How It Works
n₀=z²p(1−p)/e²; n=n₀/[1+(n₀−1)/N] for a finite population. Round upward. Simple random sampling is assumed; design effects and nonresponse are excluded.
Reference Sources
FAQs
How does this calculator work?
n₀=z²p(1−p)/e²; n=n₀/[1+(n₀−1)/N] for a finite population. Round upward. Simple random sampling is assumed; design effects and nonresponse are excluded.
What assumptions should I check?
Check the units and definitions shown beside each input. Results use the values you enter.