The marketing metric that actually matters - and the ones that are lying to you

I'm going to say something that will make some marketers uncomfortable.

Most marketing dashboards are works of fiction.

Not deliberate fiction. Nobody is sitting there making numbers up. But they're built to show activity rather than impact, and there's a significant difference between the two. Impressions, reach, engagement rate, share of voice, brand sentiment. All of these can be going in the right direction while your business is standing completely still.

I've sat in board meetings where marketing presented a deck full of green arrows and the CEO still had the same question at the end of it: "So what did marketing actually do for revenue this quarter?" And the honest answer, which nobody wanted to say out loud, was: we don't fully know.

That's a problem. Not just for the marketing team's credibility, but for the business. Because if you can't connect your marketing activity to commercial outcomes, you can't make good decisions about where to invest, what to cut, and what to scale.

So what's the metric that actually matters?

It depends on your business model, but in most cases it comes down to some version of the same question: what did a customer cost to acquire, what are they worth over their lifetime, and does the maths work? Everything else is context for answering that question better.

At Just Group I built a marketing data capability from the ground up specifically because we needed to answer that question across multiple channels and product lines. It wasn't glamorous work. It involved getting the CDO and the marketing team in the same room, building the data infrastructure, and being honest about the fact that some of what we were doing couldn't be measured yet, so we needed to fix that before we could make confident investment decisions.

The result was a marketing automation engine that let us track conversion at every stage, attribute revenue to specific channels and campaigns, and make decisions based on what was actually working rather than what looked good on a slide.

Here's what I'd suggest if you're not there yet. Start by identifying the two or three numbers that your CEO or board actually care about. Revenue contribution, cost per acquisition, pipeline generated, market share; pick the ones that matter in your business. Then work backwards from those to understand what marketing activity genuinely influences them. Build your reporting around that connection, and be honest about the gaps.

A dashboard with three meaningful metrics is worth more than twenty vanity ones. The businesses that figure that out earlier tend to spend their marketing budget better, justify it more confidently, and grow faster as a result.

The ones that don't keep presenting green arrows and hoping nobody asks the hard question.

Eventually, someone always does.

Gareth Foster is the founder of crowd. - fractional CMO and marketing consultancy services for businesses that need senior marketing leadership without the full-time overhead. If something here struck a chord, book a free 30-minute call and let's figure out whether we can help.