Sample Size Calculator for 2 Proportion Test

Hint: Use this calculator to determine the number of samples required to compare two population proportions

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%
Proportion 1
Enter the first population proportion. For 50%, just enter 50
Proportion 2
Enter the second population proportion. For 45%, just enter 45
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Number1
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Number2
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Number3
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Number4
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Number5
Sample Size (2 – proportion test)
Minimum samples required to check if the two proportions are similar or not

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