Free A/B-test calculator by @onlinedialogue for ABTestGuide.com

Test result

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Variation B's observed conversion rate () was higher than variation A's conversion rate (). You can be 95% confident that this result is a consequence of the changes you made and not a result of random chance.
The observed difference in conversion rate () isn't big enough to declare a significant winner. There is no real difference in performance between A and B or you need to collect more data.

Visualisation of Power () and the expected distributions of variation A and B.

Conversion Rate Control
Conversions A / Visitors A

            
Conversion Rate B
Conversions B / Visitors B

            
Relative uplift in Conversion Rate
CRB - CRA / CRA

            

Power

            
p value

            
Z-score
( CRB - CRA ) / SEdifference

            
Standard error B
( CRA * (1-CRA ) / VisitorsA)1/2

            
Standard error B
( CRB * (1-CRB ) / VisitorsB)1/2

            
Std. Error of difference
SEdifference = ( SEA2 + SEB2 )1/2