How to calculate ab testing sample size

Do you know formul for calculating ab testing sample size per variation base on:

1. Baseline Conversion Rate


2. Minimum Detectable Effect


3. Statistical Significance


4. Statistical Power

It is a few online tool to calculate the sample size:

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  http://ift.tt/1nkD3A6

  
  


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  http://ift.tt/1h2K2xW