Calculate your email open rate instantly. Enter emails sent, delivered, and opened to find your open rate, delivery rate, and benchmark against industry averages.
Total emails in the campaign send
Hard + soft bounces combined
Unique opens (not total opens)
Email Open Rate
24.74%Average
Industry average — consistent with most B2C email programmes.
Delivery Rate97%
emails reached inbox
Delivered4,850
emails
How was this calculated?
1
Emails Delivered
5,000 sent − 150 bounced = 4,850
2
Delivery Rate
(4,850 ÷ 5,000) × 100 = 97%
3
Open Rate
(1,200 ÷ 4,850) × 100 = 24.74%
What is a Open Rate?
An Email Open Rate Calculator measures the percentage of recipients who opened your email campaign, giving you the first signal of whether your subject line and sender reputation are working. It is the top-of-funnel metric for email marketing — before a subscriber can click your link, make a purchase, or respond to your offer, they have to open the email first.
The formula uses delivered emails as the denominator, not total sent. This matters because bounced emails (those that never reached the inbox) should not count against your open rate — they were never a real opportunity to be opened. Subtracting bounces from sent gives you the delivered count, and dividing unique opens by that number gives an accurate picture of inbox engagement.
Open rate is most valuable as a comparative metric rather than an absolute one. Comparing your open rate against industry benchmarks tells you whether your performance is competitive. Comparing campaign-over-campaign within your own list tells you whether your engagement is growing or declining. A 22% open rate means very little on its own — knowing it is above your category average of 18% or down from last month's 26% makes it actionable.
For email marketers in India running campaigns on platforms like Mailchimp, Klaviyo, Sendinblue, or HubSpot, open rate is typically the first metric in the performance dashboard. Pair it with CTR Calculator to measure the full engagement journey from subject line click through to content engagement.
How to use this Open Rate calculator
Enter Emails Sent — the total number of emails in your campaign send, including all addresses regardless of delivery outcome.
Enter Emails Bounced — the total bounce count combining hard bounces (permanent failures) and soft bounces (temporary failures). Your ESP dashboard provides this count post-send.
Enter Emails Opened — the unique open count, not total opens. Most ESPs show both; use unique opens to avoid counting the same recipient multiple times.
Read your Open Rate — the primary output shows your rate with the Low/Average/Good/Excellent benchmark and a recommendation for what the rating means for your strategy.
Formula & Methodology
Emails Delivered = Emails Sent − Emails BouncedOpen Rate (%) = (Emails Opened ÷ Emails Delivered) × 100Delivery Rate (%) = (Emails Delivered ÷ Emails Sent) × 100Worked example using realistic values:
An Indian D2C fashion brand sends a campaign:
- Emails Sent: 12,000
- Emails Bounced: 360 (3% bounce rate)
- Emails Opened: 3,312 (unique opens)
Emails Delivered = 12,000 − 360 = 11,640
Open Rate = (3,312 ÷ 11,640) × 100 = 28.5% (Good)
Delivery Rate = (11,640 ÷ 12,000) × 100 = 97%Assumptions:
- Open rate is calculated using unique opens. Total opens (which count repeated opens by the same person) will give a higher number but is not the standard metric.
- Apple Mail Privacy Protection (MPP) may inflate open rates for lists with significant iOS Apple Mail users by pre-fetching content and triggering tracking pixels without actual opens.
- The benchmark ranges (Low/Average/Good/Excellent) are generalised cross-industry averages. Industry-specific benchmarks vary: B2B email typically averages 25–30%, consumer retail typically 15–22%.
Frequently Asked Questions
What is email open rate?
Email open rate is the percentage of delivered emails that were opened by recipients. It is calculated by dividing the number of unique opens by the number of emails successfully delivered (sent minus bounced), then multiplying by 100. Open rate is the first engagement metric in the email funnel — it measures whether your subject line and sender reputation are compelling enough to get emails read.
What is the formula for email open rate?
Open Rate (%) = (Emails Opened ÷ Emails Delivered) × 100, where Emails Delivered = Emails Sent − Emails Bounced. For example, if you sent 5,000 emails, 150 bounced, and 1,200 were opened: Emails Delivered = 4,850; Open Rate = (1,200 ÷ 4,850) × 100 = 24.7%. Always use delivered emails as the denominator, not sent emails, to get an accurate open rate.
What is a good email open rate?
An open rate of 15–25% is considered average across most industries. Rates of 25–35% are good, and above 35% is excellent. Below 15% typically indicates deliverability problems, weak subject lines, or list quality issues. B2B emails and transactional emails (order confirmations, receipts) tend to have higher open rates (30–50%) than promotional campaigns. The benchmark also varies significantly by industry — finance and healthcare emails average higher than retail.
What is the difference between unique opens and total opens?
Unique opens count each recipient once regardless of how many times they opened the email. Total opens count every instance of opening, including multiple opens by the same person. Open rate should always be calculated using unique opens — using total opens inflates the metric by 20–40% for most campaigns. Most email service providers (ESPs) like Mailchimp, Klaviyo, and HubSpot report unique open rate by default.
Why is Apple Mail Privacy Protection affecting open rates?
Apple's Mail Privacy Protection (MPP), introduced in iOS 15, pre-fetches email content for Apple Mail users, which triggers tracking pixels even if the email is never actually opened. This artificially inflates open rates for campaigns with a significant iOS audience. Many marketers have seen reported open rates increase by 10–15 percentage points since MPP launched, making the metric less reliable as an absolute measure. Focus on click-through rate and conversion rate as more reliable engagement signals.
How can I improve my email open rate?
The most impactful factors for open rate are subject line quality (clear benefit, curiosity, or urgency without clickbait), sender name recognition (using a person's name rather than a company name typically increases opens by 15–20%), send time optimisation (test Tuesday–Thursday mornings for B2B, evenings for B2C), and list hygiene (removing inactive subscribers improves delivery and engagement rates). A/B testing subject lines with a 20% sample before full send is the fastest way to improve open rates systematically.
What is bounce rate and how does it affect open rate?
Email bounce rate is the percentage of emails that could not be delivered. Hard bounces (invalid addresses) permanently fail delivery; soft bounces (full inbox, temporary server issues) may succeed on retry. High bounce rates damage sender reputation with ISPs, which reduces deliverability for future campaigns — fewer emails reaching inboxes means fewer opportunities to be opened. Keeping bounce rate below 2% is the standard recommendation. This calculator accounts for bounces by using delivered emails as the denominator.
How does open rate relate to click-through rate?
Open rate and click-through rate (CTR) together form the core of email engagement measurement. Open rate shows whether your subject line gets attention; CTR shows whether your email content and call-to-action convert that attention into action. A high open rate with a low CTR indicates the subject line is compelling but the email body or offer is not. Calculate your [CTR](/ctr-calculator/) alongside open rate for a complete view of email performance.
How often should I measure email open rate?
Measure open rate for every campaign send, and track trends by campaign type and send day/time. Segment open rates by email type (promotional, transactional, re-engagement), by list segment, and by sending frequency to identify which combinations perform best. Month-over-month trend is more meaningful than individual campaign rates — a consistently declining open rate over 3–4 months is the signal to review list health and content strategy.
What open rate should I expect for Indian email marketing?
Indian email campaigns typically see open rates of 15–30% depending on industry and list quality. B2B companies in India targeting decision-makers often see higher rates (25–40%) due to more relevant, targeted sends. Consumer brands see rates closer to the global average (15–22%). Festival campaign emails (Diwali, Holi) typically outperform regular promotional sends by 20–30% due to high purchase intent periods.
How does list hygiene affect email open rate?
List hygiene — removing invalid addresses, unsubscribers, and chronically inactive subscribers — is one of the most impactful open rate improvements available. A list with 20% inactive subscribers will show a diluted open rate, while a clean list of engaged subscribers consistently shows higher rates. Most email marketers recommend running re-engagement campaigns for subscribers inactive for 90+ days, then removing those who remain unresponsive.
What email open rate metrics should I track beyond the standard rate?
Beyond standard open rate, track: (1) Open rate by device type (mobile vs desktop — typically 60–70% of opens are mobile), (2) Time-to-open distribution (do most opens happen in the first hour?), (3) Open rate by list segment (new subscribers, VIPs, inactive), and (4) Repeat open rate (what percentage of openers open more than once). These dimensions reveal where open rate improvements will have the most impact.