Method and definitions
Conversion rate = unique conversions ÷ eligible visitors × 100. Target rate = target ÷ visitors × 100. Relative lift = (target rate − current rate) ÷ current rate × 100.
Count each eligible visitor once for a binary conversion rate. Conversions and target cannot exceed eligible visitors. Relative lift is undefined at a zero baseline. This does not grade a landing page or predict conversion improvement; use a controlled test to evaluate changes.