Level: Intermediate
Blended CAC across all channels combined hides real differences in efficiency; calculating it channel by channel reveals where your budget is actually working hardest.
Isolate Spend and Conversions per Channel
Accurate channel-level CAC depends on clean, channel-specific tracking — without it, you're left estimating rather than measuring.
Compare Channel CAC Against Channel-Specific LTV
A channel with a higher CAC isn't necessarily worse if it also reliably brings in higher-value, longer-retained customers.
Watch for Overlap Between Channels
A customer influenced by several channels before converting can complicate clean, isolated CAC calculations, which is where attribution modeling becomes relevant.
Next step: Use the Sales Letter Writer to when a channel shows a high CAC, check the creative running there before assuming the channel itself is the problem — often it's the ad, not the audience, driving the inefficiency.