Find the percentage of delivered emails that were opened to measure campaign engagement.
Opens — Value for opens. Provide accurate numbers for a reliable Open Rate. Example: 420.
Delivered — Value for delivered. Provide accurate numbers for a reliable Open Rate. Example: 2000.
Open Rate
21%
Open Rate — Percentage %. Above 0 increases with input; compare to benchmarks or goals.
Did Not Open
1,580
Did Not Open — Calculated outcome. Derived from your inputs via the displayed formula; use to plan.
What this means
Count unique opens and divide by the number of successfully delivered emails. Apple Mail Privacy Protection can inflate open counts, so read trends over time.
Open rate measures how many delivered recipients opened your email. It is a core engagement metric for email marketers.
Formula
open rate = opens ÷ delivered × 100
Worked examples
FAQ
What is a good open rate?
20–30% is fair for many industries, but benchmarks vary by sector and list freshness.
Can opens exceed delivered?
Physically unusual; the calculator clamps the rate at 100% in that case.