Cost per retained newsletter referral calculator

Worked example

• Referral campaign cost: 120 USD
• Retained referrals at the cutoff: 30

Cost per retained reader · $4.00

How to interpret the result

Follow the original group through a fixed window. Include amounts actually paid after adjustments.

Publisher example

A $300 campaign leaves 75 readers at the cutoff, for $4 per retained reader. Compare offers at the same cutoff even if their invoices closed on different days.

Related reading: beehiiv failed referral verification: billing and subscriber removal are separate