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About this tool
Calculate open, click, click-to-open, bounce, unsubscribe and complaint rates on the correct denominators, with a privacy-proxy adjustment.
Newsletter Open Rate Calculator converts raw campaign counts into the six rates that matter — open, click, click-to-open, bounce, unsubscribe and spam complaint — each on the denominator the industry actually uses. Engagement rates are measured against delivered mail, which is sent minus bounces, while the bounce rate itself is measured against sent; mixing the two is the most common reporting mistake. It also produces an adjusted open rate with privacy-proxy opens removed, because pixel tracking counts prefetches as reads.
Open Newsletter Open Rate Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Every rate states the base it uses, so open and click rates are comparable across platforms.
Enter machine opens and get a second open rate that reflects human reads.
Flags a bounce rate above 2% and a complaint rate above 0.1%, the levels that put sending reputation at risk.
Divide unique opens by delivered emails and multiply by 100. Delivered means sent minus bounces, so 4,100 opens from 11,820 delivered is 34.69%. Using sent instead of delivered understates the rate.
Apple Mail Privacy Protection began pre-fetching tracking pixels for users who enable it, registering an open whether or not the message was read. Any pixel-based open rate since then is inflated by an unknown share, which is why click and click-to-open rates are more reliable.
Click rate is unique clicks divided by delivered emails; click-to-open rate is unique clicks divided by unique opens. Click rate measures the campaign end to end, while click-to-open isolates how persuasive the content was for people who actually opened it.
Mailbox providers generally treat complaints above 0.1% of delivered mail as a warning sign and 0.3% as severe enough to affect delivery. Bounce rates above about 2% point to list hygiene problems and should be cleared before the next send.
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