Conversion uplift depends on the number of variations present.
With 1 variation: Uplift = ((conversion variation 1 / impressions variation 1) / (Conversions control / Active Targets control) -1) *100
When 2 or more variations are present in the control group: Uplift = (( 1Varcount Conversionsvariations i / 1Varcount impressionsvariations i ) / (Conversions control / Active Targets control) -1) *100