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Sample Size Calculator For 1 Proportion Test

Hint: Use this calculator to determine the number of samples for achievement percentage (for example accuracy or first-time-right percentage) so as to compare with a standard expected or target value.
  • The minimum acceptable probability of preventing type I error
  • The minimum acceptable probability of preventing type II error
  • This is the standard or target or the known proportion. For 50%, just enter 50
  • Or Margin of Error. Alternatively, if you know the sample proportion, then it is difference between the assumed and the sample proportion. For 5%, just enter
  • Minimum samples required to check if your proportion matches with the standard or known proportion
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