Open Rate, Response Rate, Conversion Rate: Outreach Metrics Explained

Open rate is the percentage of delivered messages that were opened. In email it is tracked with an invisible pixel that loads when the message is rendered; typical cold email open rates run 40–60% for a healthy sender with a clean list. Below roughly 30%, the problem is almost never the subject line — it is deliverability (messages landing in spam) or list quality (dead addresses).

Two big caveats. First, email open tracking has been unreliable since Apple's Mail Privacy Protection began auto-loading pixels in 2021, inflating opens from Apple Mail users regardless of whether a human looked. Second, DMs have no open rate in the email sense — platforms show "seen" indicators per conversation, but message requests on Instagram or TikTok can sit unseen indefinitely, so DM senders generally skip straight to reply rate as the first trustworthy number.

Response rate (or reply rate) is the percentage of delivered messages that received any reply. It is the most honest top-line metric in outreach because it cannot be inflated by tracking artifacts: a human either typed something back or did not. Benchmarks: cold email averages 1–5%, well-personalized email to a tight list 10–20%, and social DMs commonly 10–25% when targeting recently engaged users.

The refinement that matters is positive reply rate — the share of replies that are interested or open, as opposed to "no thanks," "unsubscribe," or hostility. A campaign with a 15% reply rate that is mostly annoyance is performing worse than one with 8% mostly curious replies. Teams that only track raw replies routinely optimize toward provocation, because provocation reliably generates answers.

Conversion rate is the percentage of recipients (or of replies — definitions vary, so state yours) who completed the goal action: booked a call, started a trial, made a purchase, joined a team. Because cold audiences are by definition low-intent, end-to-end conversion is small in absolute terms — converting 1–2% of a cold list into a booked meeting is a solid result, and a fraction of those become customers.

The single most common reporting error is comparing conversion rates with different denominators. "30% conversion" from reply-to-call and "2% conversion" from sent-to-call can describe the same campaign. Any conversion number quoted without its denominator is decoration.

A handful of secondary numbers complete the picture:

• Bounce rate — the share of messages that could not be delivered. Above 2–3% in email signals a stale list and actively damages sender reputation.
• Click-through rate — the share who clicked a link, where one is used. Mostly relevant when the goal is a booking page or piece of content.
• Opt-out / block rate — unsubscribes, "stop" replies, or blocks. A rising number here is an early warning that targeting or volume is off, often before reply rates visibly fall.
• Meetings booked and show rate — the bridge metrics between outreach and revenue; a strong reply rate with a weak show rate points at qualification, not messaging.
• Time to reply — how quickly answers arrive; most replies land within 24–48 hours of a touch, which is why sequences space messages days apart rather than hours.

The power of these metrics is that each one isolates a different failure. Low open rate: a delivery or list problem — fix infrastructure and data before touching copy. Healthy opens but low replies: a relevance problem — wrong audience or a message about you instead of them. Healthy replies but low conversion: an offer or qualification problem — the conversation starts but there is nothing compelling to advance to.

Worked example: 1,000 messages, 50% opened, 5% replied, 20% of repliers booked a call — that is 500 opens, 50 conversations, 10 meetings. Doubling reply rate doubles meetings; raising open rate by ten points adds two. The funnel tells you precisely where effort pays, which is the entire reason to measure it.