Marketing KPIs and metrics: how to measure the return on communication investments

Measuring precisely the impact of every euro invested in communication and marketing is not always possible, but it is much more possible than many think, especially in digital. The problem is not a lack of data: in 2026, digital platforms produce more data than any team can process. The problem is the lack of a system that transforms data into decisions. This article helps build that system, starting from the fundamental distinction between metrics that matter and those that only create the illusion of mattering.

Vanity metrics vs. business metrics

The first distinction to make is between vanity metrics and business metrics. Vanity metrics are those that feel good but say nothing about the economic impact of marketing activities: followers, likes, impressions, page views taken alone and out of context. Business metrics are connected to the company's objectives: number of qualified leads generated, lead-to-customer conversion rate, customer acquisition cost (CAC), customer lifetime value (LTV), return on advertising spend (ROAS), sales increase attributable to specific campaigns. A good measurement system includes both channel metrics (which help optimise individual activities) and business metrics (which say whether marketing is actually contributing to company growth).

The attribution model: who gets credit for the conversion

Attribution is one of the most complex problems in marketing measurement. When a customer purchases after seeing a Google ad, an Instagram post and a newsletter, which channel 'made the sale'? The most common attribution models are: last click (all credit to the last channel touched before conversion), first click (all credit to the first channel), linear (credit distributed equally across all channels), data-driven (credit distributed based on statistical analysis of each touchpoint's impact). The last click model is the simplest but also the most misleading: it overestimates closing channels (such as branded Google search) and underestimates opening channels (such as display or social). Google Analytics 4 offers data-driven models that are generally more accurate and recommended as a starting point.

The fundamental KPIs for each type of marketing activity

The KPIs to monitor depend on the type of activity. For SEO and organic content: total and per-page organic traffic, average position of main keywords, click-through rate from SERPs, conversions from organic traffic. For paid campaigns: impressions, clicks, CTR, cost per click (CPC), conversions, cost per conversion (CPA), ROAS. For organic social media: reach, engagement rate, follower growth, site clicks. For email marketing: open rate, click rate, unsubscribe rate, email conversions. For the website: conversion rate, average time on site, bounce rate, pages per session. Each KPI should be read as a trend (is it improving or worsening compared to the previous period?) and not just as an absolute value.

How to build an effective marketing dashboard

A marketing dashboard is a synthesis tool that brings together the most important metrics in a readable format, updated regularly and usable by those who make decisions. Characteristics of a good dashboard: it shows the metrics that matter, not all available metrics (selection is the first valuable work); it is structured by objectives (objective 1: generate leads, relevant metrics; objective 2: build brand awareness, relevant metrics); it is updated at the appropriate frequency (weekly for paid campaigns, monthly for SEO and content); it includes the historical trend and comparison with the previous period. The most common tools: Google Looker Studio (free and integrable with all Google platforms), Databox, DashThis, or a simple manually updated spreadsheet for smaller organisations.

Marketing ROI: how to calculate it rigorously

Marketing ROI is calculated with the formula: (marketing-generated revenue minus marketing cost) divided by marketing cost, expressed as a percentage. The hard part is accurately measuring the generated revenue, because it requires a reliable conversion tracking and attribution system. In B2B, where the sales cycle is long, the concept of influenced pipeline is often used: how much revenue in pipeline was touched by marketing activities? In B2C, with shorter cycles, direct measurement is more accessible. A useful rule of thumb: in digital advertising, a ROAS of 3 or higher is generally considered positive for most sectors, although the profitability threshold always depends on the specific business margin.

Measuring marketing is not an ancillary activity done at month-end to justify the budget spent. It is the process that allows continuous learning, optimisation and improvement. Companies that have built a solid measurement system and use data to make decisions achieve better results with the same budgets compared to those working by intuition. Getting started does not require sophisticated technology: just choose five or six metrics truly relevant to business objectives, measure them regularly and use them to make concrete decisions every month. The next step is having the right expertise to interpret the data and act on it: an analytics specialist or growth marketer with real experience is worth more than any tool. Really Hub enables you to find exactly these professionals, building the marketing team that knows not just how to do — but how to measure, learn and improve.