Email Open Rate Calculator
Calculate your unique open rate, total open rate, and delivery rate instantly. Enter your campaign numbers below.
Enter Your Campaign Data
Your Results
Unique Open Rate
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Unique Opens ÷ Delivered
Total Open Rate
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Total Opens ÷ Delivered
Delivery Rate
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Delivered ÷ Sent
Industry Benchmarks
E-commerce
15–25%
B2B / SaaS
20–30%
Media / Publishing
25–40%
Average unique open rates by industry. Source: industry averages 2024–2025.
How Open Rate is Calculated
Unique Open Rate = (Unique Opens ÷ Emails Delivered) × 100
Total Open Rate = (Total Opens ÷ Emails Delivered) × 100
Delivery Rate = (Emails Delivered ÷ Emails Sent) × 100
Unique opens count each subscriber once, even if they open multiple times. Total opens counts every open event. Most platforms report the unique open rate as the primary metric.
Why Email Open Rate Matters for Your Campaigns
Email open rate is one of the most closely watched metrics in email marketing — and for good reason. It tells you, at a glance, how compelling your subject lines are and how engaged your subscriber list is. A healthy open rate signals that your audience trusts your brand enough to open your messages. A declining one is an early warning sign to act before deliverability or list quality deteriorates further.
Open rates vary significantly by industry. B2B and SaaS senders typically see unique open rates in the 20–30% range, while e-commerce campaigns often sit between 15–25%. Media and publishing lists frequently outperform both, reaching 30–40% when content is highly curated. Comparing your numbers against your own historical performance is more actionable than obsessing over industry averages — trends over time reveal far more than any single campaign result.
The Difference Between Unique and Total Open Rates
Most email platforms surface two open rate figures. The unique open rate counts each subscriber only once, regardless of how many times they opened your email. The total open rate counts every individual open event — so a subscriber who opens the same email three times counts three times. Unique open rate is the standard metric used for benchmarking; total opens is useful for gauging re-engagement and content stickiness.
How to Improve Your Email Open Rate
The most impactful lever is your subject line. Short, curiosity-driven subject lines (under 50 characters) consistently outperform long descriptive ones in A/B tests. Preview text is equally important — treat it as a second subject line. Beyond copy, send-time optimisation, list segmentation, and regular list hygiene (removing disengaged subscribers) all compound over time. If your open rates have dropped sharply, check whether Apple Mail Privacy Protection has inflated your historical numbers; since iOS 15, machine-triggered opens are counted automatically for Apple Mail users, which can distort trends.
Use this calculator to benchmark your open rate, track delivery quality, and spot list health issues before they compound into deliverability problems.