Sample Size Calculator

Confidence Interval:
Population:
Confidence Level:
Sample Size:

Confidence Interval Calculator
Sample Size:
Population:
Confidence Level:
Confidence Interval:

Confidence Level Calculator
Sample Size:
Population:
Confidence Interval:
Confidence Level:
 

Sample Size calculator Formula:
   ss = Z2 × P × (1 - P) / C2
Where:
   Z: Z value (1.96 for 95% confidence level, 2.58 for 99%)
   P: Choice percentage ( 0 - 100 )
   C: Confidence Interval ( 0 - 100 )

If population is small, the sample size need adjustment as follows, otherwise, just leave the population field empty:
   ss = ss / ( 1 + (ss - 1)/population)

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