Marketing Metrics That Matter: What to Track by Funnel Stage
You can measure almost anything in marketing, which is exactly the problem. Dashboards fill up with numbers that go up and to the right and make everyone feel good, while the few figures that actually tell you whether the business is working get buried.
This guide cuts the list down. We'll separate vanity metrics from actionable metrics, then walk the marketing funnel stage by stage and name the handful of numbers worth tracking at each point — what they mean, the rough formulas, and how they connect. There's also a conversion-rate calculator below so you can try the maths on your own figures.
- A metric matters only if it changes a decision. If a number going up or down wouldn't make you do anything differently, it's probably vanity.
- Track by funnel stage: awareness, acquisition, conversion and retention each have their own signals.
- CAC and LTV are the pair that decides viability — what a customer costs to win versus what they're worth.
- ROAS and conversion rate tell you whether spend and pages are pulling their weight.
- Retention is the cheapest growth lever and the metric beginners most often ignore.
Vanity vs actionable metrics
A vanity metric is one that looks impressive but doesn't inform a decision. Raw page views, total followers, "impressions" and email list size all fall here when reported alone — they can climb while revenue flatlines. An actionable metric ties to behaviour and money, and ideally can be broken down so you can act: not "10,000 visits" but "checkout conversion rate fell from 3.1% to 2.4% after the redesign."
The test is simple: if this number doubled overnight, would I change what I'm doing? If not, it's a vanity metric — interesting at best, distracting at worst.
Vanity metrics aren't useless; trends in reach can be early signals. The danger is optimising for them. The framing of actionable versus vanity metrics is well covered in the lean-analytics literature, including Eric Ries's writing on the topic in The Lean Startup.
The metrics by funnel stage
Mapping metrics to the funnel keeps you honest about what each one measures. A click-through rate tells you nothing about retention; lifetime value tells you nothing about whether your ads get noticed. Match the metric to the question.
Awareness & acquisition. Here you watch reach, click-through rate (CTR) — clicks divided by impressions — and cost per lead (CPL). These tell you whether you're getting noticed and bringing the right people in at a sustainable cost.
Conversion & retention. Here you watch conversion rate (CVR), return on ad spend (ROAS), customer acquisition cost (CAC), lifetime value (LTV) and churn/retention. These tell you whether the business actually works.
CAC, CPL and CTR
CTR measures attention: of everyone who saw your ad, email or listing, what share clicked? It's diagnostic — a low CTR usually points at weak messaging or poor targeting. CPL (cost per lead) is total spend divided by leads generated, and tells you what each potential customer costs to attract.
CAC (customer acquisition cost) is the headline acquisition metric: total sales and marketing cost divided by the number of new customers won in that period. Not leads — customers. CAC is only meaningful next to what a customer is worth, which brings us to the most important pairing in marketing.
| Metric | Rough formula | Answers |
|---|---|---|
| CTR | Clicks ÷ Impressions | Is the message getting attention? |
| CPL | Spend ÷ Leads | What does a lead cost? |
| CAC | Sales & marketing cost ÷ New customers | What does a customer cost? |
| CVR | Conversions ÷ Visits | Is the page persuading? |
| ROAS | Revenue from ads ÷ Ad spend | Is the spend paying back? |
| LTV | Avg value × lifespan (simplified) | What is a customer worth? |
CAC and LTV: the pair that decides viability
If you track only two numbers, track these. LTV (customer lifetime value) estimates the total revenue a customer brings over their relationship with you. A simple version multiplies average purchase value by how often they buy and for how long. The relationship between LTV and CAC tells you whether your model holds: if it costs more to win a customer than they'll ever be worth, no amount of clever marketing fixes that.
A common rule of thumb in subscription businesses is an LTV roughly three times CAC, with CAC ideally recovered within about a year — but treat any benchmark as a starting point, not a law, since healthy ratios vary by industry and margin. The point isn't the magic number; it's that you compute both and watch the gap.
Conversion rate and ROAS
Conversion rate is the percentage of visitors who take the action you want — buy, sign up, submit a form. It's the lever that quietly multiplies everything else: lifting CVR makes every visit, every click and every ad dollar more productive without spending more. Try it with your own numbers:
Conversion rate calculator
ROAS (return on ad spend) is revenue attributable to advertising divided by what you spent on it. A ROAS of 4 means four units of revenue for every one spent. Unlike CTR, ROAS connects directly to money — it's how you judge whether a campaign earns its place. Pair it with CAC: high ROAS with rising CAC can still mean trouble if you're buying low-value customers. Google's guidance on measuring conversions and ROAS explains how the tracking side fits together.
Retention: the metric beginners ignore
Retention (and its mirror, churn) measures whether customers stick around. It's the cheapest growth lever there is, because keeping an existing customer typically costs a fraction of winning a new one, and retained customers raise LTV directly. Yet beginners pour everything into acquisition and never look at the leaky bucket behind them.
Track the share of customers who remain active over a period, or repeat-purchase rate for ecommerce. Even small improvements compound: research popularised by Bain & Company's Fred Reichheld has long argued that modest increases in retention can produce outsized profit gains. Before scaling spend, ask whether you're keeping the customers you already paid to acquire.
- Picked 4–6 metrics, one or two per funnel stage
- Calculated CAC for your most recent period
- Estimated LTV and compared it to CAC
- Set up conversion tracking so CVR and ROAS are real, not guessed
- Added a retention or repeat-purchase metric
- Removed at least one vanity metric from your main dashboard
Common questions
How many metrics should I actually track?
Fewer than you think. A focused dashboard of four to six metrics that map to your funnel beats a wall of fifty. You can always dig into supporting numbers when something moves; the headline set should fit on one screen.
Are page views and followers useless?
Not useless, but rarely decision-grade on their own. Treat them as supporting context for reach, not as goals. The moment a team starts optimising for follower count or raw views, it usually drifts away from revenue.
How do I calculate LTV if I'm just starting out?
Use a simple estimate at first: average order value multiplied by average purchase frequency and expected customer lifespan. It won't be precise, but it's enough to compare against CAC and sanity-check your model. Refine the formula as you gather real data.
Which metric matters most?
There's no single answer — it depends on your stage. Early on, conversion rate and CAC reveal whether the basics work. As you grow, LTV and retention decide whether growth is profitable. The right metric is the one tied to the decision in front of you.
Where to go next
Metrics are only as good as the tracking behind them. Set up measurement with our Google Analytics 4 basics, learn to lift the most leveraged number in conversion rate optimization basics, and see how the stages fit together in the marketing funnel explainer.