator that matches your question, enter the required values, and review the step-by-step explanation to understand how the result is calculated.