About the Email Marketing Metrics Calculator
This email marketing metrics calculator turns the raw counts from a campaign report — emails sent, bounces, unique opens, unique clicks, unsubscribes, spam complaints, conversions and revenue — into the rates marketers actually compare: delivery rate, open rate, click-through rate, click-to-open rate (CTOR), bounce rate, unsubscribe rate, complaint rate, conversion rate and revenue per delivered email.
It is useful when your email platform reports numbers differently from a benchmark you are reading, when you combine several sends into one total, or when you want to see a campaign at a glance. Rates are calculated on delivered emails (sent minus bounces), the most common convention, and bounce rate on emails sent.
Since Apple Mail Privacy Protection began pre-loading images, open rates are inflated for many lists, so click rate and CTOR are more reliable signals of engagement. Keep spam complaints well under 0.3% — Gmail and Yahoo bulk-sender rules use that threshold.
With the default inputs, the open rate is 32.49%. Change any value above to recalculate instantly.
How to use the email marketing metrics calculator
- 1Copy sent, bounces, unique opens and unique clicks from your email platform report.
- 2Add unsubscribes and spam complaints for the same send.
- 3Optionally enter conversions and revenue attributed to the campaign.
- 4Review open rate, CTR and CTOR against your own past campaigns.
- 5Watch the bounce and complaint rates to protect deliverability.
Formula and method
Engagement rates (open, click, unsubscribe and complaint) are divided by delivered emails, because bounced messages never reached an inbox. Bounce rate is divided by emails sent. Click-to-open rate divides unique clicks by unique opens and shows how compelling the content was to people who actually opened it.
Conversion rate is conversions divided by unique clicks, and revenue per email is campaign revenue divided by delivered emails. Use unique (not total) opens and clicks so one person opening five times counts once.
- CTR
- Click-through rate: unique clicks ÷ delivered
- CTOR
- Click-to-open rate: unique clicks ÷ unique opens
Worked examples
Newsletter to 10,000 subscribers
150 bounces leave 9,850 delivered. 3,200 opens is a 32.5% open rate and 300 clicks a 3.05% CTR; 300 ÷ 3,200 gives a 9.4% click-to-open rate. 25 orders from 300 clicks is 8.3%, and $1,500 revenue is about $0.15 per delivered email.
Large promotional blast
48,800 of 50,000 are delivered (2.4% bounce rate, a warning sign). Opens of 9,800 give a 20.1% open rate and 1,150 clicks a 2.36% CTR, or 11.7% of openers. 30 complaints is 0.06%, still under Gmail’s 0.1% guidance.
Small, engaged B2B list
2,480 delivered with 1,100 opens (44.4%) and 180 clicks (7.26% CTR, 16.4% CTOR). Revenue of $960 works out to about $0.39 per delivered email.
Frequently asked questions
What is a good email open rate?+
Many industry benchmarks put average open rates between roughly 20% and 40%, but Apple Mail Privacy Protection inflates opens for many lists. Compare against your own history and give more weight to click rate and CTOR.
What is the difference between CTR and CTOR?+
CTR divides unique clicks by delivered emails and measures the whole campaign. CTOR divides clicks by unique opens and isolates how well the content and call to action persuaded people who opened.
What spam complaint rate is acceptable?+
Google’s sender guidelines ask bulk senders to keep the spam rate reported in Postmaster Tools below 0.1% and never reach 0.3%. Yahoo applies a similar 0.3% threshold.
Should open rate use sent or delivered emails?+
Most email platforms divide by delivered emails (sent minus bounces), which this calculator uses. Dividing by sent gives a slightly lower number, so be consistent when comparing reports.
What is a normal unsubscribe rate?+
Unsubscribe rates are commonly well under 0.5% per campaign. Sustained higher rates suggest you are sending too often or the content no longer matches what subscribers signed up for.