Newsletter subscriber acquisition cost calculator
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Worked example
- Campaign cost: 240 USD
- Verified new subscribers: 120
Cost per verified subscriber · $2.00
See the formula
Campaign cost ÷ Verified new subscribers.
How to interpret the result
Use verified signups from the campaign. Keep later retention separate unless you specifically want cost per retained reader.
Publisher example
A $450 campaign brings 150 verified subscribers, or $3 each. If 90 remain after the first month, the cost per retained subscriber is $5.
Related reading: SparkLoop referrals: why a qualified referral may still go unpaid