Term
CPO (Cost per Order)
Advertising KPI: cost per order. Standard efficiency metric in e-commerce, where an order is the typical conversion.
CPO (Cost per Order) — in more detail
CPO stands for “Cost per Order” — the e-commerce variant of CPA, measuring the average ad spend required to produce one order. Formula: total cost ÷ number of orders. Unlike CPA in lead gen, downstream qualification is weaker — the order is the conversion. CPO becomes meaningful in relation to Average Order Value (AOV) and margin: a CPO of €20 on an AOV of €80 with 30 % margin means €24 contribution minus €20 ad spend = €4 per order — thin buffer, but positive.
Example / In practice
A fashion store reports €6,000 spend on 300 orders → CPO €20. At an AOV of €90, that maps to a cost-of-revenue ratio of 22 % or a ROAS of 4.5. POAS (profit-based) tells a different story per margin class — sale items at 15 % margin are critical, full-price items at 50 % are comfortable.
Distinction from similar terms
CPA is the umbrella for any conversion type; CPO is specifically the order. AOV is the counterpart KPI — CPO over AOV gives cost-of-revenue ratio. ROAS measures revenue, POAS measures margin.
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CPA (Cost per Acquisition)
Advertising KPI: average cost per conversion. Central efficiency metric for lead gen and performance marketing, and the steering input for tCPA bidding.
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