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Marketing · Lesson 5 of 6

Startup Funnel Metrics: Measure the Step That Matters

Calculate a simple funnel and separate conversion, retention and acquisition cost.

20 min · Free · no sign-up

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What you will learn

Use explicit denominators

If 12 of 200 visitors begin a trial, visitor-to-trial conversion is 6%. If three of those trials become customers, trial-to-customer conversion is 25%, while visitor-to-customer conversion is 1.5%. Label the stage and period.

Count the cost of learning

Cash acquisition cost is campaign spend divided by acquired customers. Founder time is not free: estimate it separately and make the hourly assumption visible. With zero customers, cost per customer is undefined, not zero.

Check what happens after signup

A first conversion does not prove ongoing value. Measure a useful activation event and later repeat use within a clear cohort. Avoid mixing this month’s traffic with customers acquired months earlier.

An example

A campaign reaches 200 visitors, produces 12 trials and three customers, with $60 cash spend. Cash cost per customer is $20. Four hours of work valued at $25/hour would add $100, making the fully allocated estimate $53.33 per customer.

The trap to avoid

Do not call a channel profitable without considering gross margin, delivery costs, retention and the full acquisition effort.

Try it: the exercise

Answer these three prompts. In the Equip learning desk your answers are saved in your browser, with a checklist to review them.

  1. Your funnel definitionName each stage, the cohort and the measurement period.
  2. Observed counts or a labelled scenarioRecord visits, trials, customers, spend and effort. Mark synthetic numbers.
  3. Your next diagnostic questionWhich step needs investigation, and what further evidence would help?

A good answer has

  • Counts use the same cohort and period
  • Correct denominators
  • Costs and assumptions visible
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Check yourself

200 visitors produce 12 trials and 3 customers. Trial-to-customer conversion is…
  1. 1.5%
  2. 6%
  3. 25%

Answer: C. Three divided by twelve is 25%. The other rates use visitors as the denominator.

$60 spent, zero customers. Cash cost per customer is…
  1. $0
  2. Undefined; no customers were acquired.
  3. $60 exactly.

Answer: B. Dividing by zero does not produce a meaningful acquisition cost. Show no customers and investigate the failed conversion.

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