What is a key performance indicator (KPI)?
A KPI is a metric that has been promoted. Out of everything a business or a campaign could measure, a KPI is one of the few chosen as the real signal of success, given a target and a deadline, and assigned to someone who answers for it. Revenue growth, customer retention, cost per acquisition, completed views, share of voice: any of these can be a KPI, depending on what the work is meant to achieve. The word key is doing real work: a KPI earns its place by being the number someone would change course for.
KPIs exist at every level. A company has KPIs for the year, marketing has KPIs that ladder up to them, and a single campaign has KPIs that ladder up to marketing's. The chain only works if each level is honestly connected to the one above it, so that hitting the campaign target actually moves the company target.
Why it matters
Why a KPI matters
KPIs turn ambition into something you can check. "Build the brand" is a wish; "raise unaided awareness among a defined audience by a set amount by the end of the year" is a commitment. Once the KPI is agreed, decisions get easier, because every option can be weighed against it, and the conversation after the campaign becomes a review of evidence rather than a debate about feelings.
The wrong KPI does real damage. Teams optimize for what they are measured on, so a campaign judged only on clicks will produce work designed to be clicked, whether or not it builds anything that lasts.
In practice
How a KPI works in practice
- 01
KPIs are set at the start, in the brief or the plan, with three parts: the metric, the target and the timeframe. Good ones pass the familiar test of being specific, measurable, achievable, relevant and time-bound. A campaign usually has one primary KPI that defines success and a few secondary ones that explain it. A launch film might be judged first on completed views among its target audience, with engagement and site traffic as supporting signals.
- 02
During and after the work, the KPIs are tracked from the relevant sources (ad platforms, analytics, sales data, brand surveys) and reviewed at agreed points. When a KPI is off track mid-campaign, the team adjusts the media mix, the cut or the targeting. After the campaign, the results feed straight into the next brief, which is the part most teams skip.
Watch out
What people get wrong about KPIs
Having too many. A dashboard of twenty KPIs has no key ones. The second mistake is choosing what is easy to measure instead of what matters, which is why so many brand campaigns are judged on impressions alone. The third is setting KPIs after the work has launched, when it is tempting to pick whichever numbers went up. And creative work often has effects no KPI captures: the film people still mention a year later rarely shows up in the first week's report. A fourth is treating the target as the goal. A KPI is a proxy for something the business wants, and when the proxy is hit by gaming it, nobody is better off.
