Strategy
Startup Growth Metrics: What to Measure and When
Measuring the wrong metrics at the wrong stage wastes attention and creates false confidence. Here is the framework for choosing the right metrics for your current growth phase.
Early-stage founders often track metrics that look impressive but do not predict business health: page views, social followers, or total signups. The metrics that matter depend entirely on your stage. Pre-product-market-fit, you track engagement signals. Post-PMF, you track retention and revenue efficiency.
Pre-PMF metrics: finding the signal
Activation rate. What percentage of new signups complete your core use case within 7 days? Below 20% means your onboarding or your product-market fit needs work.
Retention at Day 30. Are users still active 30 days after signing up? This is the earliest signal of PMF. For SaaS, 30-day retention above 40% is a strong signal.
Sean Ellis score. Survey active users: "How would you feel if you could no longer use this product?" If 40%+ say "very disappointed," you have PMF. This is the simplest reliable test.
Organic referral rate. Are users telling others about your product without being asked? Unprompted referrals are the strongest PMF signal available.
Post-PMF metrics: scaling efficiency
MRR growth rate. Month-over-month revenue growth. For a seed-stage SaaS targeting venture scale, 15 to 20% monthly MRR growth is a strong benchmark.
Net Revenue Retention (NRR). The percentage of revenue retained from existing customers after churns, contractions, and expansions. Above 100% NRR means your existing customers are growing your revenue without new customer acquisition.
Customer Acquisition Cost (CAC) payback. How many months of revenue does it take to recover what you spent acquiring a customer? Under 12 months is sustainable for most B2B SaaS.
LTV:CAC ratio. The ratio of lifetime customer value to acquisition cost. Above 3:1 indicates a sustainable acquisition model.
Vanity metrics to avoid
- Total registered users (includes inactive and churned accounts).
- Website page views (does not correlate with conversion or retention).
- App store download count (does not account for activation or retention).
- Social media follower count (measures audience, not customers).
- Press coverage volume (measures awareness, not conversion).
Measure discovery channel performance the same way
Platform listings and directory submissions are acquisition channels — apply the same rigor to measuring their contribution: signups per platform, activation rates from each source, and retention by acquisition channel.