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Unsubscribe Rate Calculator

Work out unsubscribe rate instantly with clear inputs, formula shown and shareable results.

About Unsubscribe Rate Calculator

A per-campaign unsubscribe rate looks tiny until it is compounded across sending frequency. At four campaigns a month even a 0.4% rate erodes a fifth of the list within a year, which sets the minimum acquisition rate needed.

Formula

List decay

Decay over k sends = 1 - (1 - rate)^k

Worked example

With the default values below, Unsubscribe Rate Calculator returns Unsubscribe Rate Per Campaign of 0.4146%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Unsubscribesaccepts 0–100,000,000
340
Emails Deliveredaccepts 1–100,000,000
82,000
Campaigns Per Monthaccepts 1–60
4

Results

Unsubscribe Rate Per Campaign
0.4146%
Unsubscribes Per Thousand Delivered
4.146 per 1,000
List Decay Per Month
1.648%
List Decay Per Year
18.081%

Step by step

  1. 1Values used
  2. 2List decay
  3. 3Unsubscribe Rate Per Campaign= 0.4146
  4. 4Unsubscribes Per Thousand Delivered= 4.146 per 1,000
  5. 5List Decay Per Month= 1.648
  6. 6List Decay Per Year= 18.081

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Figures are estimates based on the inputs given. Marketing performance, platform fees and conversion behaviour vary by audience, channel and season. Use this as a planning guide, not a forecast.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Figures are estimates based on the inputs given. Marketing performance, platform fees and conversion behaviour vary by audience, channel and season. Use this as a planning guide, not a forecast.

Frequently Asked Questions

What rate is acceptable?

Under 0.2% per campaign is healthy; above 0.5% suggests frequency or relevance problems.

Does more frequent sending help or hurt?

It raises total volume but compounds unsubscribes, so the net effect depends on whether content justifies the cadence.

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