Definition
Campaign performance refers to the quantitative and qualitative measurement of an individual email campaign's effectiveness. It is assessed using a standardised set of metrics that track delivery, engagement, conversion, and revenue. Analysing campaign performance helps marketers understand what works, what does not, and how to improve future sends.
Campaign performance analysis should always be tied to the specific goal of the campaign — a newsletter's success is measured differently than a promotional offer or a transactional email.
Core Campaign Performance Metrics
| Metric | What It Measures | Formula |
|---|---|---|
| Delivery Rate | Percentage of emails that reached the inbox | (Delivered / Sent) × 100 |
| Open Rate | Percentage of delivered emails that were opened | (Unique Opens / Delivered) × 100 |
| Click-Through Rate | Percentage of delivered emails that received a click | (Unique Clicks / Delivered) × 100 |
| Click-to-Open Rate | Percentage of opens that resulted in a click | (Unique Clicks / Unique Opens) × 100 |
| Conversion Rate | Percentage of recipients who completed the goal | (Conversions / Delivered) × 100 |
| Bounce Rate | Percentage of emails that bounced | (Bounces / Sent) × 100 |
| Unsubscribe Rate | Percentage of recipients who unsubscribed | (Unsubscribes / Delivered) × 100 |
| Revenue per Email | Total revenue generated divided by emails sent | Revenue / Delivered |
How to Analyse Campaign Performance
- Compare to benchmarks: Evaluate metrics against industry averages and your own historical performance
- Segment results: Break down performance by subscriber segment, device type, and send time
- Identify trends: Look for patterns across multiple campaigns rather than evaluating in isolation
- Correlate metrics: A high open rate with a low click rate may indicate misleading subject lines
- Calculate ROI: Compare revenue generated against campaign costs including creative, platform, and labour
Common Pitfalls
- Vanity metrics: Focusing on opens when the campaign goal is conversions
- Ignoring sample size: Drawing conclusions from small send volumes where metrics are less reliable
- Not segmenting: Aggregate metrics hide important differences between subscriber groups
- Short-term thinking: Optimising for immediate clicks while ignoring long-term subscriber value
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Frequently Asked Questions
The most important metric depends on the campaign goal. For a sales promotion, conversion rate and revenue per email matter most. For a newsletter, click-through rate and engagement over time are more relevant. Always tie measurement to the specific campaign objective.
Most engagement happens within 24-48 hours of send time, but significant clicks can occur days or weeks later. Measure at 24 hours for initial assessment, 7 days for final performance, and consider longer windows for B2B campaigns with longer sales cycles.
Cross-industry averages: open rate 18-22%, click-through rate 2.5-3.5%, click-to-open rate 20-30%, bounce rate under 3%, unsubscribe rate under 0.5%. However, benchmarks vary significantly by industry, audience, and campaign type.