Planning resource
Cold Email Metrics Glossary
A plain-language cold email metrics glossary: definitions, formulas, and the difference between every rate from open to close.
Why this matters
A shared vocabulary prevents the most common analytics mistake: treating two different rates as if they were one. This glossary defines each cold email metric, gives the formula, and notes what it does — and does not — tell you.
Core metric definitions
Metric, formula, and what it actually means
| Metric | Formula | What it tells you |
|---|---|---|
| Delivery rate | Delivered ÷ Sent × 100 | Whether mail is accepted by receivers |
| Open rate | Opened ÷ Delivered × 100 | First-impression strength (inflated by auto-preload) |
| Click rate | Clicks ÷ Delivered × 100 | Whether the offer earns exploration |
| Reply rate | Replies ÷ Delivered × 100 | Whether the message prompts a response |
| Positive reply rate | Positive replies ÷ Delivered × 100 | Genuine interest — the pipeline signal |
| Meeting rate | Meetings ÷ Positive replies × 100 | Whether interest converts to a conversation |
| Attended rate | Attended ÷ Booked × 100 | Whether meetings actually happen |
| Close rate | Clients ÷ Meetings × 100 | Whether conversations become revenue |
| Cost per meeting | Total cost ÷ Meetings | Unit economics of outreach |
| CAC | Total cost ÷ Clients | True acquisition cost |
| ROI | (Revenue − Cost) ÷ Cost × 100 | Whether the campaign pays back |
Open rate vs click rate vs reply rate
Open rate proves the email was seen (imperfectly). Click rate proves a link earned action. Reply rate proves the message prompted a response. They sit at different funnel depths, so a campaign can score well on one and poorly on another — read them together, never as substitutes.
Reply rate vs positive reply rate
Total reply rate includes 'not interested', out-of-office, and auto-replies. Positive reply rate counts only genuine interest. Because only positive replies feed meetings, positive reply rate is the metric that matters for pipeline — always track it separately.
Meeting rate vs attended rate vs close rate
Meeting rate measures booked calls from positive replies. Attended rate measures shows — a leak here is a scheduling problem, not outreach. Close rate measures clients from meetings. Each is a distinct leak point in the revenue chain.
Rate vs absolute count
Always show counts
A 50% meeting rate from 2 positive replies is not the same as 50% from 200. Report absolute counts next to every rate so small samples are not mistaken for strong performance.
Glossary use checklist
- Separate total reply rate from positive reply rate in every report.
- Show absolute counts beside every rate.
- Use 'delivered' as the denominator consistently.
- Define CAC and ROI with the same cost basis across reports.
- Label benchmark ranges as educational, not guarantees.
Frequently asked questions
What does each cold email metric mean?
Each metric is a stage rate in the funnel from sent to client — delivery, open, click, reply, positive reply, meeting, attended, and close — plus cost and ROI. The glossary table defines each with its formula.
What is the difference between CTR and reply rate?
Click rate measures link clicks after open; reply rate measures replies after delivery. Clicks show exploration, replies show a willingness to talk — different funnel depths.
How are cold email rates calculated?
Divide the stage outcome by the stage input (usually delivered), then multiply by 100. Use the same denominator across all campaigns so rates stay comparable.
Related pages
Model your own numbers
Use the ColdMailCalculator to turn assumptions into a reviewable forecast instead of a guess.
Forecasts and metrics ranges are educational estimates based on user-provided assumptions. Results are not guaranteed. This content is not legal, financial, deliverability, or business advice.