The KPIs That Actually Matter for Startup Growth
- Stephanie Roulic
- May 4
- 3 min read
At Startup Boston Week, founders packed into a session with one big question hanging in the air:
How do you know if your startup is truly healthy or just good at looking impressive online?
Anthony Franklin, Managing Principal at Spearhead Revenue Consulting and former startup revenue leader, offered a blunt warning: too many founders are chasing metrics that look exciting in pitch decks, LinkedIn posts, or casual investor conversations, but don’t actually reflect whether the business is working.
His message was simple: Vanity metrics can distract teams, erode trust, and steer startups toward the wrong priorities.
Why Vanity Metrics Are Dangerous
Metrics like total followers, press mentions, signups, daily active users, or even ARR can sound impressive in isolation. But Franklin argued that if those numbers aren’t tied to retention, revenue, or real customer value, they can create a false sense of momentum.
A company may be growing traffic while losing customers. Another may announce rising ARR while spending unsustainably to get there.
The issue isn’t that these metrics are useless, it’s when they become the headline story.
As Franklin explained, teams naturally rally around whatever numbers leadership puts in front of them. If the wrong metric becomes the goal, the business can end up optimizing for appearances instead of outcomes.
The Four KPIs Every Founder Should Track
Instead of vanity metrics, Franklin urged founders to focus on four core KPIs that reveal the real health of a startup.
1. Customer Acquisition Cost (CAC)
CAC measures how much it costs to acquire a new customer.
That means fully loaded sales and marketing expenses - including salaries, commissions, ad spend, software tools, agencies, and related costs - divided by the number of new customers acquired during that time period.
Why it matters: if customer acquisition costs rise faster than revenue, growth can quickly become unsustainable.
2. Churn Rate
Churn measures how quickly customers leave.
For early-stage startups, Franklin called churn one of the most important indicators of all. If customers are leaving rapidly, it often signals weak onboarding, unclear value, poor product-market fit, or attracting the wrong audience.
His warning to founders: if your bucket is leaking, pouring more customers in won’t solve the problem.
3. Customer Lifetime Value (LTV)
LTV estimates how much revenue or profit a customer generates over the course of the relationship.
Higher lifetime value often means customers stay longer, buy more, and see greater value in the product.
This metric becomes especially powerful when paired with CAC. If it costs $5,000 to win a customer worth $2,000, something has to change.
4. Burn Rate
Burn rate tracks how much cash a startup is spending each month.
For venture-backed startups, burn rate determines runway (e.g. how long the company can keep operating before needing additional revenue or funding).
Franklin noted that profitable bootstrapped companies may prioritize other metrics more heavily, but for many startups, burn remains essential.
The Power of a North Star Metric
Beyond those four KPIs, Franklin encouraged founders to define one North Star Metric - a single number that best predicts long-term growth.
Examples included:
Facebook: users connecting with seven friends in ten days
Airbnb: nights booked
Slack: 2,000 messages per team per week
The right North Star metric should be:
Tied to customer value
Predictive of growth
Easy for the whole team to understand
Hard to game
Influenced across departments
When chosen well, it gives the entire company one clear direction.
Dashboards Should Show Trends, Not Theater
Franklin also challenged how startups present metrics internally and to investors.
Too many dashboards are cluttered, overloaded, and full of feel-good numbers. Instead, he recommended dashboards that:
Put the North Star metric front and center
Highlight trends over time
Use a clear hierarchy
Show supporting operational metrics below core KPIs
Eliminate vanity headlines
His view: investors and teams don’t need a prettier dashboard, they need one that tells the truth.
Final Takeaway
The startup graveyard is full of smart founders who optimized the wrong numbers.
Real growth rarely comes from chasing attention. It comes from understanding unit economics, keeping customers, improving value, and aligning teams around metrics that matter.
As Franklin put it: Measure what matters. Kill what distracts.
