A Key Performance Indicator (KPI) is a quantifiable measure used to evaluate progress toward a specific business objective. KPIs translate strategy into numbers — the metrics that tell a team whether the work is moving the business in the intended direction. They're operational, time-bound, and tied to decisions, distinguishing them from general metrics that measure activity without measuring outcomes.
What separates a KPI from a metric
Every KPI is a metric; not every metric is a KPI. The distinguishing test:
- Tied to a strategic objective. KPIs measure progress toward something the business cares about. Metrics measure activity in general.
- Time-bound and target-bound. A KPI has a target ("reach 12% conversion rate by Q3"). A metric is a number being tracked.
- Drives decisions. If a KPI moves outside its target range, someone takes action. Metrics that don't change behavior aren't KPIs — they're dashboard wallpaper.
- Owned by a person or team. Every KPI has someone accountable for it. Metrics with no owner rarely improve.
What good ecommerce KPIs look like
- Conversion rate: percentage of sessions that convert. The headline performance metric for most ecommerce.
- AOV (Average Order Value): revenue per order. Lifts directly into revenue when conversion rate holds.
- CAC: total acquisition spend divided by new customers acquired.
- CLTV: projected gross profit from a customer across their relationship with the brand.
- LTV:CAC ratio: the relationship between lifetime value and acquisition cost. The single most informative ecommerce KPI.
- ROAS: revenue from ad spend divided by ad spend. Channel-level efficiency.
- Churn rate: percentage of customers lost over a defined period. Subscription-relevant; broadly useful for retention measurement.
- NPS: directional signal of customer perception. Useful as a trend tracker, weak as a forecast.
How to choose the right KPIs
- Tie each KPI to a specific objective. The list of "important metrics" is endless; the list that drives the current strategic objective is short. Most teams track too many.
- Limit the count. Five to seven primary KPIs at the company level, with department-level KPIs cascading from them. Twenty top-level KPIs means none are top.
- Match the time horizon. Some KPIs are weekly (revenue, conversion, sessions), some are monthly (CAC, AOV, retention cohorts), some are quarterly (CLTV, NPS, brand-level metrics). Different cadences for different decisions.
- Balance leading and lagging. Lagging KPIs (revenue, profit) tell you what happened. Leading KPIs (cart adds, email engagement, branded search volume) predict what's coming. A KPI portfolio needs both.
- Define what "good" looks like. A KPI without a target is just a number. The target may be a benchmark, a year-over-year improvement, or an aspirational goal — but it has to be defined.
Common KPI mistakes
- Tracking too many. Dashboards with 30 KPIs aren't dashboards — they're spreadsheets that nobody reads.
- Vanity metrics. Followers, page views, impressions. Easy to count, weakly correlated with business outcomes. Vanity metrics make the team feel productive without indicating progress.
- Optimising the metric, not the outcome. Teams that optimise hard for one KPI sometimes degrade adjacent metrics that matter more ("we hit the conversion-rate target by sending discount-heavy email, but blended margin dropped"). KPIs need to be evaluated as a portfolio.
- No accountability. KPIs without an owner stagnate. Every primary KPI should have a single accountable person, even if the work is cross-functional.
- Setting and forgetting. KPIs need quarterly review. Strategic priorities shift; the KPI set should shift with them.
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