KPI (Key Performance Indicator)
Metrics & KPIsDefinition
A KPI (Key Performance Indicator) is a single metric chosen to measure progress against a specific business goal. The word key is the point: out of dozens of trackable numbers, a KPI is one you have decided actually drives a decision. Good KPIs are tied to outcomes like profit, leads, or retention, not just activity.
Every metric is a number, but not every number is a KPI. Clicks, impressions, and sessions are metrics. They tell you something happened. A KPI is the metric you have promised yourself to act on, the one that moves a real business goal. The discipline of marketing measurement is mostly the discipline of refusing to call everything a KPI.
The most common mistake is tracking too many KPIs. When a dashboard shows thirty headline numbers, none of them is key, because no one can act on all of them at once. Strong teams pick a small set, usually three to five per goal, and let everything else live as supporting context. A lead-gen account might run on cost per lead, lead-to-sale rate, and ROI, with click-through rate and quality score sitting one layer down as diagnostics.
KPIs also have to match the stage of the funnel and the person reading them. A media buyer cares about CPC and CTR because those are levers they can pull this afternoon. A managing director cares about CAC, ROI, and customer lifetime value because those decide whether the channel deserves more budget. A good reporting structure feeds each audience the KPIs they can actually act on, instead of one giant table that serves no one.
Finally, a KPI is only useful with a target attached. Cost per lead of 40 euros means nothing until you know whether your goal was 30 or 60. The target turns a number into a verdict, and the verdict is what triggers a decision to optimise, scale, or pause.
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Frequently Asked Questions
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Every KPI is a metric, but most metrics are not KPIs. A metric is any number you can track, like clicks or impressions. A KPI is the small set of metrics you have chosen to act on because they directly signal progress toward a business goal, each with a target attached.
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Usually three to five per goal. Beyond that, no single number stays key and the team loses focus. Keep a tight headline set, like cost per lead, lead-to-sale rate, and ROI for a lead-gen account, and let supporting metrics live one layer down as diagnostics.
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It depends on the goal. E-commerce often leads with ROAS, AOV, and customer lifetime value. Lead generation leans on cost per lead, lead quality, and ROI. The right KPIs are the ones tied to your specific outcome, not a universal list copied from another business.
Track the few KPIs that actually drive decisions
We cut through vanity metrics and build dashboards around the numbers that move your business, each with a target you can act on. Let us set up your KPI reporting.