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Email Marketing Metrics Calculator
Turn the raw numbers from a campaign report into the rates that matter: open rate, click-through rate, click-to-open rate, bounce, unsubscribe and spam complaint rates, conversion rate and revenue per email.
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Delivery
Engagement
Results (optional)
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Platform, design and copy costs for this send
Enter your values to see the result.
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How to use the Email Marketing Metrics Calculator
- Copy the counts from your email platform's campaign report: sent, bounces, unique opens and unique clicks.
- Add unsubscribes and spam complaints for the same send.
- Optionally enter conversions, revenue and cost from your store or analytics.
- Press Calculate email metrics to see every rate with the working.
- Review the health check and download it as CSV to track sends over time.
Email marketing metric formulas
| Metric | Formula | What it tells you |
|---|---|---|
| Delivered | Sent − bounces | Emails that reached a mail server |
| Bounce rate | Bounces ÷ sent × 100 | List quality and sender reputation |
| Open rate | Unique opens ÷ delivered × 100 | Subject line and sender name pull (approximate) |
| Click-through rate | Unique clicks ÷ delivered × 100 | Overall campaign engagement |
| Click-to-open rate | Unique clicks ÷ unique opens × 100 | Content and call-to-action strength |
| Unsubscribe rate | Unsubscribes ÷ delivered × 100 | Relevance and sending frequency |
| Spam complaint rate | Complaints ÷ delivered × 100 | Deliverability risk |
| Conversion rate | Conversions ÷ unique clicks × 100 | Landing page and offer |
| Revenue per email | Revenue ÷ delivered | Value of each send, comparable across list sizes |
Worked example
A newsletter goes to 20,000 subscribers. 240 bounce, so 19,760 are delivered (bounce rate 1.2%). 6,900 people open (open rate 34.92%) and 610 click (CTR 3.09%, CTOR 8.84%). 48 of the clickers buy, a 7.87% conversion rate, bringing in $3,600, which is about $0.18 per delivered email, or $182 per 1,000 delivered.
Tips for reading your numbers
- Compare like with like. Track the same metrics per campaign type (newsletter, promotion, automation), because they behave very differently.
- Low CTOR with a good open rate means the subject line worked but the content or offer did not. Test layout, a single clear call to action and the first lines of copy.
- Rising unsubscribes often follow a jump in frequency. Try a preference centre that lets people choose fewer emails instead of leaving.
- Complaints matter most. A few complaints per thousand can hurt inbox placement for your whole list, so make the unsubscribe link easy to find and honour it quickly.
Frequently asked questions
How is email open rate calculated?
Open rate = unique opens ÷ delivered emails × 100. Delivered emails are emails sent minus bounces. For example, 6,900 unique opens from 19,760 delivered emails is a 34.92% open rate.
What is the difference between CTR and click-to-open rate?
Click-through rate (CTR) divides unique clicks by delivered emails, so it measures the whole campaign. Click-to-open rate (CTOR) divides unique clicks by unique opens, so it measures how compelling the content was for people who actually opened.
Why are open rates less reliable now?
Since 2021, Apple Mail Privacy Protection preloads email images, which registers an open even if the person never looks at the email. Other privacy tools block images, hiding real opens. Many marketers now judge campaigns mainly on clicks, conversions and revenue.
What is an acceptable spam complaint rate?
Gmail and Yahoo's bulk sender requirements, in force since 2024, ask senders to keep spam complaint rates below 0.3%, and Google recommends staying under 0.1%. Above that, more of your mail can land in spam.
What is a good bounce rate?
A total bounce rate under about 2% is a widely used target. Higher bounce rates usually mean an old or purchased list. Remove hard bounces (invalid addresses) right away and clean your list regularly.
How do I calculate revenue per email?
Revenue per email = revenue attributed to the campaign ÷ emails delivered. Some teams divide by emails sent instead; the calculator shows both. Multiplying by 1,000 gives revenue per thousand emails, handy for comparing campaigns of different sizes.
Should I use unique or total opens and clicks?
Use unique counts, which count each subscriber once. Total counts include repeat opens and clicks by the same person and make rates look higher than the share of people who engaged.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.
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