Marketing
Email Open Rate Calculator
Calculate open rate from delivered emails and opens, or reverse the formula to estimate the missing metric.
Enter delivered emails and opens to calculate open rate.
Advertisement
Open Rate Formula
Calculate Rate
Rate = (Opens / Delivered) x 100
Calculate Opens
Opens = (Rate / 100) x Delivered
Calculate Delivered
Delivered = Opens / (Rate / 100)
What is email open rate?
Email open rate is an engagement metric that estimates how many delivered emails were opened. It is often used to judge subject line strength, audience relevance, and sender recognition.
Open rates are useful, but they are only one piece of the picture. Teams usually combine open rate with click rate, unsubscribe rate, and conversion rate to understand true email performance.
Frequently asked questions
What is email open rate?
Email open rate is the percentage of delivered emails that were opened by recipients. It is a key metric for measuring subject line effectiveness and overall list engagement.
How do I calculate open rate?
Divide opens by delivered emails and multiply by 100. If 4,000 emails are opened out of 20,000 delivered, your open rate is 20%.
What affects email open rate?
Subject lines, sender reputation, list quality, send timing, and audience relevance all influence open rate. Apple Mail Privacy Protection has also inflated open rates for many senders since 2021.
What is a good email open rate?
Average open rates typically range from 20% to 40% depending on industry and list quality. Transactional emails and tightly segmented lists often achieve higher rates, while large broadcast lists to unengaged subscribers tend to see lower rates.
Has Apple Mail Privacy Protection affected open rate accuracy?
Yes. Since iOS 15, Apple Mail pre-fetches email pixels for privacy protection, which registers opens even when a recipient never opens the email. This means open rates from Apple Mail users are artificially inflated, making click rate and conversion a more reliable measure of true engagement.