# Email Unsubscribe Rate Calculator

> Calculate the unsubscribe rate of an email send as unsubscribes divided by emails delivered, and unsubscribes per 1,000 delivered.

Category: Marketing analytics · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/email-unsubscribe-rate-calculator

Unsubscribe rate is the share of delivered emails that led the recipient to opt out: unsubscribes divided by emails delivered, times 100.

Also called: Opt-out rate calculator.

## Inputs
- Emails delivered (default 12500)
- Unsubscribes (default 25)

## Results
- Unsubscribe rate
- Unsubscribes per 1,000 delivered

## Formula

```
Unsubscribe rate = Unsubscribes ÷ Delivered × 100;  Per 1,000 = Unsubscribes ÷ Delivered × 1,000
```

Where:
- Delivered: emails that reached the receiving server (the denominator)
- Unsubscribes: opt-outs attributed to this send

## Worked example
1. Unsubscribe rate = 25 ÷ 12,500 × 100 = 0.2%.
2. Per 1,000 = 25 ÷ 12,500 × 1,000 = 2.

**Result:** 25 unsubscribes from 12,500 delivered emails is a 0.2% unsubscribe rate, 2 per thousand.

## What the result means

Watch the trend per campaign type rather than a single number. A spike after a particular send often means the frequency, the content or the audience was off.

## Assumptions and limits
- Unsubscribes are counted against the send that prompted them.
- Spam complaints are a separate, more damaging signal and are not included here.

## Questions

### Why divide by delivered rather than sent?

Bounced emails were never received, so their recipients could not unsubscribe. Dividing by sent would understate the rate.

## Related calculators
- [Email Subscriber Growth Calculator](https://calculators.geekmidst.com/calculators/email-subscriber-growth-calculator)
- [Email Bounce Rate Calculator](https://calculators.geekmidst.com/calculators/email-bounce-rate-calculator)
- [Email Click-to-Open Rate Calculator](https://calculators.geekmidst.com/calculators/email-click-to-open-rate-calculator)
- [Percentage Calculator](https://calculators.geekmidst.com/calculators/percentage-calculator)

Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/email-unsubscribe-rate-calculator