Campaign Conversion Rate

Campaign conversion rate is the share of a specific campaign's users or sessions that reached the target outcome; a conversion rate, but scoped to one campaign's traffic.

This metric is the conversion rate with a filter: only traffic carrying that campaign's UTM tag. Its value is in comparison, because a campaign cannot be judged alone; the conversion rate of an email campaign and a paid-click campaign must be set side by side. It has two traps. First, the denominator must share the basis of the other rates, session-based or user-based, or the comparison is meaningless. Second, a high conversion rate is not automatically a good campaign: a small, tightly targeted campaign can show a high rate on negligible volume, so the rate must always be read beside the absolute conversion count. And because this rate only sees a conversion that happened in the entry session itself, for awareness campaigns whose effect returns later by another path it understates the number.