Marketing Performance.

How These Numbers Fit Together

Marketing measurement goes wrong in a predictable way: each metric gets reported on its own, looks acceptable on its own, and hides a problem that only appears when you put them side by side. Conversion rate, cost of acquisition and return on spend are three views of the same funnel, and any one of them read alone will mislead you.

Conversion rate tells you about the funnel, not the business

A rising conversion rate feels like progress, but it is a ratio — and ratios improve when the denominator shrinks. Cutting a broad campaign will often lift conversion rate sharply while total conversions fall, because what remains is your warmest traffic. That is not an improvement in marketing; it is a smaller funnel. Always read conversion rate next to the absolute number of conversions.

CAC is meaningless without knowing what a customer is worth

A $200 acquisition cost is excellent for a business whose customers stay three years and ruinous for one selling a single $80 item. The number that matters is the ratio of lifetime value to acquisition cost. A widely used benchmark for subscription businesses is roughly 3:1 — below that, growth consumes more cash than it generates; far above it, you are probably underinvesting and leaving demand unserved.

ROAS and ROI are not interchangeable

Return on ad spend divides revenue by advertising cost. Return on investment divides profit by total cost. A campaign at 4× ROAS sounds healthy, but if your gross margin is 20% then every $100 of ad spend returns $400 of revenue and only $80 of gross profit — a loss before anyone has been paid. The rule of thumb worth remembering: your break-even ROAS is 1 divided by your gross margin. At a 25% margin you need 4× just to stand still.

Attribution changes the answer

Every figure above depends on which touchpoint gets credit for a sale. Last-click attribution flatters search and starves the awareness channels that created the demand search captured. Platform-reported figures are usually the most generous, since each platform counts conversions it influenced by its own definition — which is why summing conversions across ad accounts routinely exceeds the number of orders the business actually took. Reconcile against your own order data before trusting any of it.