The marketing cost of acquiring a single lead — typically an email subscriber, quiz completion, or contact form submission. CPL = Total Campaign Spend / Total Leads Generated.
For D2C brands focused on email list building, CPL measures the efficiency of list growth campaigns (Meta ads driving to pop-up landing pages, quiz funnels, giveaways). A sustainable CPL depends on your average email revenue per subscriber: if email generates $3.50 per subscriber per year, a CPL below $2 is profitable. Top D2C brands achieve CPLs of $0.50-1.50 via email capture pop-ups and $1.50-4.00 via paid list-building campaigns.
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