The four marketing metrics that actually matter to an SME

Marketing reports often run to many pages without answering the question that matters. These are the four numbers that decide whether marketing is working.

1. Cost per lead

Total marketing spend — including agency fees, not just media — divided by qualified enquiries. Including the fees is what makes it honest. An agency reporting cost per lead on media spend alone is reporting a number that flatters itself.

Track it by channel. Blended CPL hides that one channel is subsidising another.

2. Lead-to-customer rate

Of the enquiries generated, what proportion become paying customers? This is the number that tells you whether a channel produces the right leads or merely a lot of them.

A channel with a £40 CPL converting at 5% costs £800 per customer. A channel with a £120 CPL converting at 30% costs £400. The second is twice as good and looks three times worse in a report that stops at cost per lead. This is the single most common misreading we encounter.

3. Customer acquisition cost

Cost per lead divided by lead-to-customer rate. The number that matters against your margin.

If your average customer is worth £2,000 in gross profit over their lifetime and CAC is £400, marketing is working. If CAC is £1,800, it is technically profitable and practically fragile.

4. Payback period

How many months of that customer's revenue it takes to recover the acquisition cost. This is the cash-flow question, and it is the one that determines whether you can afford to grow faster.

Under three months, you can reinvest aggressively. Over twelve, growth is constrained by working capital regardless of profitability on paper.

The six to ignore

• Impressions. Not a result.
• Reach. The same, with a friendlier name.
• Engagement rate. A diagnostic for creative, not an outcome.
• Followers. Uncorrelated with revenue in almost every SME we have measured.
• Sessions, on their own. Useful as a trend, meaningless as a target.
• Keyword rankings, on their own. Position one for something nobody searches is not an achievement.

These are not worthless — they are diagnostics that explain why the four numbers moved. The failure is presenting a diagnostic as an outcome.

What you need in place

None of this is measurable without conversion tracking, a CRM that records source, and the discipline to mark deals won and lost. Most businesses we audit have none of the three, which is why their reporting stops at sessions.

Fixing that is usually the first month's work, and it is worth more than anything else that could be done with the same time.