Metrics and KPIs
Metrics are numbers that tell you how well your product is performing. KPIs (Key Performance Indicators) are the specific metrics that matter most for the product's success. Without metrics, a PM is flying blind. With the right metrics, every decision is grounded in evidence.
Why Metrics Matter
Imagine running a bakery with no sales data, no count of customers, and no idea which items are most popular. You would restock based on gut feeling and run out of the wrong things constantly. Product management without metrics works the same way.
Metrics turn opinions into facts. Instead of "I think users love this feature," a PM can say "78% of users who try this feature come back the next day."
The AARRR Framework (Pirate Metrics)
AARRR is a popular framework for thinking about product metrics across the full user journey. It was coined by investor Dave McClure and named "Pirate Metrics" because the acronym sounds like a pirate saying "Arrr!"
A — Acquisition: How do users find your product?
(e.g., website visits, app downloads, sign-ups)
↓
A — Activation: Do users have a good first experience?
(e.g., completed onboarding, first action taken)
↓
R — Retention: Do users come back after the first visit?
(e.g., Day 7 retention, weekly active users)
↓
R — Revenue: Do users pay for the product?
(e.g., conversion to paid, average revenue per user)
↓
R — Referral: Do users tell others about the product?
(e.g., Net Promoter Score, referral rate)
A PM picks 1–2 key metrics from each stage and tracks them weekly. Drops in any stage signal a specific problem to investigate.
The North Star Metric
Every product has one metric that best captures the core value it delivers to customers. This is called the North Star Metric. The entire team aligns around growing this single number.
Examples:
| Product | North Star Metric |
|---|---|
| Social media platform | Daily active users |
| Music streaming app | Total minutes listened per month |
| E-commerce platform | Number of successful purchases per week |
| Project management tool | Number of active projects per team per month |
| Learning app | Lessons completed per user per week |
The North Star Metric must reflect value delivered to the customer — not just revenue. Revenue follows when customers get real value.
Leading vs. Lagging Indicators
LAGGING INDICATORS (show what already happened): Revenue, customer churn, annual retention → Slow to change, hard to influence directly LEADING INDICATORS (predict what will happen): Daily logins, feature adoption, time-to-value → Change faster, easier to act on
PMs track both. Lagging indicators measure outcomes. Leading indicators signal whether the outcomes will improve.
Example: If users who complete onboarding in under 3 minutes have 3x higher 30-day retention, then "onboarding completion time" is a leading indicator for retention.
Common Product Metrics Explained
Daily Active Users (DAU) and Monthly Active Users (MAU)
These count how many unique users open and use the product in a day or a month. The DAU/MAU ratio shows engagement — if 100,000 people use your product monthly but only 5,000 use it daily, that ratio of 5% signals a habit problem.
Retention Rate
Retention rate measures the percentage of users who come back after a defined period. Day 1, Day 7, and Day 30 retention are the most common checkpoints.
If 100 users sign up on Monday: Day 1: 60 return → 60% Day-1 Retention Day 7: 30 return → 30% Day-7 Retention Day 30: 15 return → 15% Day-30 Retention
Churn Rate
Churn is the percentage of users who stop using the product in a given period. High churn means the product is not delivering enough ongoing value.
Net Promoter Score (NPS)
NPS measures customer loyalty. Ask users: "On a scale of 0–10, how likely are you to recommend this product to a friend?" Score 9–10 = Promoter. Score 7–8 = Passive. Score 0–6 = Detractor.
NPS = % Promoters − % Detractors
Vanity Metrics vs. Actionable Metrics
Vanity metrics look impressive but do not guide decisions. Actionable metrics connect directly to behavior you can change.
| Vanity Metric | Actionable Alternative |
|---|---|
| Total app downloads | % of downloads that activate in first session |
| Total users registered | Weekly active users |
| Page views | Task completion rate |
| Social media followers | Click-through rate from social to product |
Key Takeaway
Metrics transform product management from guesswork into a discipline. A PM who tracks the right metrics spots problems early, makes confident decisions, and communicates product health clearly to the entire organization. Focus on the metrics that connect directly to value for the customer and results for the business.