Unsubscribe Rate Calculator

The Unsubscribe Rate Calculator turns a campaign's delivered count and opt-out count into the unsubscribe rate every ESP dashboard reports — and, if you also know your list size, the subscriber loss rate and remaining subscriber count too.

The formulas

Unsubscribe Rate %     = Unsubscribes ÷ Emails Delivered × 100
Subscriber Loss Rate % = Unsubscribes ÷ Starting Subscribers × 100
Remaining Subscribers  = Starting Subscribers − Unsubscribes

Unsubscribe rate answers "how many people who received this campaign opted out?" — it's the number most email platforms show you per-send. Subscriber loss rate answers a different question: "how much of my whole list did this one campaign cost me?" A list of 500,000 losing 48 subscribers barely moves the needle even at a 5% unsubscribe rate on a small segment send; the two rates only diverge when your campaign didn't go to your entire list.

How to use it

1. Enter Emails Delivered — messages that actually landed in an inbox for this campaign (exclude bounces).
2. Enter Unsubscribes — how many recipients opted out after this send.
3. Optionally enter Subscriber List Size (Before) — your total list size before the campaign. This unlocks the subscriber loss rate and the remaining-subscriber count; leave it blank if you only care about the per-campaign rate.

Results update instantly as you type.

What's a healthy unsubscribe rate?

Most senders see unsubscribe rates well under 0.5% per campaign. Rates creeping past 1–2% usually mean a mismatch between what was promised at signup and what's being sent, sending too frequently, or a list that's gone stale — all worth investigating before it drags down sender reputation and deliverability.

Privacy

All calculations run entirely in your browser. Your subscriber counts are never uploaded or stored.