Sample size calculator

Calculate the minimum sample for your study with Cochran's formula and the finite population correction.

Sample size calculator (Cochran's formula)

Population size (leave it empty if very large) Confidence level Margin of error Non-response buffer

Minimum sample385

Number of questionnaires to distribute428

Assuming a proportion of 0.5 (the most conservative).

About the tool

The calculator uses Cochran's formula assuming a proportion of 0.5, the most conservative since it gives the largest sample. When the population size is known, the finite population correction is applied.

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