Your agency sends 12 metrics every month. Here are the 6 that connect to revenue — and the ones that sound important but tell you almost nothing about business outcomes.
Most marketing reports are designed to look impressive. They're full of numbers — reach, impressions, engagement rate, click-through rate, follower growth — that generate charts and fill slides. What most of those numbers don't do is tell you whether your marketing is actually generating revenue.
This is the full metrics stack for performance marketing: the six numbers that connect directly to business outcomes, how to calculate each one correctly, what a healthy benchmark looks like, and the metrics that are commonly reported but rarely meaningful.
The average cost to acquire one paying customer, calculated across all marketing spend. Formula: Total Marketing Spend ÷ New Customers Acquired in the same period.
Calculate this both blended (across all channels) and by channel. Blended CAC tells you the overall health of your marketing. Channel-specific CAC tells you which acquisition sources are efficient and which are draining budget. A blended CAC of $500 could mean paid search at $200 and paid social at $800 — two very different situations requiring different responses.
Healthy benchmark: varies dramatically by industry and business model. The key ratio is CAC versus LTV. A blended CAC that is less than one-third of LTV (a 3:1 LTV:CAC ratio) is the widely cited threshold for a sustainable growth model.
The total revenue generated by a customer over the full span of their relationship with your business. For subscription businesses: Average Monthly Revenue Per Customer × Average Customer Lifespan in months. For transactional businesses: Average Order Value × Average Purchase Frequency × Average Customer Lifespan.
LTV is the denominator that determines whether your CAC makes sense. Without it, every CAC number is meaningless. High LTV businesses can sustain high CAC. Low LTV businesses cannot. This is why comparing CAC across industries without normalizing for LTV produces misleading benchmarks.
The ratio of lifetime customer value to acquisition cost. The most important single indicator of growth model health. Formula: LTV ÷ CAC.
3:1 is the broadly accepted minimum for a sustainable SaaS or subscription business. Below 3:1 means you're spending too much to acquire customers relative to what they're worth. Above 5:1 often means you're under-investing in growth — you have room to spend more and still build a profitable business. Optimize for 3:1 to 4:1 as a target range.
How long it takes to recover your customer acquisition cost through the revenue a customer generates. Formula: CAC ÷ Average Monthly Revenue Per Customer.
For subscription businesses, a payback period under 12 months is generally healthy. 12–18 months is manageable with sufficient capital. Above 18 months creates cash flow constraints that limit how fast you can grow, because you're funding customer acquisition for 18 months before breaking even on each customer. For transactional businesses, payback period should be calculated against gross margin, not revenue.
Revenue generated per dollar of advertising spend. Formula: Revenue from Ads ÷ Cost of Ads. Expressed as a multiple (4x) or a percentage (400%).
ROAS is the most commonly reported metric in paid media and one of the most commonly misused. The key caveat: ROAS doesn't account for margins. A ROAS of 4x with 20% gross margins means you're generating $0.80 in gross profit per dollar of ad spend — which after platform fees, agency fees, and overhead is often unprofitable. Calculate your break-even ROAS (1 ÷ Gross Margin %) and treat any ROAS below that number as a business problem, not a media success.
The revenue generated by a customer minus the variable costs of acquiring and serving them, expressed as a dollar amount. This is the number that tells you whether growth is actually adding value to the business or consuming capital faster than it creates it.
Formula: Customer Revenue − Cost of Goods Sold − CAC − Variable Servicing Costs = Contribution Margin. Positive contribution margin at the unit level is the prerequisite for scalable growth. Scaling a business with negative contribution margin just scales the losses.
Impressions and reach tell you how many people potentially saw your content. They're useful as inputs to CPM calculations but not as performance indicators. A campaign with 1,000,000 impressions that generated no clicks or conversions performed worse than a campaign with 10,000 impressions that generated 100 leads.
Engagement rate tells you how many people interacted with your content relative to how many saw it. Useful for creative performance benchmarking. Not a business metric.
Follower growth tells you how many people chose to follow your account. Not meaningfully correlated with revenue in most contexts. A company with 50,000 followers and no email list is worse off than a company with 500 followers and a 2,000-person email list of qualified buyers.
Click-through rate (CTR) tells you what percentage of people who saw your ad clicked it. Useful for diagnosing creative performance. Not a business metric — a high CTR on an ad driving to a broken landing page generates clicks and nothing else.
If your agency's monthly report leads with impressions and reach, ask them to rebuild the report around CAC, LTV, and ROAS against your break-even target. If they can't do that, they either don't have the attribution infrastructure to produce those numbers (a fixable infrastructure problem) or they're reporting on activity because the outcomes aren't strong enough to report on (a different problem).
The metrics you track are the metrics you optimize for. If you measure impressions, your agency will optimize for impressions. If you measure contribution margin, they'll optimize for contribution margin. The report design is not a neutral document — it shapes where attention goes.
CAC: Total Marketing Spend ÷ New Customers. Target: less than 1/3 of LTV. LTV: Average Revenue Per Customer × Lifespan. No universal target — must be 3x+ CAC. LTV:CAC: LTV ÷ CAC. Target range: 3:1 to 4:1. Payback Period: CAC ÷ Monthly Revenue Per Customer. Target: under 12 months for subscription. ROAS: Ad Revenue ÷ Ad Spend. Must exceed 1 ÷ Gross Margin to be profitable. Contribution Margin: Revenue − COGS − CAC − Variable Costs. Must be positive for scalable growth.
Impressions and reach: useful for CPM benchmarking, not performance. Engagement rate: creative benchmarking only. Follower count: vanity metric in most contexts. CTR: creative diagnostic, not business outcome. Time on page: content quality signal, not pipeline signal.
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