Email Open Rate Calculator

How to calculate your open rate

Open rate is unique opens divided by emails delivered, multiplied by 100. The common mistake is dividing by emails sent: bounced emails were never seen by anyone, so they don't belong in the denominator. This calculator subtracts your bounces first, then works out open, reply and click rates from the same delivered number.

Take open rates with a grain of salt

Here's what most open rate calculators won't tell you: the number you just calculated is an estimate, not a measurement. Open tracking works by hiding a one-pixel image in your email and counting how many times it loads, and that mechanism breaks in both directions. Apple Mail Privacy Protection pre-loads tracking pixels for its users whether they open the email or not, and corporate security software does the same when it scans inbound mail, so both inflate your count. Meanwhile recipients who block remote images read your email without registering anything.

For cold email there's a second problem: the tracking pixel itself can hurt the deliverability it's supposed to measure. Spam filters associate tracking pixels with bulk mail, and Gmail can show a warning on tracked messages, the opposite of the personal, one-to-one impression a cold email needs to make. This is why Emailchaser is built around reply rate rather than open rate: a reply is a real event that can't be faked by a mail client, and it's the metric that actually correlates with booked meetings and closed deals.

None of this makes the calculator useless. Open rate is still a rough directional signal, a collapse from one campaign to the next hints at a deliverability or subject-line problem worth investigating. Just don't optimize for it, and don't trust small differences.

What's a good cold email open rate?

With those caveats in place, the only benchmark we quote is Woodpecker's 2026 platform data, collected on our cold email statistics page: average open rates between 27.7% and 44%, with 40 to 60% called good. Consistently sitting well below that range usually means something is wrong, a stale list, a spammy subject line, or emails landing in the spam folder. Reply rate is the more meaningful number, and the same source puts the average at 3.43% with 5 to 10% called good.

If your rates need work, start with list quality. Verifying addresses before you send keeps bounces low, and low bounces protect the sender reputation that gets your emails seen in the first place.