Measuring acquisition cost
One spend figure.
Three very different costs.
A practical guide to separating cost per enquiry, cost per qualified lead and cost per customer. Define the denominator before judging the result.
Start with the event you are counting.
An enquiry is an initial response. A qualified lead meets agreed criteria. A customer has reached the business’s defined purchase state. These counts represent different progress through the journey and should not share an ambiguous label called conversions.
Choose one period and document how each record enters it. Cohort-based progression and calendar-period totals can produce different pictures when sales take time.
Calculate each measure explicitly.
| Measure | Calculation |
|---|---|
| Cost per enquiry | Included spend ÷ enquiries |
| Cost per qualified lead | Included spend ÷ qualified leads |
| Cost per customer | Included spend ÷ customers |
A worked example, not a benchmark.
Suppose a hypothetical campaign has 10,000 in included spend, 100 enquiries, 25 qualified leads and 5 customers. The three costs are 100, 400 and 2,000 in the same currency. No conversion between currencies is involved.
The example illustrates arithmetic only. It says nothing about an appropriate target for a particular industry or business.
Decide what belongs in spend.
Media-only cost and fully loaded acquisition cost are different measures. State whether creative, agency, sales and tooling costs are included. Compare like with like, and avoid calling media cost per customer your complete customer-acquisition cost when it excludes relevant expenditure.
Check the counts before reading the trend.
- Remove or separately label duplicate and invalid records according to an agreed rule.
- Apply the same qualification criteria across the comparison.
- Allow for sales-cycle delay when judging customer progression.
- Investigate counts where qualified leads exceed enquiries or customers exceed qualified leads.
- Treat a zero denominator as an unavailable cost, not zero cost.
Turn the calculation into a decision.
A rising cost can reflect weaker demand, tighter qualification or a timing difference. Review the underlying records before changing spend. The question is which stage changed, and why.
Calculate your own costs · Read the qualification definition · Request a growth audit