The Definitive Guide to Digital Marketing Metrics

The total cost to acquire one new customer, including all sales and marketing expenses — ad spend, salaries, tools, commissions, and overhead — divided by the number of new customers acquired in that period.

The total revenue or profit expected from a single customer across their entire relationship with the business, factoring in repeat purchases, upsells, and retention duration.

Measures the profitability of marketing investments by comparing revenue generated to costs incurred.

Determines how conversion credit is distributed across marketing touchpoints. The right model depends on sales cycle length, channel complexity, and data volume.

Measures total revenue relative to total ad spend across all channels combined. Unlike channel-specific ROAS, it provides a single, holistic efficiency metric — increasingly important as iOS privacy changes and cookie deprecation degrade platform-reported attribution.

The number of visitors arriving via unpaid search engine results — the primary indicator of SEO success.

The percentage of users who see your SERP listing and click through to your site.

The position at which your pages appear in SERPs for target keywords, tracked across devices, locations, and search features.

Third-party scores (0–100, logarithmic) from Moz (DA) and Ahrefs (DR) estimating a domain’s ranking potential. Neither is a Google ranking factor — they are proxy metrics for competitive benchmarking.

A collection of metrics describing the quantity, quality, and health of all inbound links: total backlinks, referring domains, dofollow/nofollow ratio, anchor text distribution, Trust Flow, link velocity, and toxic link percentage.

The percentage of organic visitors who complete a desired action (purchase, signup, lead form submission).

Google’s user experience metrics measuring load performance (LCP), interactivity (INP), and visual stability (CLS). These are confirmed ranking signals.

The percentage of single-page sessions where users leave without further interaction. In GA4, this has been redefined as sessions that were not ‘engaged sessions’ (less than 10 seconds, no conversion, no second pageview).

The average number of pages viewed during a single session, indicating content engagement and site navigation effectiveness.

The time a user spends on a page after clicking a search result before returning to the SERP. Not directly reported by Google but correlated with rankings.

Technical metrics tracking how effectively search engines can discover, crawl, and index your content. Monitored via Google Search Console’s Index Coverage report.

The percentage of target keywords where your content occupies the featured snippet (position zero) in search results, providing enhanced visibility and click-through.

Your website’s visibility as a percentage of total available organic traffic for your target keywords — essentially your market share of search visibility.

The percentage of ad impressions that result in clicks. A primary indicator of ad relevance and creative effectiveness.

The average amount paid each time a user clicks on your ad, determined by your bid, Quality Score, and competitive landscape.

The average cost to acquire one conversion (lead, sale, signup) through paid advertising. The metric that directly connects ad spend to business outcomes.

Revenue generated per dollar of ad spend. The primary efficiency metric for e-commerce and revenue-focused campaigns.

Google’s 1–10 rating of your keyword-level ad quality, based on expected CTR, ad relevance, and landing page experience. Higher Quality Scores reduce CPC and improve ad position.

The percentage of total available impressions your ads received. Measures how much of your potential audience you’re actually reaching, and why you’re missing the rest.

The percentage of ad clicks that result in a completed conversion action. Measures landing page and offer effectiveness.

The cost per 1,000 ad impressions. Primary pricing model for display and awareness campaigns; also useful as a secondary metric in search to understand visibility costs.

Where your ads appear on the search results page, measured by Impression (Top) % and Impression (Absolute Top) %. Replaced the deprecated ‘Average Position’ metric.

The ratio of customer lifetime value to cost per acquisition through paid channels. The ultimate PPC profitability metric that connects acquisition cost to long-term customer value.

The percentage of your audience that actively interacts with your content through likes, comments, shares, saves, and clicks.

Reach = unique users who saw content. Impressions = total times content was displayed (including repeats). The gap reveals frequency.

The rate at which your social audience is growing (or shrinking), expressed as a percentage of total followers gained in a period.

Your brand’s percentage of total social media conversations within your industry or competitive set. Measures brand awareness and conversation dominance.

The percentage of social media visitors who complete a desired conversion action on your website.

The cost for each meaningful interaction with your paid social content (like, comment, share, save, video view, or click).

The percentage of video viewers who watch your video through to completion (or to a defined threshold like 75% or 95%).

The percentage of total website traffic driven by social media channels (organic and paid combined).

The ratio of shares per post relative to your total number of followers. Measures how effectively your content extends beyond your existing audience.

The percentage of people who shared your content relative to the number of unique viewers (reach), measuring how ‘shareable’ content is among those who actually see it.

The percentage of delivered emails that are opened. Note: Apple’s Mail Privacy Protection (MPP) inflates open rates for ~50% of iOS Mail users by pre-loading tracking pixels, making this metric increasingly unreliable as a standalone measure.

The percentage of all delivered emails where a recipient clicked at least one link. The most reliable engagement metric post-Apple MPP.

The percentage of openers who clicked a link. Measures content and CTA effectiveness among engaged subscribers, isolating design/content performance from deliverability and subject line performance.

The percentage of sent emails that couldn’t be delivered. Hard bounces indicate permanent delivery failure (invalid addresses); soft bounces are temporary issues (full inbox, server down).

The percentage of email recipients who opt out of future emails after a given send.

The net growth rate of your email subscriber list, accounting for new subscribers, unsubscribes, and bounces.

The percentage of email recipients who complete the desired action (purchase, signup, download) after clicking through from an email.

The average revenue generated per email sent. The direct financial performance metric for email marketing.

The percentage of sent emails that successfully reach the recipient’s inbox (not just ‘delivered,’ which includes spam folder placement).

The percentage of email recipients who mark your email as spam/junk. The most damaging metric for sender reputation.

The percentage of email recipients who forward or share your email content with others, indicating high-value content that drives organic list growth.

Pageviews = total page loads (including repeats). Unique Visitors = distinct individuals who visit. Together they indicate content volume and audience reach.

The average amount of time users spend actively engaging with a specific page. GA4 measures ‘average engagement time’ using page visibility (only counts when the page is in the foreground and active).

Measures how far users scroll down a page, typically tracked at 25%, 50%, 75%, and 100% milestones. Reveals where content loses readers.

The percentage of content consumers who take a desired action (email signup, resource download, trial start, purchase) attributed to specific content pieces.

The financial return generated by content marketing investment, including content creation, distribution, and tool costs.

The total number of social media shares a single content piece receives across platforms, indicating content resonance and distribution effectiveness.

The number of referring domains that link to a specific content piece, measuring its authority-building and PR value.

The rate at which you produce and publish content, measured as pieces per unit of time. A production metric that impacts scaling and competitive positioning.

The percentage of total visitors who have visited your site before, indicating content loyalty and audience building effectiveness.

The percentage of ad impressions that met the viewability standard: at least 50% of the ad’s pixels visible in the browser viewport for at least 1 second (display) or 2 seconds (video).

CPM = cost per 1,000 impressions (the buying price). eCPM = effective cost per 1,000 impressions normalized across different buying models (CPC, CPA, CPV) for comparison.

The percentage of display ad impressions that result in clicks. Display CTR is significantly lower than search CTR because display ads interrupt rather than respond to intent.

Conversions that occur after a user sees (but doesn’t click) a display ad. Users convert through another channel (search, direct) within a defined lookback window (typically 1–30 days).

The average number of times a single user sees your ad within a defined period. Balances between sufficient exposure for recall and overexposure causing fatigue.

The total number of unique users who were exposed to your ad campaign within a defined period.

The cost for each fully completed video ad view. The standard efficiency metric for video advertising campaigns.

The measured increase in brand awareness, ad recall, consideration, or purchase intent attributable to an advertising campaign, determined through exposed vs. control group surveys.

Fill rate measures the percentage of available ad inventory that is successfully sold and filled with ads. Comparison between programmatic direct deals and open auction reveals revenue optimization opportunities.