Sample Size Calculator for 1 Proportion Test

List of Calculators

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.

Confidence Level
The minimum acceptable probability of preventing type I error
- 90%
- 95%
- 99%
- 99.9%
Power of Test
The minimum acceptable probability of preventing type II error
- 50%
- 80%
- 90%
- 95%
- 99%
Assumed Proportion
This is the standard or target or the known proportion. For 50%, just enter 50
Acceptable Difference %
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
Sample Size (1-proportion test)
Minimum samples required to check if your proportion matches with the standard or known proportion