The three questions every DTC founder should be able to answer from memory (most cannot)
When we start working with a new DTC client, there are three questions we ask in the first session. We ask them before opening any dashboards or looking at any data. We ask them from memory.
The answers — and more often the inability to answer — tell us almost everything we need to know about where the business’s growth constraints are.
QUESTION 1: WHAT IS YOUR BLENDED CAC?
“Total marketing spend divided by new customers acquired this month. Not this year, not blended over six months. This month.”
Approximately 60% of founders who have a growing, revenue-generating DTC business cannot answer this question with any precision when asked cold. They can produce a ROAS figure from memory. They can name their best-performing creative. But the specific relationship between what was spent and how many new customers came in this month — calculated correctly, using new customers rather than total orders — is not a number they are tracking.
Why it matters: CAC is the central metric of acquisition economics. Everything downstream — maximum viable spend, channel prioritisation, the decision to scale or pause — depends on it. A founder who does not know their CAC monthly cannot know whether their acquisition model is sustainable.
QUESTION 2: WHAT IS YOUR FIRST-TO-SECOND PURCHASE RATE AT 90 DAYS?
“Of the customers who made their first purchase with you three months ago, what percentage have now bought a second time?”
This question is almost universally unanswerable from memory. Most founders know their overall repeat purchase rate approximately — the annual figure visible in Shopify Analytics. The cohort-specific 90-day rate requires a different analysis: taking a specific monthly cohort of first-time buyers and tracking how many have returned.
Why it matters: this is the leading indicator of LTV trajectory, the direct measure of whether the post-purchase experience is working, and the primary input to the retention investment decision. A brand that does not know this number cannot evaluate whether its retention system is working or whether it needs investment.
QUESTION 3: WHAT PERCENTAGE OF YOUR REVENUE CAME FROM EMAIL LAST MONTH?
Not last year. Not on average. Last month specifically.
This one lands better — more founders know their email revenue contribution. But the precision matters. “About 15 to 20 per cent” is less useful than “18.3 per cent in April, up from 14.1 per cent in March — we added the browse abandonment flow last month and attribute most of the improvement to that.”
Why it matters: email revenue percentage is the simplest measure of whether the retention infrastructure is working. Below 15%: significant flow gaps or segmentation problems. Above 25%: a functioning retention system. Tracking it monthly — specifically, not approximately — is the accountability mechanism that ensures the number is improving rather than stagnating.
THE IMPLICATION
These three numbers — CAC, first-to-second purchase rate, email revenue share — are the minimum viable information set for running a DTC business with financial clarity.
They are not hard to track. All three are available in Shopify and Klaviyo with minimal setup. The barrier is not technical — it is the habit of looking for them regularly and keeping them current.
A founder who can answer all three from memory has built the review discipline that makes growth decisions clear. The numbers change what gets prioritised, what gets invested in, and what gets paused.
A founder who cannot answer any of them is making growth decisions in the dark — relying on instinct, on platform dashboard figures that are imprecise, and on the loudest voices in the room rather than on the data that would make the right answer obvious.