Sample Size Calculator

Solve Sample Size with a transparent method.

What do you want to plan?Use 0 for population size when the population is very large or unknown.

2 options

Confidence level

Expected proportion

Target margin of error

Population size

REQUIRED SAMPLE SIZE385

Required sample size: Plans a proportion sample from confidence and precision, applies finite-population correction when a population is supplied, and can reverse the formula to show achieved margin.

Confidence level: 95%
Critical Z: 1.95996399
Expected proportion: 0.5
Population: Unlimited
Unlimited-population estimate: 384.14588269
Required sample size: 385
Target margin of error: 0.05

Estimate based on the values shown

Formula checkedPlans a proportion sample from confidence and precision, applies finite-population correction when a population is supplied, and can reverse the formula to show achieved margin.

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